
↳ Software & Firmware Releases & Issues.↳ General Motorola Solutions & Legacy Radio Discussion.Anyone have any recommendations for a Pyramid dealer? I am going to give Wavetar's method a shot as I already purchased the aftermarket cabling to attempt.Ī Pyramid smart cable with be easiest, I just need to find a dealer. I would have to send the radio out to a tech that can do this. Will, I wish this was something I was comfortable with, but I do not have the knowledge to go this route. I did not know that pin 21 was hard set to EXT PTT. When the receiver un squelches the speaker leads go to about 6 volts, that thru the resistors turns on the transistor, the collector goes to ground, low, providing a RUS (receiver un squelch). 10 K for the two series resistors, and a 3k from base to ground. One resistor from each speaker output to a transistor's base.

What we have done is use two series resistors from the two speaker outputs.

Wavetar wrote: I believe there is a 5.75Vdc on the pins, one of which can be used to activate a simple transistor circuit to get the needed ground signal.Īs I said, Pin 21 is hard coded for external PTT, active low.
