service manual neutec sm1645

SM- 1 645 SERIES SYNTHESIZED MOBILE RADIOS January 1987

CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I

Location of Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EPROM Programming 3

Circuit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Parts Variation vs . Frequency Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Alignment and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Suggested Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

PC Board Layouts and Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

SM-1645 Series Mobiles and Mobile Repeater

This Equipment Meets or Exceeds the Following Specifications

General SM-1645H SM-1645L SM-1645HS

Transmitter

Weight

144 - 174 MHz

16

12 MHz - 30 to + 60C

13.8 VDC

9.1 amps

.98 amps

50 ohms

5 PPM

Dual EPROMS

5 or 1 2.5 KHz

1 1.7 x 7.2 x 2.6 inches

Frequency Range

Channels

Frequency Spread

Operating Temperature

Operating Voltage

Current Drain (TX)

Current Drain (RX)

Antenna Impedance

Frequency Stability

Programming

Channel Spacing

Size

4 Ibs. 2 02s.

\

Specifications subject to change without notice.

136 - 1 74 MHz

16

12 MHz

- 30 to + 60C

13.8 W C

8.5 amps

.8 amps

50 ohms

5 PPM

EPROM

5 or 12.5 KHz

7.2 x 2.6 x 10 inches

RF Output Power

Modulation

Spurious and Harmonics

Hum and Noise

Audio Distortion

30 - 50 MHz

16

2.5 MHz

- 30 to + 60C

13.8 VDC

9.0 amps

.8 amps

50 ohms

5 PPM

EPROM

5 or 12.5 KHz

7.2 x 2.6 x 10 inches

4 Ibs. 2 02s.

45 Watts (adj. 10-50)

16-

- 80 dB

- 50 dB

3%

45 Watts (adj. 10 - 50)

16-

- 80 dB

- 50 dB

3%

.25 u V ( 12 dB SINADJ

- 85 dB

- 85 dB

- 75 dB

- 50 dB

5 Watts

5 Ibs 4 02s.

35 (adj.)

16B

- 80 dB

- 50 dB

3%

.25 u V ( 12 dB SINAD)

- 85 dB

- 85 dB

- 75 dB

- 50 dB

5 Watts

Sensitivity

Selectivity

Image and Spurious

Intermodulation Rejection

Hum and Noise

Audio Output

.25 UV ( 12 dB SINAD)

- 85 dB

- 85 dB

- 75 dB

- 50 dB

5 Watts

LOCATION OF CONTROLS

"Transmit" Indicator "Busy" lndlcator

1 pOwerswitchonloff~

Squelch Control and Scanned Channels Designator

Microphone Receptacle (with Scan Option) Channel Select

OPERATING PROCEDURE 1. Turn the "Volume Control" clockwise to apply 5. When the channel is clear (background noise

power. The channel indicator will illuminate. only), rotate the "Squelch Control" clockwise 2. Set the "Channel Select" switch to the desired until the receiver is silenced. Perform this step

channel, as shown in the "Channel Indicator" carefully. Do not go far beyond the silencing point window. or the receiver may not respond to weak signals.

3. Rotate the "Squelch Control'' counterclockwise. 6. After setting the receiver controls and seleaing , 4. Adjust the "Volume Control" for a normal the proper channel, depress the microphone push

listening level (background noise or a station if tatalk switch and speak across the face of the one is transmitting). microphone in a normal voice when transmitting. ,

PRIORITY SCAN INSTRUCTIONS 1. Turn the radio on. 6. Activate the scan mode by depressing the "Scan" 2. Select through the channels and use the "Delete/ switch. A t this time the channel display will

Add" switch (detent of squelch pot) to delete indicate scanning of the channels in the scan list those channels that are to be skipped during the scan sequence. As channels are deleted the tone 7. Verify the priority monitor by opening "Squelch" light will extinguish. on a non-priority channel and noticing the "look-

3. Set the "Squelch Control" to quiet the receiver. back" action to priority channel. (This should be set on a non-active channel.)

4. Set the "Channel Selector" to the channel that is 8. Reset the "Squelch" to threshold. to be the priority channel.

5. Engage the priority monitor by depressing the 9. Remove the microphone from i tS bracket to assure "Prioriv' switch. (This step should only be priority channel switching. included if the priority channel is to be monitored at all times.) 10. Replace the microphone.

-2 -

General Transmit and receive frequencies are determined from binary information stored in the EPROM, IC703. If the MT-20 Multi Tone option is installed, CTCSS Encode and Decode frequencies are also derived from binary information stored in the same EPROM. Data fcr each channel consists of 1 6 bytes or memory locations. The first 8 bytes control receive frequency and tone and the second block of 8 bytes control transmit frequency and tone. Each byte or memory location stores 8 bits of data. The upper four bits are tone information and the lower four bits are frequem cy information. If no CTCSS Encode or Decode is programmed, then the upper four bits of each memory location will remain all ones, or, as represented in Hex. "F." The transmit or receive frequency data is strobed into the synthesizer in eight -four bit blocks, via four data lines from the EPROM. This data sets the counters internal to the synthesizer so that the appropriate VCO oscillates at the desired frequency. The addresses of the data to be sent to the synthesizer are obtained from the Channel Select switch and the TX/RX mode input to the EPROM.

Computation of ROM Data: Counter data can be determined mathematically using the formulas shown below. The result of the computations will consist of 8 figures in Hex format for each transmit or receive frequency. The following example for channel 1 is based on a simplex frequency of 154.430 MHz without CTCSS. Note that the receive Hex code is computed for 2 1.6 MHz below the desired receive frequency. For l o w band radios 2 1.6 MHz will be added to the receive frequency instead of subtracted. The eight data values for each transmit or receive frequency will be labeled DO thru D7 and shown in Hex. RECEIVER DATA: VCO freq: 154.430 - 2 1.6 = 132.83 MHz

N = ( 1 32.830 x 1000j / 5 = 26566 (5 being the channel spacing) 26566 / 10240 = 2.5943359375 (*) W = lnteger value of above D4 = 2. Multiply figures to the right of the decimal by 16. .5943359375 x 16 = 9.509375 (*) D3 = lnteger value of above D3 = 9 Again multiply fractionary remainder by 16. ,509375 x 16 = 8.15 D2 = 8 Multiply fractionary remainder by 2.5 .I50 x 2.5 = 0.375 D l = 0 Multiply fractionary remainder by 16. .375 x 16 = 6.0 DO = nearest whole number (if a fraction) which in

th is case is 6 DO=6

So far we have values for DO thru W. The values for D5 thru D7 are determined by the channel spacing.

Spacing can be 5 kHz (most U.S. frequencies) or 6.25 kHz spacing (mostly European). This is determined by whether the frequency is divisible by 5 or 6.25.

For 5 kHz steps: M = O D 6 = C D7=3

For 6.25 kHz steps: DS=O D6=O D7=3

The complete data load for 154.430 MHz (RXJ then is: DO=6, D l =0, D2=8, D3=9, W = 2 , D5=0, D6=C,C7=3or (6 0 8 9 2 0 C 3 )

TRANSMllTER DATA: VCO freq: 154.430

N=f154.430x10001/5=30866 .

