REFLECTOR: Avionics wiring - SL-30 to GMA 340

[Terrence Miles]

Whoops.missed who that msg was for.sorry
Terry
 
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Al Gietzen
Sent: Wednesday, April 13, 2005 1:23 PM
To: reflector
Subject: REFLECTOR: Avionics wiring - SL-30 to GMA 340
 
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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