[Elecraft] Microphone ground

Don Wilhelm w3fpr at embarqmail.com
Mon Oct 13 17:27:16 EDT 2008


Lew,

The mic cable shield should be connected to the shield of the mic plug, 
and in turn the mic jack shell should be connected directly to the 
enclosure by a very short path.  Unfortunately, that does not happen in 
most ham gear constructed on PC Boards - it is easy to connect the shell 
to the board ground, but that is the wrong place, it really should 
connect directly to the metal enclosure for best RF prevention.  See Jim 
Brown's (K9YC) frequent posts referencing 'the pin 1 problem'.
The shield should not be used for any of the signal returns.  Normally 
the PTT return connects to pin 7 and the AF return connects to pin 8.

lew wrote:
> 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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