(5 being the channel spacing) 30866 / 10240 = 3.0 162 109375 (*) W = 3 .0162 109375 x 16 = .259375 (*) D3 = 0 .259375 x 16 = 4.15 D2 = 4 .15 x 2.5 = .375 D l = 0 .375 x 16 = 6.0 DO=6

As before, channel spacing being 5 kHz, then: D5 = 0, D6 = C, D7 = 3

The complete data load for 1 54.430 MHz TX then is: DO=6, D l =O, D2=4, D3=O, W=3, D5=0, D6=C,D7=3or (6 0 4 0 3 0 C 3)

It must be remembered that in the hexadecimal sys- tem, numbers between 1 0 and 1 5 are represented by the letters A thru F. If we were to program 154.430 TX/RX into channel 1, the complete data load for the first 16 addresses of the EPROM would then be: F 6 m F 8 W R , m F C R , f i F O F 4 K ) n , H > F C n Note that the upper 4 bits of each byte at each address will be filled with one's (F), as they are unused by the synthesizer. Also, the RX data is always entered first

EXAMPLE DATA CHART EPROM ADDRESS DATA LOAD FUNCTION REMARKS

00 Do F6 qRX)=I 54.430 MHz 0 1 Dl FO qVCO)= 154.430-2 1.6 02 DZ F8 = 132.830 MH7 03 D3 F9 04 W R CHI 05 D5 FO RX 06 D6 FC 07 D7 I3

DO F6 F(TX)= 154.430 MHz Dl FO F(VCO]= 154.430 D2 F4 D3 FO w n CHI D5 FO TX

FC 137 n

('1 The dwision of N by 10240 and subsequent multiplication of the fractional pan by 16 should be done by hand or computer with appropriate accuracy as these numbers can sometimes extend 12 decimal places and must be carried rather than rounded off so as to maintain accuracy.

-3-

CIRCUIT DESCRIPTION RECEIVER

General 1st Local Oscillator The SM-1645's double superheterodyne design em- See "PLL/Frequency Generation". phasizes high sensitivity, low noise level and excellent selectivity. The first IF frequenq is 21.5 MHz and the

2nd second IF frequency is 455 kHz. 0105 is a crystal-controlled oscillator at 21.145 MHz,

RF Amplifler A low-noise, dual-gate FET (0101) amplifies low-level signals from the antenna terminal and feeds the next stage (1st Mixer). RF coils L101-L105 affect the band- width, filter incoming signals and prevent undesirable radiation of the 1st local oscillator frequency.

1st Mixer This function, performed by 0102, serves to mix the incoming signal and that of the 1st local oscillator, resulting in the 1st IF of 21.6 MHz. This stage is important in achieving a high level of intermodulation rejection.

with the frequency fine adjusted by CVIOI. This signal , is fed into the 2nd mixer (0106).

Squelch Control Circuit In a noise squelch circuit, the internal noise of the receiver decreases when a signal is present. When there is no incoming signal, noise is picked up and amplified by half of IC102 and part of IC103. It is then rectified by 0107 and converted to a DC level.

The DC signal is fed to a Schmitt Trigger Circuir (comprised of the other parts of IC103), which stops the amplification function of lClO2 (DC-Controlled Attenuator).

When there is incoming signal, and the internal noise decreases, the Noise Detector (0107) loses its output

1st IF Amplifler and pin 10 of IC103 goes high, enabling IC102. The

This circuit, consisting of 0104, amplifies the 21.6 MHz squelch point is controlled by the squelch potenri-

signal. ometer, which varies the gain of lClO2 at the DC level.

2nd Mlxer Busy Llght This function, performed by 0106, serves to mix the Where tone squelch systems are incorporated into frequency of the 2nd local oscillator, and to convert the radio, it is necessary to check for other signals 21.6 MHz to the 2nd IF of 455 Khz. before transmitting. The busy light indicator serves

that purpose.

2nd IF Amplifier The busy light functions off the high or low DC level

This staqe, contained within IC101, amplifies the 455 at pin 10 of IC103 via LED driver transistor 0108. d

KHz 2nd IF. It also performs the limiting function.

Regulated Power Supply Audlo Detector To keep fluctuations in power source voltage from This circ~it, consisting of IC 10 1 and F103, recovers the influencing the receiver characteristics, IC105 feeds audio signal from the 2nd IF. regulated voltage to the primary circuits, including

oscillator, squelch, RF amplifier and IF amplifier.

AF Amplifler IC104 amplifies the audio signal from the previous Switching Clrcult stage to the power level needed to drive the loud In the TX mode, the receiver supply voltage is removed speaker. by 0109-0110 and 0105-0106.

CIRCUIT DES CRlPTlON TRANSMIITER

General The oscillator uses a programmable Phase Locked Loop (PLL). The resultant VCO frequency is the same as the channel frequency on transmit and 21.6 MHz below channel frequency on receive. In the transmit mode, the VCO output is modulated, amplified and fed to the antenna.

PLL, Exciter Boards The circuits that make up the transmitter are:

PLL Transmitter Exciter Modulator Power Supply

PLL/Frequency Generation Transmitter drive at the carrier frequency and the receiver 1st local oscillator signal (21.6 MHz below the desired receive frequency) are generated respec- tively by independent VCOs 0203 and 0201. The signal from transmit VCO 0203 is buffered by 0204 before being fed to the TX exciter and PLL buffer 0205. The output from receive VCO 0201 is buffered by 0202 before being fed to the receiver 1st mixer. In the receive mode, 0201 output is also fed to the PLL buffer 0205 via 0204.

The frequency of the respective VCOs are controlled by a DC voltage derived by the PLL circuitry. The DC voltage results from a phase/frequency comparison between the divided-down frequency from the reference oscillator controlled by 4.8 MHz crystal X2Ol and the divided-down output from the VCO. These functions are performed by the dual-modulus synthesizer l C202.

XTAL heaters R267 and R268 stabilize the temperature of the reference oscillator. The heating is controlled by 0214 and 0215, and is proportional to the ambient temperature as sensed by the thermistor TH201. The resultant VCO control voltage (and hence frequency) is determined by the divide ratio of the counters internal to IC202. The VCO voltage will vary between 1.5 volts at the lowest frequency and 7.5 volts at the highest. This voltage is generated by

0206,0207 and 0208 based on phase data from the synthesizer IC202. Digital data, which sets the internal counters (or divide-by ratios) i n ICZOZ, is stored in an Erasable Programmable Read-Only Memory (EPROM) IC203.

The synthesizer, IC202, requires 32 bits for frequency determination. Data is transferred or "strobed" into IC202 in eight 4-bit "words" in order to simplify interconnection and package size. Strobing is done by clocking the addresses to the EPROM and IC202. The data entering lUO2 via data pins DO-D3 is stored in internal latches as determined by the address present.

Address strobing is accomplished by clock IC205, which drives counter lC204. IC204 converts the serial clock pulses from IC205 to 3-line binary addresses between 0 and 7 (decimal) at outputs 00-02.

PLL unlock protection is provided by 0212 and 0213. This circuit will disable the TX exciter in the absence of lock detect at IC202. A high or "1" is supplied to EPROM IC203 address line 3 (pin 5) during TX in order to switch strobing up by eight addresses. This allows receive data to be stored in the first 8 addresses and transmit data within the next 8 addresses of any given 16 address "channel block" selected by the channel select circuitry. Channel select addressing takes place at address lines A4-A7 of the EPROM.

It is conceivable that up to eight 16-channel blocks could be addressed via unused lines A8-A10 for a total of 128 channels.

(The 2716 EPROM stores up to 2048 bytes. Each channel requires 16 bytes, which provides room for 128 16-byte "groups".)

lC2Ol is a dual modulus counter controlled by IC202. The dual modulus method simplifies overall design by providing a selected division ratio on the input of IC202.

Operating frequency versus VCO voltage is determined by Varicaps D2OI-D2O2 at the receive VCO and D203-D204 at the transmit VCO. Modulation of the transmit VCO is determined by applying the audio signal to Varicap D205.

Transmitter Exciter 0209, 0 2 10 and 0 2 1 1 amplify the transmitter VCO signal to a suitable input level for the driver stage (0.5 W). The stages are broadband transformer coupled and do not require tuning.

Modulator This stage consists of Dual Op-Amp IC207. One half acts half as a speech amplifier and the other half provides pre- emphasis and limiting. Appropriate high frequency roll off is accomplished by a low-pass filter on the output of the second stage. Microphone sensitivity is set byVR2O 1 and deviation by VR202.

Power Circuits TX/RX switching is accomplished b y 0 2 1 7 and 0 2 16. In the receive mode, 0 2 1 7 saturates as a result of base drive from 8 V regular IC206. Saturation of 0 2 17 provides a ground path for RX VCO 0 2 0 1, thereby enabling it.

