- How to bring "down" PTT?
Re: How to bring "down" PTT?
Steve McGrane <temporarilyoffline@...>
toggle quoted messageShow quoted text
Ok, so now it works... magic I guess.
DRAWS => RADIO
AFOUT => MIC
PTT => PTT
GND => MIC GND
AFIN => Rear Speaker TIP
Sep Non-insulated GND in DIN cable => GND in RJ-45 Bundle
I'm not really sure why this works, all I did was change around the ground alignment. Before I was marrying all the grounds, now I have the MIC/MIC GND isolated to the DRAWS GND
If anybody can explain this, I'm all ears.
The PTT line is 4.94v when the radio is on and the DRAWS/Pi is not
When the Pi comes on, the PTT line goes negative.
I have PTT line on draws connected to PTT line on Radio... but I'm thinking they both produce 5v and they should be connected in a crossover fashion?
On Mon, Jun 3, 2019 at 8:23 AM Bryan Hoyer <bhhoyer@...
The PTT Output on DRAWS is an open collector NPN Transistor. It expects the Radio to have a pullup to Positive voltage, typically 5-12V.
If the PTT LED goes off then the SW has done its job.
Measure the voltage on PTT when yo power up, then again when you PTT and release.
Join firstname.lastname@example.org to automatically receive all group messages.