Tsebi Projects Forum

TCI to CAT (ICOM, Yaesu or Kenwood) bridge using ESP32

https://iw7dmh.jimdofree.com/sunsdr2-pr ... libraries/

SunSDR2DX to SPE 1.3K-FA cable In our cable the PC817 optocoupler is flipped upside down to get the pins in a matching orientation. The pins have been bent up. The SPE supposedly requires only a 2mA current rating so the PC817 should be okay (nominal 5mA). There is a 620-ohm resistor in series with ...

For the digipeater, check pi@ port 60023

Use "screen -r" to reattach to the screen, and "ctrl-A" followed by "D" to detach.

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

Packet levels On our implementation, with the notch on the top and looking into the connector from the 1-o'clock position clockwise:- 1. PR1 from the radio into the TNC 2. PKS - PTT keying 3. output from the TNC to the radio PKD (calibrated for an output of 40mV p-p) 4. Ground to radio DE The outpu...

Second digipeater hardware

1. Vention USB soundcard (Challenger SGD10)
2. Raspberry Pi 4 8GB
3. PR1 and PKD pass through 1:1 Bourne audio transformer with 10uF on radio side
4. GPIO 18 as PTT
5. GPIO 23 as DCD

For a guide to installing Direwolf on the Raspberry Pi 4

http://hb1bbs.com/Raspberry-Setup/

Note that in order to get SSH running on headless set ups - you will need to create a file called "SSH" in the boot directory.

Main unit to display unit protocol

https://kk4hej.wordpress.com/decoding-t ... -protocol/

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