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Hello Lee,

?

Thanks for your response to my question. ?I took your suggestion and wired up a LED with the 1K resistor. Using some proper RPi jumper cables, I did get a response on GPIO 25; i.e. the LED lit up. I think the biggest issue here was trying to cobble together a cable that I thought would work and it didn't.

Ok.. but now you know that the Rpi and Direwolf are working.? That's key!

With that out of the way I hooked up RPi-WD-Packet_Interface. ?What I noticed is that the LED for the PTT stays high (even with just the power and ground connected), while the DCD LED responds to the RPi when the Beacon signal is sent.

Is this the PTT LED on James N7SET's RPi-WD-Packet_Interface board (good picture of a built unit -and a printable case: ). Is that with just the +3.3v and ground line connected?? No radio or audio connections connected?? Btw, per the main readme at Github:
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Selectable single-wire handheld PTT or 'Kenwood' dedicated PTT wire method

??? Most HTs use a resistor to ground on the microphone input to trigger PTT. Kenwood/Baofeng and some others have to be different and ground the mic shield to trigger. You can set a jumper to select whatever method you need.
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That's the JP6.? Do you see any different behavior with the jumper on/off?

I did solder the PCB myself (actually 2 of them because I thought the first one didn't work) and they both respond the same way with the PTT LED being constantly high. ?I assume that is why when I remove the jumper from J6, the radio stays in transmit mode (I'm just guessing now).

Right.? Curious, have you adjusted the TX timeout pot to see if the PTT LED will go OUT after a period of time?

Any thoughts?

Beyond that, only two ideas:

? 1. Are you absolutely sure you used a CMOS 555 timer - not a TTL level part - This is critical -

? 2. You're going to need to trace the connections through the PCB and see why either Q1 or the 555 is making things behave like this.

--David
KI6ZHD