Shortening the PlT line to ground shunts base drive to 0 2 1 7, w5ich prevents it from conducting. This, in turn, disables RX VCO 0 2 0 I . In this condition, base current flows through 0 2 16, causing it to saturate and to pro- vide +8 V DC to the modulator, TX VCO and RFpredriver 0209 via 021 3, which is part of the lock detection circuit.

Voltage regulation is provided by IC208 (+ 5 V DC for the logic) and IC206 (+8 V DC for modulator and TX v c o j .

Display Board A 7-segment 2digit LED is used to display the channel being used. Four additional LEDs serve to indicate various functions of the radio.

The channel select switch sends out positive logic 4-bit binarycodes representing 0 to 1 5 decimal. To convert this to 1 to 16, " 1 " is added to the 4-bit code output by 4-bit parallel full adder lC6O 1.

IC602 converts the 5-bit binary code from the adder to 2-digit BCD for the display. The upper digits are 0 to 1, with 1 indicating Ch. 1 0 to Ch. 16. The 1 -bit output of the upper digits is connected to 0 6 0 1, which drives the segment that corresponds to "1 " on the first digit of the 7-segment display.

BCD codes for the lower digits are connected to IC602, which drives the second digit of the 7-segment display.

The +-bit codes from the channel select switch are also fed to the EPROM on the synthesizer board.

CIRCUIT DESCRIPTION ADDITIONAL RECEIVER P LL/REPEATER CONTROL PCB

(SCHEMATIC ON PAGE 4 1 )

SM-l645HS Duplex Mobile Repeater

The receiver PLL PCB has two functions. It must 3 line binaryform, is provided by counter IC 704 which separate the first local oscillator siqnal for the receiver is driven by free running clock consisting IC 705. independently of the transmitter ~ C O so as to allow me Rx PLi PCB contains additional circuitry which Operation* and it Conuo's Operation Of the controls if the is to operate in the duplex mode or transceiver in the duplex mode or as a repeater. repeater mode, and also provides an audio path

The VCO/synthesizer circuitry is identical to the transmitter VCO/synthesizer which was previously described and which is contained within the exciter PCB. In the receiver PLL section ,the VCO function is performed by 0 7 0 1. The output of 0 7 0 1, which is 2 1.6 MHz below the desired carrier (channel) frequency, is fed to buffers 0703 and Q702. The output of 0703 is fed to the Rx first mixer on the Rx PCB. The output of 0702 is fed to PLL buffer 0704. The output of 0704 is fed to IC 701. IC 701 is proqrammable

between the Tx and Rx when in the repeat mode. Control is accomplished by IC 706 and IC 707. Repeater/duplex selection is determined by the level of J70 1 pin 9. A high at this point selects repeater while a low selects duplex Q 708 provides audio feed to the Tx by amplifying and de-emphasizing the Rx discriminator signal from the Rx PCB. Deviation in the repeat mode is controlled by VR 70 1, audio path from the microphone (duplex mode) or the Rx PCB (repeater mode) is selected by analog switches in IC 708.

N/N+ I variable modulus counter whose countins Tx activation in the repeater mode is controlled by the ratio is controlled by synthesizer IC 702. The output of squelch level from the Rx PCB ( COR). Additional IC 702 is used to control the VCO as determined by the circuits on the PLL PCB are voltage regulation as binary data loaded into receive EPROM IC 703. The provided by IC 708, IC 709. Reference oscillator xtal binary data in IC 703 is clocked into the internal X 70 1 is temperature stabilized by proportional heater counters of the synthsizer IC. Prom addressing data, in circuit consisting of Q 7 1 0 and O 7 1 1.

MT-10 CTCSS SINGLE TONE ENCODE/DECODE OPTION

(SCHEMATIC ON PAGE 43)

General Theory MT- I 0 Interconnect Table: Neutec's MT-10 Single Tone option equips the Pin: Function: Destination: SM- 1 645 series of mobile radios for operation in CTCSS ~ 9 0 environments. With this option, the radio can encode I Grounding junction at or decode any of the 38 EIA standard tones. Program volume po t ming of tone information is accomplished via dip +5 VDC switches. MT-10 Single Tone option can not be used

+5 VCD output from PLL

with SC- 1 0 Scan Option Bd. (P2027)

Input/Output Functions: DECODE ENABLE [J901-4) - This input disables the audio gate on carrier channels until a carrier signal is detected. For tone channels, this input is ignored and audio is allowed to pass only after the proper tone is detected. MONl TOR ENABLE (J90 1 -6) - When the microphone is removed from its bracket this input is removed from ground. This opens the audio gate, allowing the selected channel to be monitored for activity. TX TONE OUT (J90 1 -7) - The programmed CTCSS tone is sent to the exciter via this output (Adjustment allows for proper deviation control.) TX ENABLE (J901-8) - This input provides transmit enable to the tone chip. This will cause the tone signal to be sent to the transmitter circuitry.

3 Audio In Receiver Bd. Detector (PI 02- 1 j Pin closest to front of unit

4 Decode Enable Receiver Bd. Sq. Detect (IC103-10) -

5 Audio Out Receiver Bd. Audio Amp (PI 02-2) Pin farthest from front of unit

6 Monitor Enable Mic Hook-Switch

7 TX Tone Out PLIJExciter Bd. (VR202 wiper) *

Tone Programming: 8 TX Enable Solder to gray wire on

Tone selection is accomplished by setting the dip switches on the Tone Board as indicated in Tone Data

J40 1 of driver board ( PF).

Table.

Installation: 1. A wiring harness for scan and tone options is

incorporated in Neutec mobiles to facilitate field installation or exchange.

2. Locate and secure MT- I 0 Tone Board in the space provided next to the internal speaker, on top side of radio.

3. Remove green jumper from Receiver Board J102 and connect two pin plug from wiring harness.

4. Connect eight pin plug from wiring harness toJ90 1 of MT- I 0 Tone Board.

5. On bottom side of radio, connect four pin plug from wiring harness to four pin plug provided. Solder opposite end of wire to J40 1 pin 4 on Driver Board.

Alignment: TX TONE LEVEL (R7) - With the transmitter keyed on a tone channel, adjust R7 for proper sub-audible deviation of the transmitter signal. .[Typically +SO0 Hz deviation. j

MT- I0 Single Tone CTCSS Installation Diagram: TOP VIEW

J90 1 I Ground, Blk 2 + 5 VDC, Red 3 Audio In, Grn 4 Decode Enable. Brn 5 Audio Out Org 6 Monitor, Yel 7 TXTone Out VL

8* TX Enable, Blue

Tone Data Table: TONE FREO.

TONE # 1 Hz) 1 67.0 2 71.9 3 74.4 4 77.0 5 79.7 6 82.5 7 85.4 8 88.5 9 91.5

10 94.8 1 1 97.4 12 100.0 13 103.5 14 107.2 15 110.9 16 1 14.8 17 1 18.8 18 123.0

DATA D2 D3

1 1 1 1 1 1 1 1 1 1 1 1 I 1 1 1 0 1 1 1 0 1 1 1 1 1 1 I 0 1 0 1 0 1 0 1

156.7 0 1 1 0 1 0 162.2 0 1 1 0 0 0 167.9 1 0 1 0 1 0 173.8 1 0 1 0 0 0 179.9 0 0 1 0 1 0 186.2 0 0 1 0 0 0 192.8 1 l 0 0 1 0 203.5 1 1 0 0 0 0 210.7 0 1 0 0 1 0 218.1 0 1 0 0 0 0 225.7 1 0 0 0 1 0 233.6 1 0 0 0 0 0 241.8 0 0 0 0 1 0 250.3 0 0 0 0 0 0

*NOTE: 1 = OFF 0 = O N

General Theory Neutec's MT-20 MultiTone option equips the SM- 1 645 series of mobile radios for operation in CTCSS environments. With this option, the radio can encode or decode any of the 38 EIA standard tonel Tone information is stored in the single EPROM; along with frequency data. Any given channel can be p r o grammed to encode the transmitter, decode incoming signals for proper tone, or operate in a carrier squelch mode. This universal capability enhances the versatile features of the Neutec product line.

