- VHP Cathode RayDirection FinderEquipmentswith Cathode Ray DF ReceiverTELEGON IV as principal unit

PST 638-U/80 20 to 80 MHzPST 638-U/180 60 to 180 MHzPST 638-U/20-180 20 to 180 MHz

LeafletIB 602 E

VHP Accessory Unit UK 638/80 (left) and Main DF Receiver Unit SiG 638/2 (right)

General Remarks

VHF DF accessory units and VHF DFantenna systems for the HF CathodeRay DF Receiver SiG 638/2 (TELEGONIV) are at present being prepared fordelivery by Messrs. AEG-TELEFUNKEN,These units are designed to cover afrequency range from 20 to 180 MHz.This complete frequency range is sub-divided into two subranges, from 20 to80 MHz and from 60 to 180 MHz re-spectively. A separate DF accessoryunit is provided for each of these sub-ranges. A range switch is required inaddition if both DF accessory units areto be used ahead of the DF ReceiverSiG 638/2.

The VHF DF antenna system is an H-Adcock having two antenna planes

mutually displaced through 90°. Eachantenna plane contains parallel-con-nected dipole pairs which are arrangeddiagonally with respect to each other,so that the complete antenna systemconsists of eight vertical dipoles. TheDF antenna system for the range from20 to 80 MHz uses a base of 1.4 m,whereas that for the range from 60 to180 MHz uses a base of 0.83 m. Thesense antenna rod is in each case ar-ranged centrally with respect to theupper dipole halves.

Applications

The VHF Cathode Ray DF EquipmentPST638-U is suitable as VHF DF equip-ment and for omnidirectional VHF re-

ception, in the frequency range from20 to 80 MHz or 60 to 180 MHz, or from20 to 180 MHz with both ranges com-bined. The DF bearing indication andquadrant display for sense determinat-ion are given on the cathode ray tubeof the DF Receiver SiG 638/2 (TELE-GON IV). The equipment is suitable forDF and omnidirectional reception ofamplitude modulated and frequencymodulated transmissions.

A ferrite HF DF antenna or an HF U-Adcock antenna system with Adcockaccessory unit can be connected ad-ditionally to the VHF DF accessory unit.DF and omnidirectional reception isthen additionally possible in the HFrange.

Technical Data

(VHP Accessory Units UK 638/80 withVHP DP Antenna A 638/80, andUK 638/180 with A 638/180)

Frequency Range:

Types of Reception:

Types of Service:

20 to 80 MHz for Type UK 638/8060 to 180 MHz for Type UK 638/180

AM with AFCAM without AFCFM, broad, without AFCFM, sharp, without AFCFM, broad, with AFCFM, sharp, with AFC

A1 CW telegraphyA2 MCW telegraphyA3 telephony, amplitude-modulatedF3 telephony, frequency-modulated

-

Frequency Scale: vertical spiral scale, total length about 2 m with 6.5 turns, with follow-up coveringmask and floodlit read-off marker which can be displaced through ± 3 mmfor calibration adjustments

Frequency Scale Resolution: 1 mm scale rotation' corresponds to a mean frequency change of:55 kHz for Type UK 638/80

160 kHz for Type UK 638/180

Sensitivity: measured after the chopper stage,better than 10 kT0 (10 dB) for Type UK 638/80better than 15 kT0 (12 dB) for Type UK 638/180

Intermediate Frequencyof the VHP DF Channels: 10.7 MHz

1st. Intermediate Frequencyof the F3 Aural Channel: 10.7 MHz

2nd. Intermediate Frequencyof the F3 Aural Channel: 10.175 MHz

Bandwidth: a) about ± 50 kHz (for 3 dB down)b) about ±5.5 kHz (for 3 dB down)

Image Frequency Rejection:

RF Gain Control Range:

^ 60 dB for Type UK 638/80^ 40 dB for Type UK 638/180

about 21 dB, in three fixed-value steps each giving a control factor of

/5~(7 dB)

Gain Matching Factor:

Phase Control Range in theDF Channels:

1 :4 (12 dB)

80C

Phase Control Range in theSense Antenna Channel:

RF Inputs from the Antennas:

continuous from 0 to 360°, latching at 0°

a) 3 X 60 Q, coaxial (VHP DF antenna)b) 3 X 120 Q, balanced (MF/HF DF antenna)

-

RF Outputs to DF ReceiverSiG 638/2:

VHF Oscillator Outputs:

External Oscillator Input:

RF Output for Back-MixingSignal Voltage toDF Receiver SiG 638/2:

IF Output "broad":

IF Input "sharp" fromDF Receiver SiG 638/2:

Voltage and CurrentRequirements:

Equipment Accuracy:

DF Sensitivity:

