remote pa & lna - k5tra
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K5TRA
Remote PA & LNA
For 144, 222, and 432 MHz
1T.Apel
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K5TRA
VHF-UHF Remote PA & LNAs
2T.Apel
222.060 MHz Beacon4
32
MH
z
22
2 M
Hz
14
4 M
Hz
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K5TRA
222 MHz Remote PA & LNA
3T.Apel
222.060 MHz Beacon
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K5TRA
Overview
4T.Apel
• Remote PAs and LNAs for operation at the antenna
• T/R switching is drive sensed
• Schottky detector circuit is tweaked for sensitivity– As low as +18 dBm will key the control circuit
• TX key hold time constant is 1.2 seconds
• Housing-heatsink from GE MASTR-III 120W PA
• Motorola MRF-186 LDMOS final provides:– 125 W output on each band: 144, 222, and 432 MHz
– Gain (approx. +19 dB) padded at input for available drive
• Triquint TQP3M9008 LNA provides:– 0.8 dB NF on each band: 144, 222, and 432 MHz
– Gain ( approx.+22 dB) padded at output to + 12 dB
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K5TRA
Important Details
5T.Apel
• LNA preselector filter is required– FM and TV broadcast signals will overwhelm the LNA without filtering
– Two helical resonator BPF used
• LNA protection diodes required– Leading edge protection while relay control activates
– Leakage capacitance in relay can allow excessive RF into LNA when transmitting
• PA input pad prevents overdrive– MRF186 easily provides +19 dB of gain
– Two resistor, compact L-pad topology
– For added ruggedness to overdrive and mismatch, the final can be changed to MRF151G for VHF or MRF372 for UHF
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K5TRA
Control
6T.Apel
• Off mode:– RF pass through
• RX mode:– LNA is powered ON
– PA BIAS is removed
– Relays select LNA signal path
• TX mode:– LNA is powered OFF
– LNA PIN protect is turned ON
– PA BIAS turned ON
– Relays select PA signal path
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K5TRA
PA Board Layout
7T.Apel
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K5TRA
Remote PA
8T.Apel
222.060 MHz Beacon222 MHz PA ASSEMBLY
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K5TRA
PA Schematic
9T.Apel
222 MHz PA DESIGN
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K5TRA
PA Input L-Pad Design
10T.Apel
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K5TRA
PA Control Schematic
11T.Apel
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K5TRA
LNA Board Layout
12T.Apel
LNA BOARD IS OPTIONAL
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K5TRA
Remote LNA
13T.Apel
222.060 MHz Beacon222 MHz ASSEMBLY
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K5TRA
LNA Control Schematic
14T.Apel
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K5TRA
Preselector Design
15T.Apel
222 MHz BPF
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K5TRA
Helical BPF
16T.Apel
222 MHz ASSEMBLY
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K5TRA
LNA Preselector Response
17T.Apel
222.060 MHz Beacon
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K5TRA
More Helical BPFs
18T.Apel
432 MHz ASSEMBLY
144 MHz ASSEMBLY
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K5TRA
222 MHz Remote Amplifier in Attic
19T.Apel
222.060 MHz Beacon
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K5TRA
902, 1296, 144, & 432 Remote Amplifiers
20T.Apel
222.060 MHz Beacon
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K5TRA
WEB-IP Power Strip
21T.Apel
222.060 MHz Beacon
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K5TRA
144 MHz Remote PA & LNA
22T.Apel
222.060 MHz Beacon