Remote PA & LNA - Roadrunners Microwave...
Transcript of Remote PA & LNA - Roadrunners Microwave...
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K5TRA
Remote PA & LNA
For 144, 222, and 432 MHz
1 T.Apel
![Page 2: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/2.jpg)
K5TRA
VHF-UHF Remote PA & LNAs
2 T.Apel
222.060 MHz Beacon 4
32
MH
z
22
2 M
Hz
14
4 M
Hz
![Page 3: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/3.jpg)
K5TRA
222 MHz Remote PA & LNA
3 T.Apel
222.060 MHz Beacon
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K5TRA
Overview
4 T.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
![Page 5: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/5.jpg)
K5TRA
Important Details
5 T.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
![Page 6: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/6.jpg)
K5TRA
Control
6 T.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
![Page 7: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/7.jpg)
K5TRA
PA Board Layout
7 T.Apel
![Page 8: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/8.jpg)
K5TRA
Remote PA
8 T.Apel
222.060 MHz Beacon 222 MHz PA ASSEMBLY
![Page 9: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/9.jpg)
K5TRA
PA Schematic
9 T.Apel
222 MHz PA DESIGN
![Page 10: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/10.jpg)
K5TRA
PA Input L-Pad Design
10 T.Apel
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K5TRA
PA Control Schematic
11 T.Apel
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K5TRA
LNA Board Layout
12 T.Apel
LNA BOARD IS OPTIONAL
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K5TRA
Remote LNA
13 T.Apel
222.060 MHz Beacon 222 MHz ASSEMBLY
![Page 14: Remote PA & LNA - Roadrunners Microwave Groupk5rmg.com/wp-content/uploads/2013/04/remotepalnas.pdf144 MHz Remote PA & LNA T.Apel 22 222.060 MHz Beacon Title Slide 1 Author Tom Created](https://reader033.fdocuments.net/reader033/viewer/2022052717/5f043bf77e708231d40cf913/html5/thumbnails/14.jpg)
K5TRA
LNA Control Schematic
14 T.Apel
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K5TRA
Preselector Design
15 T.Apel
222 MHz BPF
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K5TRA
Helical BPF
16 T.Apel
222 MHz ASSEMBLY
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K5TRA
LNA Preselector Response
17 T.Apel
222.060 MHz Beacon
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K5TRA
More Helical BPFs
18 T.Apel
432 MHz ASSEMBLY
144 MHz ASSEMBLY
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K5TRA
222 MHz Remote Amplifier in Attic
19 T.Apel
222.060 MHz Beacon
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K5TRA
902, 1296, 144, & 432 Remote Amplifiers
20 T.Apel
222.060 MHz Beacon
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K5TRA
WEB-IP Power Strip
21 T.Apel
222.060 MHz Beacon
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K5TRA
144 MHz Remote PA & LNA
22 T.Apel
222.060 MHz Beacon