[Elecraft] Microphone ground

[Joe Subich, W4TV]

Lew, 

The Elecraft documentation shows the mic ground connected 
to pin 7, the PTT ground connected to pin 8 and both pins 
connected to chassis ground through a common RF choke.  

In some stations, the common RF choke results in common mode 
RF (also known as a "Pin 1 problem") feedback. 

The proper connection would be: mic return to pin 7, PTT 
ground (chassis) to the SHELL of the Foster plug and the 
SHIELD of the mic cable to the SHELL of the Foster plug. 
The mic cable SHIELD should NOT be connected to the MIC 
element (it should connect to the CASE or float). 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of lew
> Sent: Monday, October 13, 2008 12:34 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] Microphone ground
> 
> 
> Does the Elecraft require a microphone ground as well as the usual 
> ground for its microphone connector? If so, should it go to 
> to pin 7 or 
> 8 on the  Elecraft mike connector? If not, are both ground 
> connections 
> necessary to be made to pins 7 & 8 in the connector?
>    Thanks,
>   Lew  W7EW
>  #1560/1561
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