REFLECTOR: Avionics wiring - SL-30 to GMA 340

[NMFlyer1 at aol.com]

Al, 

  After completing the Tax Headache, I reread your post on wiring. 

I take it you are getting 100 Ohm when reading resistance from pin 7 to pin 
13 thru the SL30. 

Since you are measuring thru the unit, you really don't know what you are 
measuring. Keep in mind that when you "KEY UP" you are tripping a circut that 
temporarily blanks out the receiver (else you get some wicked feedback). The old 
radios used to do this with a mechanical relay, the new ones with a 
transistor. So, once you key up ( with power on)  the readings will likely change. 

I did what it seems you did:  Match up the pin connections so that you get 
them right. It is very common to JUMP across grounds in the back of a "D" 
connector, since NOT doing so would add a LOT of wire. 

Some additional input I can add is : sometimes they wire the transmit key 
directly to the mic ground. YOu don't want that because it will require the use 
of one of those ugly aftermarket mike key switches. 

I ended up (after double checking with the manufacturer) running my mik-key 
thru my stick grip PTT, then to ground. Leaving the connection from mik-to-mik 
ground open. That way, the PTT works. 

That is what I remember off the top of my head. If you like I can go out and 
check the actual connections on the back of the "D" connectors. My panel is on 
the bench while I finish up installing ship's power and the tru track auto 
pilot. 

Hope it helps.    Kurt
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