Input/Output Functions: DECODE ENABLE (J90 1-4) - This input disables the audio gate on carrier channels until a carrier signal is detected. For tone channels, this input is ignored and audio is allowed to pass only after the proper tone is detected. MONITOR ENABLE (J901-6) - When the microphone is removed from its bracket this input is removed from ground. This opens the audio gate, allowing the selected channel to be monitored for activity. TX TONE OUT (J901-7) - The programmed CTCSS tone is sent to the exciter via this output (Adjustment allows for proper deviation control.) TONE DECODE OUT (J901-8) - This output is only used on radios equipped with the SC- 10, Priority Scan Option. When used, this output causes the scanner to halt when the proper tone is detected. TONE CHANNEL (J902- 1 j - This output is only used on radios equipped with the SC-1 0, Priority Scan Option. When used, this output informs the Scan Board that a tone channel has been selected. The Scan Board then extends the sample time to allow for sufficient decode time.

DATA IN (J902-2) - Incoming memory data from the EPROM is input to the Tone Board at this point The serial data is then latched and fed to the tone chip in a parallel fashion. This data acquaints the tone processor with the programmed tone and options that have been selected. WRITE DISABLE (J902-3) - Data is allowed to enter into the Tone Board only during periods when the write disable line is in the low state. This action allows the serial data to be clocked into the Tone Board for instruction processing. AO - AZ (1902-4, 5, 6) - These inputs to the Tone Board set-up the proper addressing of incoming data.

eight bits of data. The upper four bits are tone information and the lower four bits are frequency information. When loading an EPROM with the Stand Alone programmer, obtain data DO thru DS from the Tone Data Table. Obtain data D6 and D7 from the Tone Function Table below.

Tone Function Table: Rx Tx

Mode D6 0 7 W D7 Rx Decode Only 0 F 0 F Tx Encode Only F F F 0 Carrier Squelch F F F F

0 F 0 0 Encode & Decode The following example for channel 1 is based on a simplex frequency of 154.350 MHz with a CTCSS Encode and Decode tone of 67.0 MHz.

From the Tone Data Table DO-DS are as follows: DO=l D l = l D2=1 D3=1 D4=1 D5=1

From the Tone Function Table, receive values are: D6=O D 7 = F

Also from the Tone Function Table, transmit values are:

D6=O D 7 = 0 The complete example data appears below.

EXAMPLE DATA CHART EPROM ADDRESS DATA LOAD FUNCTION REMARKS

00 DO 16 01 Dl 10 02 D2 18 03 03 19 04 W 12 CH I 05 DS 10 Rx 06 D6 OC 07 0 7 R

08 W 16 09 Dl 10 0 A D2 14 OB D3 10 OC W 13 CH 1 OD D5 10 . Tx OE D6 OC OF D7 03

(Tone lnformatim Freq. Informadon)

Installation: 1. A wiring harness for Scan and Tone Options is

incorporated in Neutec mobiles to facilitate field installation or exchange.

2. Locate and secure MT-20 Tone Board in the space provided next to the internal speaker on top side of radio.

Tone Programming: CTCSS Encode and Decode information is stored in 3. Remove green jumper from Receiver Board J1 O2

EPROM IC203. on the PLL Board. Each channel and connect two pin plug from wiring harness. assignment consists of 16 bytes or memory locations. 4. Connect wiring harness eight pin plug to J90 1 of The first eight bytes are for receive and the second MT-20 Tone Board. Connect wiring harness six pin block of eight bytes are for transmit Each byte contains

-8- plug to J902 of MT-20 Tone Board.

MT-20 CTCfS MULTITONE ENCODE/DECODE OPTION

MT-20 Interconnect Table: MT-20 Multitone Option Installation Diagram: Pin: Function: Destination: J90 1

1 Ground Grounding junction at volume p o t

2 4-5 VDC f 5 VDC output from PLL Bd. (P202-7)

3 Audio In Receiver Ed. Detector . (PI 02- 1 ) Pin closest to front of unit

4 Decode Enable Receiver Bd. Sq. Detect (IC103-10)

Tone Channel Data In Write Disable A0 A1 AZ

TOP VIEW

I J90 1 1 Ground 2 +5VDC 3 Audio Iln 4 Decode Enable 5 Audio Out 6 Monitor 7 TX Tone Out 8 DecodeOut

5 Audio Out Receiver Bd. Audio Amp Alignment: (PI 02-2) Pin farthest from TX TONE LEVEL(R7) - With the transmitter keyed on front of unit a tone channel, adjust R7 for proper sub-audible

6 Monitor Enable Mic Hook-Switch. deviation of the transmitter signal. (Typically + 500 Hz deviation.)

7 TX Tone Out PLwExciter Bd. (VR202 wiper) *

8 Tone Decode Scan Bd. (J803-2) Out Only used with Scan

Board option.

J902 1 Tone Channel Scan Bd. (J803-3)

Only used with Scan Board option.

2 Data In PLL Bd. (J205-1) 3 Write Disable PLL Bd. CKl (J203-2) 4 A0 PLL Bd. EPROM (1QO3-8)

5 A1 PLL Bd. EPROM (IQ03-7)

6 A2 PLL Bd. EPROM (lC203-6)

SC-10 PRIORITY SCANNER OITION (SCHEMATIC ON PAGE 47)

General Theory The SC- 1 0 Priority Scanner Option for the SM- 1 645 Series of mobile radios allows scanning of all, or any portion of, programmed channels. Designed to offer simple, effective operation, the SC- I option will aute matically stop scanning whenever activity is detected on an enabled channel.

Channels are enabled in two methods. First the initial scan list length is established by a jumper on the scan board. This jumper may be installed to establish a scanning list for 2 to 16 channels. Secondly, once the scan list is set the user can delete/add channels via a switch on the front panel. Addition or detection of a channel is accomplished by turning the squelch control in to and out of the CH IN/OUT position. the CH/IN light indicates whether the channel is in the scan list.

Priority channel monitoring is accomplised by activb tion of the priority on/off push button. this feature assures that the priority channel is always monitored - even during activity on non-priority channels. A "priority-check" monitor constantly samples the priority channel to detect activity. If activity is detected, the scanner will immediately revert to the priority channel and maintain that channel until activity is concluded.

Input/Output Functions: DO - D3 INPUTS - Channel selection is input to the scan board at U2. When the scan option is disabled the input data is passed to the output via the data bus. When the scan mode is engaged the data is clocked to artificially advance the channel selection. Whenever the priority channel monitor detects activity on the priority channel, U2 again passes the direct data information as output to the display and synthesizer boards.

61T 0 -' BiT 3 OUTPUTS - These outputs control the display logic and synthesizer. 'When the scan mode is off, these outputs fallow the DO - D3 inputs. Upon scan activation, these outputs are artificially advanced by the scan clock circuitry.

CH/IN LIGHT OUTPUT - To indicate scan list selection the tone light is illuminated on channels that have been selected active. As channels are deleted the tone light is extinguished.

SCAN ON/OFF INPUT- The "Scan" switch applies a ground to the scan enable input This enables the scan mode and allows U2 to pass the clocked artificial channel data.

PRIORI7Y ON/OFF INPUT - When the "Priorit)/' switch is closed the priority monitor is enabled. During priority monitor condition U2 periodically reverts to manual mode to allow the synthesizer to momentarily lock-on to the priority channel. If activity is detected the scan sequence is halted until activity concludes. If the priority channel is inactive, the scan sequence resumes at the previous channel.

CARRIER INPUT - The not carrier input enables the , scan clock oscillator. When a carrier is detected this line is forced low causing the scan clock to be disabled. The scan sequence will then continue when the carrier is . removed.

TONE CHANNEL INPUT - The not tone line is input from the tone board (TS-2). This line is forced low whenever a tone channel is scanned. When a tone channel is scanned (and a carrier is present) the scan cycle time is increased to allow sufficient time for the tone board to detect tone information. If the proper tone is detected by the tone board, the scan sequence is halted until the tone is removed. (When this input is unused the line should be connected to 4-5 volts.)

