Hello ,
we are trying to connect 2 als3 rpi3 nodes with a repeater controller , the issue is that
the controller is looking for
1- +5 at the PTT
2- +5 for the COR
we resolved the PTT by putting a pull-up resistor at +5
the COR we can’t get it to pull down to 0v, it always hover at 1.4v
no mater what settings in the tune menu , also did the cm108 bug upgrade and still cant get it to work,
PS. I have it set as Duplex Type=3 i also tried different settings
is there a place that i can get a +v on the chip that when it receive a signal so i can get a transistor to pull down the COR ?
any ideas how to get this to work ?
if i connect a radio to the sound card instead of the controller everything works great , we have multiple of these controllers that we need to inter connect via IP
This is going to entirely be dependent on the audio interface you’re using. However if the controller is active-high at 5v, then it usually is a transition around 2v such that 0V-2V should be seen as inactive-low, not just pulled to ground at 0v. 1.4V should be well past the transition region of an active-high logic port. You should only need a pull-up or pull-down resistor if you’re connected directly to an open collector. The repeater controller’s manual should specify if this is the case. If it is:
Make sure that your Pi, audio interface, and repeater controller all have the same DC ground level. This cannot be assured through AC/DC converters. Make sure they’re all tied together at DC/chassis ground.
If your controller has to have pulled-to-ground as inactive and you need to use a pull-down resistor, then you need two resistors. Put 10K resistor between the repeater controller and the sound board GPIO and one 10K between the sound board GPIO and ground.