REFLECTOR: Avionics wiring - SL-30 to GMA 340

[Al Gietzen]

I'm running into some uncertainties in wiring up the panel, and am not
getting answers from the manufacturers or vendors, each referring me to the
other.  I'm connecting the SL-30 as COM 1 to the Audio Panel.

 

GMA340 has: COM 1 in - pin9; COM 1 return - pin 10

                     COM1 mic - pin 11; COM 1 key - pin 12

 

SL30 has: Headphone out - pin14; Headphone grnd - pin 13 (called audio
ground)

                Mic 1 - pin 8; Transmit key - pin 4; and mic ground - pin 7.

 

I'm going: SL pin 14 to GMA pin 9; 

       SL pin 13 to GMA pin 10;

                 SL pin 8 to GMA pin 11;

                 SL pin 4 to GMA pin 12.  What happens with SL pin 7?

 

Since the GMA has only pin 10 as "return" that must serve as "grnd" for both
headphone and mic.  I measure 100 ohm between pin 7 and pin 13 on the SL30
suggesting its expecting something different for mic and headphone return.
Do I jumper pin 7 to pin 13? Or do I have already have something else wrong.
I'd expect these two are fairly common units that get connected together -
anybody do it??

 

Thanks for any help,

 

Al (only more complicated than glass panel wiring is the income tax code -
a-r-r-gh!)

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