DECODE INPUT - When the tone board detects the proper CTCSS tone, the not decode line is forced low. This disables the scan sequence until the tone is removed.

DELETE/ADD SWITCH - This input is momentarily grounded to toggle the selected channel in or out of the scan list

Scan List Length Programming: The SC-1 can be programmed to scan from 2 to 16 channels. Programming is accomplished by installing . jumper J1. Install thejumper to the program point and the position which directly corresponds to the maximum desired channel number.

PROGRAM 12 IS 14 9 8 1 1 10 . . . . . .

Installation: 1. A wiring harness for Scan and Tone Options

is incorporated in Neutec mobiles to facilitate field installation or exchange.

2. Locate and secure SC-10 Scan Board in the space provided on bottom side of radio.

3. Remove jumper from wiring harness eight pin plug and connect eight pin plug to Scan Board J903. Connect wiring harness six pin plug to Scan Board J902. Connect wiring harness four pin plug to Scan Board J90 1.

4. If MT-20 Multi Tone Board is not installed B03 pin 3, tone channel, must be connected to 4-5 VDC.

Scan Board Interconnect Table: Pin: Function: Destination: J903

1 DO Channel Selector 2 Dl Channel Selector 3 D2 Channel Selector 4 D3 Channel Selector 5 Bit 3 Orange/White wire from

channel selector 6 Bit 2 Red/White wire from

channel selector 7 Bit 1 Brown/ White wire from

channel selector 8 Bit 0 Black/White wire from

channel selector

J902 1 In List LED Amber Tone Light

cathode 2 Priority Sw. Priority Switch (center

contact) 3 Scan On/Off Scan Switch (top contact) 4 Delete Sw. Switch contact at back of

Squelch Sw. 5 4-5 VDC + 5 VDC output from

PLL Board (J202-7) 6 Ground Ground lead from PLL

Board (J202-2)

J90 1 i Carrier Receiver Board IC 1 03

pin 8 2 Decode MultiTone Board

(J90 1 pin 8) * 3 Tone Chan. MultiTone Board

(J902 pin 1 )** 4 Priority Sw. Priority Switch

(top contact)

SC- 1 0 Priority Scanner Board Installation Diagram:

Channel PLL & Display Selector 1 Board

CH IN/OUT SW +s VDC Ground

J902

SCAN BOARD

[I; Priority Enable SW Tone Channel Decode Carrier

1

Notes: *I. For units without MultiTone, J90 1 is unused.

**2. For units without MultiTone, J90 1 should be connected to +5 VDC.

Parts Variation vs Frequency Chart 30 - 50 MHz

PLL & Exciter

Receiver

C-101 C-105 C-110 C-1 13 C-1 16 C-120 C-123

Driver & APC -

I I

4.7 ohms % W 20 ohms 2 W

- 1 0 K S W

1 00 ohms 2 W 8 2 K S W

30 - 35 MHz

33P CH 33P CH 33P CH 33P CH 33P CH 25P CH 25P CH

I I

Power Amplifier

40 - 45 MHz

33P CH 25P CH 25P CH 2SP CH 25P CH 15PCH 15PCH

35 - 40 MHz

33P CH 33P CH 33P CH 33P CH 33P CH 2OP CH 2OP CH

- 1 SOP CH 300P SL 300P SL 300P SL

1 OOP CH 1PCH

36P CH 3P CH

39P CH 5P CH 5P CH

39P CH 3P CH

36P CH l P C H

45 - 50 MHz

20P CH 2OP CH 2OP CH 2OP CH 2OP CH 12P CH 12PCH

Parts Variation vs Frequency Chart 138- 174 MHz

The following components should be changed to the indicated values when the frequency spread is other than 1 48- 1 65 MHz.

Driver & APC

C40 1 C403 C407 C411 others

160- 174 MHz

not used

not used 2OpF cer. not used not used *Note 1.

148 - 165 MHz

1 pF cer.

Receiver

Cl02 C104 C109 C l l 2 Cl 15 Cl2 l C124

not used not used not used not used *Note 1.

138 - 148 MHz

4pF cer.

not used

Power Amplifier

Note. 1 Shunt a 220 ohm % watt resistor between C402 input side and ground. Nore 2. Shunt a 30pF ceramic capacitator between the collector of 0 5 0 1 and ground.

C506 C507 others

not used 39pF cer. *Note 2.

not used not used

VCO Connect a wattmeter and a dummy load of suitable dissipatior; to the antenna connector. Connect a high impedance voltmeter to test point CPZOI, which is located next to the shielded area (VCOs) on the synthesizer/exciter board.

(NOTE: With the PLL/exci ter board upright and while facing the front of the radio, you will see the RX VCO coil on your left and the TX VCO coil on your right within the VCO shielded area. CP2Ol is to the right of the coils.)

Adjust the RX VCO (L201) for about 4 V DC while on a channel which is approximately in the center of the desired frequency range. Readjust I201 to obtain no less than 1.0 V DC on the lowest operating frequency and no more than 7.5 V DC on the highest.

(NOTE: It is important that the VCO coils be adjusted carefully and with the proper tuning tool to avoid damaging the core. It is also important that the friction locking rubber piece inserted between the core and the coil be in place to eliminate the possibility of the VCO falling outside the 1.0 to 7.2 volt range during vibration or movement.)

After adjusting the RX VCO, activate the transmitter and adjust the TX VCO coil (1202) in the same manner.

~djust'the reference oscillator trimmer VC2Ol for the correct carrier frequency at the selected channel.

Transmitter Begin transmitter alignment by setting VR401 to i ts full clockwise position. Then transmit on a frequency that is near the center of the radio's assigned frequency range, and adjust the driver's input and output tuning capacitors, (VC401, VC402) for maximum output.

Now adjust the input and the output tuning capacitors for the final stage (VC50 1 and VCSOZ) for maximum output These can be reached through holes on the final P.A shield. Alternate tuning VC40 1, VC402, . VC50 1 and VC502 for maximum output power. After adjusting transmitter to maximum power, adjust VR40 1 counter-clockwise until power drops slightly. (Note: To ensure proper power output use a power supply capable of supplying 13.8 VDC at 10 amps and heavy power cables. )

While modulating the transmitter, set deviation to 4.8 Khz by adjusting VR202 (located on the PU board at the end opposite the synthesizer and the PROM ICsJ. Next, adjust mike gain potentiometer VR2Ol for proper deviation while holding the microphone at the desired speaking distance.

Receiver Select a channel on the approximate center of the desired operating range. To the antenna connector, connect a signal generator modulated by a 1 Khz tone set for 3.3 Khz deviation. Connect a SINAD meter to the external speakerjack on the rear of the radio. Turn squelch control fully cownterclockwise. Adjust: LlOl through L107 for best SINAD while maintaining the output of the generator close to the 12 dB point. Readjust coils as necessary for proper receiver response over the operating range.

IF coils L108 through Lll2 come properly tuned from1 the factory. It is not advisable to tamper with the tuning. If it becomes necessary, however, follow the SINAD method described above for front-end tuning. The 2nd local oscillator, although not usually necessary, can be set by connecting a high sensitivity frequency counter to test point CPlOl on the RX PCB and adjusting CVlOl for 21.145 MHz.

Top View - 15-

TUNING POINTS

Bottom View

- 16-

TROUBLESHOOTING AND 'SUGGESTED TEST EQUIPMENT

It is recommended that maintenance of the radio be done at the board exchange level. Service facilities can take maximum advantage of the board exchange program by stocking a set of replacement boards and by returning defective boards to the factory. The transceiver is composed of fiw boards that contain all of the circuitry. Any malfunction should be isolated to a board and verified by an exchange. The five boards are:

PLL Synthesizer/TX Exciter Receiver RF driver RF power output Display . Except for the Display and RF P.A., these boards can

be removed and replaced with a screwdriver and some care.

the RX VCO is operating, then most RX malfunctions would be a result of a problem on the receive board. Transmitter malfunctions could be on any one of three boards. As with the receiver, the first place to check would be the TX VCO voltage at CP2Ol while in the TX mode. If this voltage is correct, the problem could be in the predriver, driver or power amplifier stages.