3 x 120 Q, balanced, 10.7 MHz for VHF operationor 250 kHz to 30 MHz for MF/HF operation

for Type UK 638/80:a) 30.7 to 90.7 MHz, 60 mV across 60 Q, for frequency indicator or other purposesb) 30.7 to 90.7 MHz, 2 mV across 60 Q, for special purposesfor Type UK 638/180:a) 35.35 to 95.35 MHz, 60 mV across 60 Q, for frequency indicator or other

purposesb) 70.7 to 190.7 MHz, i 2 mV across 60 Q, for special purposes

60 mV across 60 Q30.7 to 90.7 MHz for Type UK 638/8070.7 to 190.7 MHz for Type UK 638/180

a) 10.175 MHz, crystal-controlled, for A1 to A3 service typesb) 10.175 MHz, frequency-modulated, for F3 service type

10.7 MHz ± 1 MHz, for VHF panorama accessory unit or other purposes

525 kHz, for AFC function on A1 to A3 service types

+ 24 V, about 200 mA+ 14V (stabilised), about 65 mAboth voltages are provided by the power supply section in the main DF ReceiverUnit SiG 638/2

better than ± 2°

the following field strengths are required for a signal/noise ratio of 3 :1

for Type UK 638/80 with DF Antenna A 638/80:

Service Type A1BandwidthDeviationModulation

20 MHz50 MHz80 MHz

-

7.0 |iV/m1.5 |j,V/m1.4 jiV/m

F3sharp± 5 kHzvoice

13 [iV/m3 siV/m3 [JiV/m

F3broad± 15 kHzvoice

16.0 iiV/m3.5 (iV/m3.8 |jiV/m

for Type UK 638/180 with DF Antenna A 638/180:

Service Type A1 F3BandwidthDeviationModulation

60 MHz100 MHz180 MHz

——

-

7.0 (iV/m1.6 [j,V/m1 .8 |jiV/m

sharp± 5 kHzvoice

13.0 |j.V/m3.5 iiV/m3.5 iiV/m

F3broad± 15 kHzvoice

16.0 iiV/m4.5 jW/m4.5 iiV/m

Voice-modulated F3 transmissions can also be observed in the equipment oper-ating mode A1 to A3 for taking DF bearings, if the voice modulation containssufficiently long and frequent breaks.

Antenna System Errorsfor Type A 638/80:

for Type A 638/180:

MHz:degrees:

MHz:degrees:

200

600

500.3

1000.2

801

1400.5

1801

The system error is azimuth- and frequency-dependent. The error pattern over thefull bearing circle has approximately eights-circle symmetry and can be compiledin the form of correction curves for graded frequencies.

RF Cables between VHP DFAntenna and VHF Accessory Unit:

RF Cable Lengths:

Antenna Version

Number of Dipoles:Length of Dipoles:Diameter of Dipoles:Dipole Base:Length of Sense Antenna Rod:Length of one Dipole Half:

Distance from lower edge offixing flange to center ofdipole arm:

3 cables, 60 Q coaxial with special shielding, Type: 1.5/6.5 LDD

a) standard version 9 m, permanently attached to the antenna crossheadb) additional RF cables fitted with plugs, maximum length 36 m, for removed

DF antenna system

A 638/80 (20 to 80 MHz)

81.4 m40 mm1.4 m1.2 m0.67 m

106 mm

A 638/180 (60 to 180 MHz)

80.84 m40 mm0.83 m0.67 m0.39 m

Fixing Flangeouter diameter:hole circle diameter:hole:

130 mm110 mm (6 X 60°)9.5 mm

For technical data of the main DFReceiver Unit SiG 638/2 (TELEGON IV),see IB 423 E and KB 016/1 E.

Dimensions and Weights

VHF Accessory Unit UK 638/80or UK 638/180overall dimensionsDF Receiver Unit SiG 638/2with support baseoverall dimensionsVHF DF Antenna A 638/80without supporting shaftVHF DF Antenna A 638/180without supporting shaftRange Switch BU 638overall dimensions

Heightmm

Widthmm

Depthmm

294314261294314

2007

1195120140

270274511

1460

890270

440495441.5

495

1460

890320360

Weightapprox. kg

34.536

30

263

Further details are given in our Description KB 076 E

ALLGEMEINE ELEKTRICITATS-GESELLSCHAFTAEG-TELEFUNKEN

Geschaftsbereich Nachrichtentechnische AnlagenExport

Fachbereich Anlagen HochfrequenzTechnische Informationsstelle

79 Ulm • Elisabethenstrasse 3

Not binding for deliveryIf reproduced source must be acknowledged

Printed in Western Germany

N1 2.6 Febr. 68 (Fr)