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Pin 11 is RX Audio Out. It is partially programmable (from the install manual): There are two possible outputs: (1) Discriminator Audio, and (2) Continuous filtered RX audio. The nominal output for Discriminator Audio is 330mV rms at 60% deviation and for Filtered Audio 600mV rms at 60% deviation at 1kHz.
In the CPS: Radio Configuration --> Accessory Configuration --> RX Audio Type
Select either Flat Audio or Filtered Audio.
Pin 7 is Ground.
jim202
Member
The pin 11 is correct and the setting of filtered audio is the way to go. I would use an in series capacitor of say 1.0 uf to block the DC bias voltage you will find on pin 11. Not knowing the circuit that your going to connect up to, it would be a good idea to include the capacitor.
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- Aug 17, 2010
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i would use pin 1 speaker (-) instead of ground, replacing an audio amp is not cheap nor easy. i can't remember for 100% if the amp uses an isolated ground like other models of M radios do, but if it does using hard ground will damage it.
I think you are right for two reasons: First, we have a Zetron Model 19 Simplexor and a custom tone system on our base station. It takes Audio from Pin 11 (but they are using the Discriminator signal for some reason) and uses Ground on Pin 7. Pins 1 and 16 are not used at all for this application.
Second, the CDM install manual specifically warns against grounding either Pin 1 or Pin 16, but doesn't specify any further details except that these pins are the isolated output of the audio amplifier.
Both points would seem to confirm that one should avoid using 1 & 16 for anything other than an external speaker.
dfaro
Newbie
CDM-1250 Accessory Connector PIN 11
What is the impedance of PIN 11?
What is the impedance of PIN 11?
Output impedance is about 1000 ohms or less. I use a 2uf non polar capacitor and a 2K resistor in series so the output is NOT overloaded.
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