To isolate a transmitter problem, first check the power supply current during transmit. As the driver draws approximately 2 amps, failure of the final stage would show some increase in current during transmit (about 2 amps more than while receiving). Little change in current between TX and RX would indicate problems in the predriven (PLL board) or driver (assuming the TX VCO was operational, which should be the first test). An additional test could be made with an RF probe or an RF voltmeter at the input to

General the driver stage (about 5 volts RMS should be present here). Output of driver stage should be 8.0 The PLL Synthesizer/TX exciter board contains the or more wical,.

modulator, RX and TX VCO, TX predrivers and synthesizer circuits. As such, a receive malfunction Modular construction of the transceiver was intended could be an RX VCO problem on the PU board. Proper to simplify servicing at your facility as this can be a VCO operation can easily be verified by checking hidden cost associated with other transceivers where for 1.0 to 7.2 volts at the VCO test point CP201. If troubleshooting must be pursued to the component

level.

Test Instrument Required Specifications Suggested Type

DC Power Supply Voltage: 13.8 VDC Current: 10 Amps Cont.

Astron RS-12

RF Watt Meter Frequency 136-1 74 MHz Bird Model 43 Powec 0-100 Watts With 10 C Element Impedance: 50 Ohms - - -

RF Dummy Load Impedance: 50 Ohms Bird Model 8085 or Power 50 W Model 8341-200

DC Voltmeter Range: 0-15 V Simpson 260 and DC Input Resistance 10 Meg Ohm Data Precision 1351

AC Voltmeter Range: 3 mV-I0 V Leader LMV 181 A

Deviation Meter Range: 0-5 KHz Marconi TF 2304 +/- Deviation Capability

Frequency Counter Range: 136-174 MHz Accuracy: +2 ppm/yr

HP 5383 A or Data Precision 5000-TB8

RF Signal Generator Range: 136-174 MHz Wawtek 3005 Level: 0.1-1000 uv Modulation: InternaVExternal Deviation: 0-5 kHz

--

Speaker Load Impedance: 8 Ohm Power: 7.5 Watts Min. With Switch Selectable Int. 8 Ohm Speaker

Shop Fabricated

-8V 0206 -5V

rn 6 n x 0 5 GI

VCO -- CONTROL '

i

+BV +BV +BV -5v -5v +5v

0205 IC201 t lC202 IC203 r - ------ ------

N - : CHSELECT

-4 RX

VCO TO RX PLL N + l - SYNTHESIZER - EPROM (DISPLAY I

BUFFER

bDt$l-f-lt~ SWITCH LOCK * 0214-0215

M IC -. *..

DEV 1 GAIN .' SET 1'2207 TX

COUNTER 1 O A R ! , - MIXER

I\ 1 l A

TXB+ +8V

i-, TX TX VCO

BUFFER VCO

I A

0,

I

XTAL HTR -

L- - - c ,--- - ------ J '7; AG~s, 1'2205

ADDRESS GENERATOR CLOCK

13 8V 138V

0209 0 2 1 0 0211

b 1 3 8 V

B+

IC208

- IOSW) A

0213

RF TX RF AMP OUT

SPEECH LIMITER

'

NEUTEC COMMUNICATIONS INC. 0216 +5V 4 - -

RF - AMP - - -

OUT OF

5v REGULATOR

- 0217

RF AMP

REGULATOR

+ SM-1645 MOBILE TX B+' (8V)

TXB+ SWITCH

L RX VCO ENABLE

PLLIEXCITER BOARD

RX VCO SWITCH

IC206

+8V 4 8V

0101 0102 0104 0106 r 1

ANT INPUT R F 1st 1st IF 1st IF , 2nd . 2nd IF

(From Final PCB) - AMP MIXER FILTER AMP MIXER FILTER I

RX VCO

NEUTEC COMMUNICATIONS INC. SM-1645 MOBILE

RECEIVER BOARD

I IC101 IC102 IC104

2nd IF/ DETECTOR

I IC102 1C103 0107 IC103 Dl04 0 1 08

SO CONTROL

I

A F OUT

VOL CONTROL

I

'

- NOISE DET

NOISE AMP

, , SCHMITT TRIGGER

AF SWITCH SW

BUSY LT

BLOCK DIAGRAM

NEUTEC COMMUNICATIONS INC. SM-1645 MOBILE DISPLAY BOARD

MSD

0601 25'22724

SL2271

LSD

INDICATOR

I L TO PLL

+ LED

DRIVER

4 I

IC601 IC602 IC603 CH SW I 74LS283 74185 74LS47 D604

El BINARY CODE

I - -

- I

7 BCD TO

7SEGMENT

3

' BINARY TO BCD

I 4

I

I-, 1 . 16

4

0 - 1 5

NEUTEC COMMUNICATIONS INC. SM-1645 MOBILE DRIVER BOARD

DRIVER

(0.5W)

PTT TX RF 8+ DET

TO P.A. PCB

TO PWR CONTROL

CKT

~ ~ - ~~- ~

FINAL PWR AMP BOARD

RF IN

( low) 7

RF PWR AMP _

A A

- PIN DIODE SW

D5W

B t TX ' B+

L.P.F.

I D510

- PWR

DETECTOR

ANT

LAYOUT PLL/MCIT€R BOARD

PCB 83054-2A

- 22 -

SCHEMATIC PLL/EXCITER BOARD

LAYOUT PLL/EXCIT€R BOARD

PCB 83054-2A - 24 -

SCHEMATIC PLWEXCITER BOARD 136 - 174 MHz

LAYOUT RECEIVER BOARD

PCB 83054-2A -26-

LAYOUT RECEIVER BOARD

SCHEMATIC RECEIVER BOARD 136 - 174 MHz

8201-4-IA

- 29-

LAYOUT FINAL POWER AMP BOARD

PCB 82014-5A -30-

FT501 0 .01 w h C506 ! g

1 OOOP SLl00P He' C507 2 - .l

9 0

d T 10,,/16 $ = a C508 3000-25

0 .001 *+ C509

FT502 C535 r 0.01 w m

1 OOOP 0 P

P 0 J C510

- SL300P +-l+ X E C511

R506 p x z g C H l O O P ~ ~ ' 1 K -100P 3

\ ' , VC502

0 .01

R502 CH501

1000 2 W 3.9rr

CH502 3.9!t

C532 470Q 3.911

R509

2 0 0 1W ~530-

LAYOUT FINAL POWER A M P BOARD

SCHEMATIC FINAL POWER A M P BOARD 136- 174 MHz

PCB 8201-4-SA -33-

LAYOUT DRIVER BOARD

PCB 820144A -34-

SCHEMATIC DRIVER BOARD 30 - 50 MHz

LOW BAND DRIVER & APC AMP

t 13 6 V

For TX ANTSW

P T T

PWR M T

G

LAYOUT DRIVER BOARD

PCB 820144A

-36-

SCHEMATIC DRIVER BOARD 136 - 174 MHz

TX Driver & APC Board Schem. PCB 8201-4-4A

PTT

POWER DET

GND

LAYOUT DISPLAY BOARD

PCB 8201-4-8

-38-

SCHEMATIC DISPLAY BOARD

LAYOUT RECEIVER/PLL BOARD

SCHEMATlC RECENER PLL/REPEAT€R CONTROL

LAYOUT SINGLE TONE BOARD

+5 873 0 o n 0930

OTONE DECODE

- - 0 ,i.Tlr;h # ~ T ~ F + ~ ~ o ~ I ~ Y D C , P O = 680, ~1o2dfi9733

LAYOUT MULTJTONE BOARD

LAYOUT SCAN BOARD

SCHEMATIC SCAN BOARD

PLL/TX EXCITER PCB PARTS LIST

REF IC201

202 203 204 205 206 207 208

TYPE DESCRIPTION

IC SP8793 IC MC145146 IC 2716 with Socket IC MC14161 BP I C MC14069UBP IC TA78L008 IC MC1458 IC 7805

