Dynon Comm to PS Engineering audio Panel

[dougnlina]

I would appreciate the groups wisdom on the puzzle because I would like to get it right the first time.  I am sure someone here has connected the Dynon Com to a PS engineering audio panel...
I am connecting Dynons Com radio to a PS engineering PMA5000EX, and I am not really understanding pin 2 on the Dynon Com, Microphone/PTT ground, and how to handle the grounds in this combination.
This is probaby mostly a case of the two companies using different  labeling protocalls and that confusing me, but Dynon's manual is completely geared to matching the Com-425 to their intercom and gives little information about connecting the COM-425 to other audio panels.
Pins of note:
Dynon Pin 10 Phones Out
Dynon Pin 9  Phones Ground
Dynon Pin 5 PTT IN
Dynon Pin 1  MIcrophone IN
Dynon Pin 2  MIcrophone PTT Ground

PMA 5000EX  Pin 9 Com1 Audio HI
PMA 5000EX  Pin 10 Com1 Audio LO
PMA 5000EX  Pin 11 Com1 Mic Audio HI
PMA 5000EX  Pin 12 Com1 Mic Key

The Shields on this connector of the PMA all ground with the chassis.  The PMA manual also states "All shields ground at audio panel only"

Thanks for the help, Doug

 

[mrdaud]

Doug, I have the PM1000 rather than the PMA5000, but you can follow the Dynon/Intercom interconnections on my schematic (I don't show shields). I don't have an audio panel, so switch radios via multi-pole switching relay. I also have a summing module (AP-60) for all my audio inputs. Not exactly your setup, but you should be able to follow the signal flow.

 

[jc2da]

The Shields on this connector of the PMA all ground at pin 43, which also grounds with the chassis, Aux 2 Audio LO, Unswitched Audio LO.  The PMA manual also states "All shields ground at audio panel only"

I dont think the schematic shows that all shields grounding at pin 43. Look again.

 

[dougnlina]

On the drawing you attached your intercom has dedicated Mic Hi, Mic Lo, and PPT, the PMA only has Mic Hi and Mic Key, so it still does clarify how to handle the MicLO grounding issue.
Jchang, you are correct, my bad, thx

 

[mrdaud]

Doug, On the SV-Comm 425 where it is labeled phone ground or mic ground, that would go to the phone lo or mic lo on the PMA. You can see on my schematic for the 425. Pin 9, that I call phone low is also phone ground. The PPT simply provides a ground that is passed internally to the comm to open the mic circuit.

 

[dougnlina]

Look at the PMA drawing in my first post, there is not phone LO or Mic LO on the PMA, therein lies the issue....

 

[mrdaud]

OK, see your issue. The Comm 1 audio lo is the same as phone lo. Mic in on the 425 goes to pin 11 on the PMA and Mic PPT/gnd on 425 goes to pin 35 on PMA (for pilot). Com Audio = hphone