Pi-Star allows everyone to setup and run a digital voice Hotspot easily, its ease of use largely contributed to the late Hotspot invasion. However, the DStar software shipping with it is quite outdated. It is a version dating back from 2015 and it misses some nice features : Forwarding DPRS data to APRS for Kenwood THD74, multiple ircddb networks capability, G2 Nat Traversal to allow call sign routing without any port forwarding…
After a couple of frustrations (here and here) I have finally managed to get my TYT TH-9000D running quite well with my Tinytrak 4. After a few weeks using it I must say I am quite pleased with the result, the TH-9000D is sensitive and there are not many APRS frames I miss from the nearby digipeaters. I run it on low power (10W) which is plenty enough. So here it is finally, what should have been a quite straight forward mod from the beginning.
Next episode of my TYT TH-9000D for APRS adventures (first episode here). Somehow I managed to run into the gibberish characters issue, after swearing a few minutes I went to my friend Google only to find out that people had the same issue. Some people even posting “contact me private i have a fix” like here and in the comments of this Youtube video. Such behavior is just childish, my 6 years old does this like “I have a secret but I won’t tell you” but she is 6 years old… Just share the information, spread the knowledge, we are hams !
I was in the market for another radio for my mobile APRS operations. After reading various articles (here and here) about the ability to add a D-SUB9 connector with all relevant signals for that matter. I ordered one, and it was there a few days later. Before modding the radio I wanted to program the relevant memory channels and test run it and there came the disappointment.
So I had my Arduino Due based MMDVM up and running on the hill top and wanted to upload new firmware to it without driving 30km up to the repeater site. The Raspberry Pi3 it is connected to is completely headless, no desktop, no vnc … only ssh. I tried stuff like forwarding the serial port over TCP, but no joy.
Introduction I came across a Motorola R100 repeater, those were very capable low to mid duty repeaters in the late 80s up to the 21st century, yet some of them are still in commercial use. What follows is more or less a memo on how I converted it for digital use and eventually analog/digital use. I got awesome results in DStar, pretty good results in DMR but Fusion is not so good as I did not have a Fusion radio to test. There is a huge amount of information available online, especially on Repeater Builder they even have information on DStar interfacing but the latter did not work for me. What follows applies to the UHF variant of the repeater, for VHF your mileage may vary. This worked for me and might not work for your particular case.