PART #

07-8793 07-5146 07-271 6 07-41 61 07-4069 07-8008 07- 1 458 07-7805

REF TYPE DESCRIPTION PART #

Heat Sink

RF connector RF connector

Minipin jack A1 Minipin jack A1

PCB connector PCB connector PCB connector PCB connector PCB connector FET

Transistor FET

Transistor F ET

Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor

Thermistor

% w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor l/q w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor l/4 w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor % w Resistor

Vari-Cap Vari-Cap Vari-Cap Vari-Cap Vari-Cap Vari-Cap

Zener Diode Zener Zener Zener Diode Diode

Transformer AK-10 Transformer AK-10 Transformer AK-11

lnductor lnductor lnductor lnductor lnductor lnductor lnductor lnductor lnductor lnductor lnductor

Variable capacitor 20Pf

Variable Resistor IK POT Variable Resistor IK POT

X'tal 4.8MHz HC18/u

- - -- - - -

PART# I REF TYPE -- -

PART # REF TYPE DESCRIPTION

I/, w Resistor w Resistor

1!, w Resistor I/, w Resistor 1!, w Resistor I/, w Resistor I/, w Resistor 11, w Resistor I/, w Resistor 1/, w Resistor I/, w Resistor

w Resistor I/, w Resistor

1 w Metal Film 1 w Metal Film

w Resistor w Resistor

1/I w Resistor 1/4 w Resistor % w Resistor

C233 Tantalum capacitor 234 Tantalum capacitor 235 Ceramic capacitor 236 Ceramic capacitor 237 Ceramic capacitor 238 Ceramic capacitor 239 Ceramic capacitor 240 Ceramic capacitor 241 Ceramic capacitor , 242 Ceramic capacitor 243 Ceramic capacitor

i 244 Ceramic capacitor 245 Ceramic capacitor 246 Ceramic capacitor 247 Electrolytic

capacitor 248 Ceramic capacitor 249 Ceramic capacitor 250 Electrolytic

capacitor 251 Ceramic capacitor 252 Ceramic capacitor 253 Ceramic capacitor 254 Electrolytic

capacitor 255 Ceramic capacitor 256 Electrolytic

capacitor 257 Mylar 258 Ceramic capacitor 259 Electrolytic

capacitor 260 Electrolytic

capacitor 26 1 Mylar 262 Mylar 263 Mylar 264 Mylar 265 Electrolytic

capacitor 266 Ceramic capacitor 267 Ceramic capacitor 268 Ceramic capacitor 269 Electrolytic


capacitor

C201 Ceramic capacitor 202 Ceramic capacitor 203 Ceramic capacitor 204 Ceramic capacitor 205 Ceramic capacitor 206 Ceramic capacitor 207 Ceramic capacitor 208 Ceramic capacitor 209 Ceramic capacitor 210 Ceramic capacitor 21 1 Electrolytic

capacitor 212 Ceramic capacitor 213 Ceramic capacitor 214 Ceramic capacitor 21 5 Ceramic capacitor 21 6 Ceramic capacitor 21 7 Ceramic capacitor 21 8 Ceramic capacitor 21 9 Ceramic capacitor 220 Ceramic capacitor 221 Ceramic capacitor 222 Ceramic capacitor 223 Ceramic capacitor 224 Ceramic capacitor 225 Ceramic capacitor 226 Ceramic capacitor 227 Ceramic capacitor 228 Ceramic capacitor 229 Ceramic capacitor 230 Ceramic capacitor 231 Ceramic capacitor 232 Tantalum capacitor

.022pF SL 1 OOP 33uF 16V

C225A Ceramic capacitor C264A Electrolytic

capacitor C231A Ceramic capacitor

RECEIVER PCB PARTS LIST

REF TYPE -

DESCRIPTION PART X

QlOl 102 103 104 105 106 107 108 109 110

RlOl 102 103 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 143 144

Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor

Diode Diode Diode Diode Diode Diode

Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor

- - - --

REF TYPE --

DESCRIPTION PART #

Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor

C101 Ceramic capacitor 102 Ceramic capacitor 103 Ceramic capacitor 104 Ceramic capacitor 105 Ceramic capacitor 106 Ceramic capacitor 107 Ceramic capacitor 108 Ceramic capacitor 109 Ceramic capacitor 110 Ceramic capacitor 11 1 Ceramic capacitor 112 Ceramic capacitor 113 Ceramic capacitor 114 Ceramic capacitor 1 15 Ceramic capacitor 116 Ceramic capacitor 11 7 Ceramic capacitor 118 Ceramic capacitor 119 Ceramic capacitor 120 Ceramic capacitor 121 Ceramic capacitor 122 Ceramic capacitor 123 Ceramic capacitor 124 Ceramic capacitor 125 Ceramic capacitor 126 Ceramic capacitor 127 Ceramic capacitor 128 Ceramic capacitor 129 Electrolytic

capacitor 130 Ceramic capacitor 131 Ceramic capacitor 132 Ceramic capacitor 133 Ceramic capacitor 134 Ceramic capacitor 135 Ceramic capacitor 136 Ceramic capacitor 137 Ceramic capacitor 138 Ceramic capacitor 139 Ceramic capacitor 140 Ceramic capacitor 141 Ceramic capacitor 142 Ceramic capacitor 143 Ceramic capacitor 144 Electrolytic


capacitor 146 Ceramic capacitor 147 Electrolytic

capacitor 148 Ceramic capacitor

1 OK 33K 220K 1 OK 100 3.3K 15K 2.2 220

1 4.7K 1 OK

CH 8P CH 2P CH 1P CH 2P CH 6P .Ol,UF

.OOlpF .OlpF CH 2P CH 3P

SL 0.5P CH 2P CH 6P

SL 0.5P CH 2P CH 4P .01p . O l p

SL loop CH 6P CH 2P SL 0.5P CH 6P CH 2P .01p . O l p .O lp

CH 82P lop l 6 V

CH 24P .01p . G l p . O l p

CH 47P CH lOOP CH lOOP

. O l p CH l P

SL loop .047p .047p .01p .01p

4.7,~ 16V

4 . 7 ~ 16V

.047p lop l6V

.01p

REF TYPE DESCRIPTION PART X

C149 Mylar film capacitor .0047p 02-4723 150 Mylar film capaciior ,0047~ 02-4723 151 Mylar film capacitor 0 . 0 1 ~ 02- 1 033 152 Mylar film capacitor 0.01,~ 02-1 033 153 Mylar film capacitor 002& 02-2223 154 Mylar film capacitor 0 . 0 1 ~ 02-1 033 155 Ceramic capacitor 0 . 0 1 ~ 02-1 030 156 Ceramic capacitor 0.001p 02-1 020 157 Electrolytic .47p 50V 02-4748

capacitor 158 Ceramic capacitor . O l p 02-1 030 159 Ceramic capacitor . O l p 02-1 030 160 Ceramic capacitor .OOlp 02-1 020 161 Ceramic capacitor . O l p 02-1 030 162 Electrolytic 1p50V 02-1 058

capacitor 163 Electrolytic 1p 50V 02-1 058



capacitor 166 Ceramic capacitor . O O l p 02-1 020 167 Electrolytic .47p 50V 02-4748

capacitor 168 Electrolytic lop l6V 02-1 066

capacitor 169 Electrolytic .47p 50V 02-4748

capacitor 170 Tantalun capacitor .01p 6.3V 02-1045

171 Electrolytic 220p 6.3V 02-2275 capacitor

172 Mylar film capacitor 1~ 02-1 043 173 Electrolytic 1 OOp 25V 02-1 077

capacitor 174 Electrolytic 220p 16V 02-2276

capacitor 175 Ceramic capacitor .001p 02-1 020 176 Ceramic capacitor .OOlp 02-1 020 178 Ceramic capacitor .001p 02-1 020 179 Ceramic capacitor .001p 02-1 020 180 Ceramic capacitor .001p 02-1 020


