TL;DR My Digirig won’t trigger any of my radios to transmit from any of my computers.
I’m having with PTT over multiple OS (Ubuntu, Raspberry Pi, and Windows 10) and multiple radios (Baofang UV-5XP, AnyTone AT-D878UV, and Yaesu FT-70D).
I purchased the DigiRig back in August and was initially successful in getting direwolf receiving and sending APRS. Hooray!
My setup was a raspberry pi 4, Digirig, and Baofang UV-5XP radio. I’m not a fan of the Baofang radios, but if I did something stupid, I’d rather let the magic smoke out of a $35 radio than my $300 radio!
My non-radio life caught up with me and I’ve not been able to get back to trying the Digirig until two weeks ago.
I tried the same setup (RPi->Direwolf->Digirig->Baofang). I was able to receive APRS without a problem. Transmitting, on the other hand, was a problem.
I watched the excellent troubleshooting video that Denis posted. Here’s what I found.
I started with continuity tests of the cable. This is the cable from digirig (by the way, I’m very impressed by the quality of all the cables I purchased). All the conductors match the wiring diagram on the product page. They all read less than an ohm of resistance. There are no shorts between conductors.
I don’t think the problem is the cable.
In Denis’ troubleshooting video, he demonstrated using tweezers to short the sleeve and ring 2 while the cable was connected to a radio. To date, I’ve not been able to get this to work with any of my radios.
I’ve checked the tweezers, they measure less than an ohm of resistance when I check them. When I use the tweezers to short the sleeve and ring and measure the resistance between the sleeves of the connector side, I read less than an ohm (usually around 0.6 ohms in both cases).
However, every time I plug the connector into any of my radios and short the sleeve and ring, I don’t get the PTT on the radio to engage like I saw in Denis’ video.
I have a hand mic from AnyTone that works on both my AnyTone and all of my Baofang radios. When I measure the resistance between the sleeves of the connector of the hand mic when I press the PTT button, it again reads less than an ohm. And, when I plug this hand mic into any of my radios and push the PTT, the radio immediately starts transmitting.
From all my reading, when the sleeves of a Kenwood style connector (either my hand mic or the digirig cable) are both at or very near to ground, essentially shorting them, I would expect the radio to key up and start transmitting.
Ok, so maybe the radios are smarter than I expect and want to have more than just PTT. So I tried the next test from Denis’ troubleshooting video, using wsjt-s “Test PTT” to test PTT. Unfortunately, every time I tested this, I was not able to trigger any of my radios to transmit.
Please note: I’ve tried all the above tests on all my radios and on all the computers I have. I have a Windows 10 laptop, a desktop computer with Ubuntu 22, and three different Raspberry Pi (a Pi 3, Pi 4, and a Pi 400). I try all of my HT on all three kinds of computers and OS.
So, what does the Digirig do when not connected to a radio? I unplugged the connector from the radio (and turned the radio off!) and measured the resistance between the sleeves on the kenwood connector from all my computers. When RTS is not enabled, the resistance reads as an open. That’s what I would expect. When I turn on RTS (usually from WSJT-X because it’s the most convenient) I see something I didn’t expect, the resistance between the sleeves is less than 1 ohm (about 0.6 ohm).
I have been reading through the forum posts and trying the suggestions there. Because I’m trying to get the Digirig running on my Raspberry Pi, and I did have a GPS, I made sure the “USBAUTO” is set to false and even stopped the gpsd. It didn’t help.
I’ve been reading through the manuals of all my radios and turning off everything that might cause problems. For example, I found a lot of CTCSS tone related settings on the Baofangs but I don’t see why that would prevent them from transmitting when I’m using the Digirig when the radios transmit just fine when I’m using the handmic.
If you have any suggestions of what I haven’t tried yet, I’m very eager to hear. Everything else I’ve done with the Digirig (mostly audio related) have worked great. I’m hoping I didn’t do something stupid to the Digirig for the RTS/PTT function. I would think that if I read a short between the sleeves when I have RTS enabled, that would be enough to key the radios.