SARTS Repeaters
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Re: SARTS Repeaters
SLR-5500 Auxilliary connector pinouts
Current settings
GPIO1 - External PTT
GPIO5 - CSQ
Current settings
GPIO1 - External PTT
GPIO5 - CSQ
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Re: SARTS Repeaters
18 Sep 2021
CPS 2.0 finally connected to the repeater after installation of the RNDIS drivers. The following are the current settings:-
1. Power at 35W (25W into antenna after 1.5dB cavity loss)
2. CTCSS 156.7Hz
3. Time out timer at 300s (5mins)
4. Hang-time 1s
5. Analog only mode
6. Voice de & pre-emphasis on
CPS 2.0 finally connected to the repeater after installation of the RNDIS drivers. The following are the current settings:-
1. Power at 35W (25W into antenna after 1.5dB cavity loss)
2. CTCSS 156.7Hz
3. Time out timer at 300s (5mins)
4. Hang-time 1s
5. Analog only mode
6. Voice de & pre-emphasis on
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- 18Sep2021-478IVY2431.zip
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Re: SARTS Repeaters
Lightning protection classes:-
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Re: SARTS Repeaters
Antenna choices:-
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Re: SARTS Repeaters
X50 was put in place and, as expected, the performance was worse than the X200 and noticeable though not that great. For fringe stations, it was more noticeable.
Now looking at LNA candidates to insert between cavity and RX port of the repeater.
https://www.downeastmicrowave.com/product-p/l144lna.htm
http://www.advancedreceiver.com/page5.html
https://vhfdesign.com/lnas/lna-eme-atf5 ... bands.html
https://www.ebay.com/itm/173854373799
LNA's need to be 0.5dB NF or less. We may need to use in-line attenuators to bring the gain down to something more reasonable? 10-12dB?
A site noise survey should be done to see how much local noise there is. This can be done with an SA to see if the noise floor is high. Alternatively, connect a radio to see if the noise floor is louder.
Now looking at LNA candidates to insert between cavity and RX port of the repeater.
https://www.downeastmicrowave.com/product-p/l144lna.htm
http://www.advancedreceiver.com/page5.html
https://vhfdesign.com/lnas/lna-eme-atf5 ... bands.html
https://www.ebay.com/itm/173854373799
LNA's need to be 0.5dB NF or less. We may need to use in-line attenuators to bring the gain down to something more reasonable? 10-12dB?
A site noise survey should be done to see how much local noise there is. This can be done with an SA to see if the noise floor is high. Alternatively, connect a radio to see if the noise floor is louder.
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Re: SARTS Repeaters
LNA and 2m Bandpass filter
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Re: SARTS Repeaters
2m Bandpass filter performance
Insertion loss @145.025MHz = 0.80dB
Insertion loss @145.025MHz = 0.80dB
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Re: SARTS Repeaters
LNA144 performance
Gain @145.025MHz = 20dB
Gain @145.025MHz = 20dB
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Re: SARTS Repeaters
Retuning Telewave TPRD-1544 for second repeater (145.075/145.675MHz)
Final results:
TX insertion loss = 1.24dB
RX insertion loss = 2.87dB
TX-RX isolation @145.675MHz = 84.43dB
TX-RX isolation @145.075MHz = 73.44dB
TX SWR = 1.31
Final results:
TX insertion loss = 1.24dB
RX insertion loss = 2.87dB
TX-RX isolation @145.675MHz = 84.43dB
TX-RX isolation @145.075MHz = 73.44dB
TX SWR = 1.31
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Re: SARTS Repeaters
In the process of setting up an RPi4 for AllStarLink.
https://wiki.allstarlink.org/wiki/Beginners_Guide
http://avrtx.cn/download/R1-2020/R1-202 ... 202020.pdf
https://docs.google.com/document/d/1eN5 ... -Qjkg/edit
https://wiki.allstarlink.org/wiki/Beginners_Guide
http://avrtx.cn/download/R1-2020/R1-202 ... 202020.pdf
https://docs.google.com/document/d/1eN5 ... -Qjkg/edit
- Attachments
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- R1-2020 User Manual-V1.7-September 15, 2020.pdf
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