C181 Ceramic capacitor .OOlp 02-1 020 182 Ceramic capacitor .001p 02-1 020 183 Ceramic capacitor . O O l p 02-1 020

L l 01 Coils AK-01 23-1001 102 Coils AK-02 23-1002 103 Coils AK-03 23-1 003 104 Coils AK-03 23-1 003 105 Coils AK-04 23-1 004 106 Coils AK-05 23-1 005 107 Coils AK-06 23-1 006 108 Coils AK-07 23-1 007 109 Coils AK-08 23-1 008 110 Coils AK-09 23-1 009 111 Coils BH169E -23-2169 112 Coils BH169E 23-21 69

CV101 Variable capacitor 20P 22-2000

VRlOl Variable Resistor 50K 21 -5030

XI01 X'tal 21.145 MHz 12-0001 HC18/u

F101 X'tal Filter 21 M15C (8C) 13-0001 21.6 MHz

102 Ceramic Filter LFB20 (8) 13-0002 103 Ceramic 4550 13-0003

Discriminator

CN101 RF Connector Minipin Jack VI 35-0001 102 RF Connector Minipin Jack VI 35-0001

J101 Connector R413614 36-0001 102 Connector R41 3614 36-0001

CHlOl Ferri Inductor 1mH 03-1 020 102 Ferri Inductor 1mH 03-1 020 103 Ferri Inductor 1mH 03-1 020 104 Ferri Inductor 220,~ H 03-221 0

Heat sink AF P.A. 65-0001 15 mm Can 66-1 500

PARTS LIST REF TYPE DESCRIPTION P A M #

Q501 Transistor 502 Transistor

Diode Diode Diode Diode Diode Diode Diode

Zener Diode Diode Diode Diode

R501 l/s w Carbon Resistor 502 2 w Metal Film 503 '/4 w Carbon Resistor 504 w Carbon Resistor 505 lh w Carbon Resistor 506 '/4 w Carbon Resistor 508 l/s w Carbon Resistor 509 w Carbon Resistor 510 1 w Metal Film

Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor

Electrolytic capacitor

Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor

REF - R515

516 517 51 8 519 520 521 522 523 524 525 526 527 528 529 530 53 1 532 533 534 535

TYPE DESCRIPTION -

PART #


D.M. capacitor D.M. capacitor

Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor

Feed-Through Feed-Throug h Feed-Through


VC501 Variable capacitor 502 Variable capacitor

TH501 Thermisistor

CH501 Ferri Inductor 502 Ferri Inductor 503 Ferri lnductor

-

SL 1 OOP SL loop .001p .01p

.OOlp(M)

.001p(M) . O l p

CH 20P CH 2P CH 30P CH 9P

CH 24P CH 6P CH 15P .OOl / l . O O l p .001p . O l p .O1 .01

SL .75PF

CVOl C450 CVOl C450

35D46

lPH 1PH 1PH

L501 Coil HF 3LR35J 23-8335 502 Coil AK-15 23-1 01 5 503 Coil AK-16 23-101 6 504 Coil AK-17 23-1017 505 Coil AK-18 23-1 01 8 506 Coil AK-19 23-1019

F.B. Ferrite Beads FBl 01 67-0001

PARTS LIST

Transistor Transistor Transistor Transistor Transistor Transistor


LED Diode Diode


2W Metal Film I/, Carbon Resistor I/, Carbon Resistor I/, Carbon Resistor '/, Carbon Resistor

Carbon Resistor I/, Carbon Resistor I/, Carbon Resistor I/, Carbon Resistor I/, Carbon Resistor

2SC2539 2SB596 2SA695

2SC2724 2SC2724 2SA999

GL-9NR2 IS1588 181588

56Cl I oon ion 4.7n 3.3K 2.2K 3.3K 3.3K 1 OK 1 OK

C401 Ceramic capacitor CH 15P 02-1501 402 Ceramic capacitor CH 15P 02-1 501 403 Ceramic capacitor CH 20P 02-2001 404 Ceramic capacitor CH 62P 02-6201 405 Ceramic capacitor .OlpF 02- 1030

Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor

Electrolytic capacitor

VC401 Variable capacitor VC402 Variable capacitor

VR401 Variable resistor 0

L401 Coil

CN401 RF Connector Mini Pin Jack A1 35-0001

J401 2.5mm Connector R413614 36-0001

F-B Ferrite Beads FBI01 67-0001

DISPLAY PCB PARTS LlST

CHASSIS COMPONENTS PARIS LlST


IC601 I C 74LS283 07-4283 602 I C 741 85 07-41 85 603 I C 74LS47 07-7447

(2601 Transistor 2SC2724 042724

D601 , Diode GL-9NY2 14-0004 602 Diode GL-9NR2 14-0002 603 Diode GL-9NG2 14-0005 604 Diode SL-2271 14-2271

A601 '/e w Carbon Resistor 1 K 01-1025 601 '/a w Carbon Resistor 1 K 01-1025 602 '/s w Carbon Resistor 1 K 01-1025 603 '/a w Carbon Resistor 1 K 01-1025 604 '/e w Carbon Resistor 1 K 01 -1 025


A605 '14 w Carbon Resistor 10K 01-1 030 606 '14 w Carbon Resistor 1K 01-1 020 607 '/, w Carbon Resistor 1K 01-1 020 608 '14 w Carbon Resistor 1K 01-1020 609 '/, w Carbon Resistor 1 K 01-1 020 610 '/4 w Carbon Resistor 1 K 01-1020 61 1 '1'4 w Carbon Resistor 1K 01-1020 612 'h w Carbon Resistor 1K 01-1020 613 '14 w Carbon Resistor 1K 01-1020 614 '/, w Carbon Resistor 1K 01-1020 615 114 w Carbon Resistor 1K 01-1020 616 '14 w Carbon Resistor 1K 01-1020 617 '14 w Carbon Resistor 1K 01-1020

C601 Ceramic capacitor .OlpF 02- 1 030

REF TYPE DESCRIPTION PART %

S703 Channel SW 91 -0003

VR701 Volume Pot 20K 91 -0001 702 Squelch Pot 20K 91-0001

CN701- Mic Connector 91-0002 702 Ant Connector 91 -0006

J701 Ext Sp Jack (3.5mm) 91 -0005

702 Power Jack 91 -0004


R701 1W Metal Film ion 01-1002

C701 Ceramic capacitor SL lOOPF 02-1012 702 Ceramic capacitor SL lOOP 02-1 01 2 703 Ceramic capacitor SL lOOP 02-1012

\ \ BLU

\\\> a W

w a

W

o * - J o y!? jk 's >

a

x N J

I

4 v J701

cL-L-L-J-"-"-J.. Z 0 3 1 2 3 4 5 6 7

0 > 4

J20 ' [" v, v v v v 1 + C O Z U o n m C E - 2 2 2

DRIVER PCB a 3 w 0 u Z

0 2 @ < I CN201

Y J > Z 0 -1 w z a w

P L L m > - ( 3 0 ~r - -- -

- 6 6 : m f

F I N A L PCB PCB

X Z Z CN202

EXT

BLK

O r - c o r - z z m J O U P SPEAKER

vvvvvv~r

7 6 5 4 3 2 1

J401I-I CN402

' = + + = ' - a a

3 Z i i $ G Z 5 m w ~ o a m m

~ 2 0 2 [,*A ,, A A ]

7 6 5 4 3 2 1

~ X X I X Z * + u u u o w T

-

:: 7

L ~ 4 0 1 - 7 W W L ~ 4 0 1 - 3

ORN

YEL L J 4 0 1 - 5

--

i L J 6 0 2 DISPLAY PC8

\ -l> VOLUME

VOLUME O m m h W

EXT DC INPUT

1 2 1 2 3 4 5 6 M T 2 0 1645 WIRING DIAGRAM T O 5 5

1102 g l NTERFACE

ISCR 2

J m a m m w

T O TO

C N 1 0 2 F l NAL P C B

I C 2 0 3

- 3

7 -

t

LIMITED WARRANTY

service manual neutec sm1645

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