[Elecraft] RFI in audio chain

[Joe Subich, W4TV]

> And the shield should be connected at one end only, preferably the
> signal receiving end or mike connector at the radio. That way, there
> is no current flowing on the shield.

*Except* with a transmitter.  Connecting the shield to one side of the
mic element provides a path for any common mode current reaching the
rig directly *into* the mic circuits!  *NEVER* connect the shield of
any mic cable to the mic return - it only makes any "pin 1 problem"
much worse.

73,

   ... Joe, W4TV


On 11/22/2015 9:20 PM, Bob McGraw - K4TAX wrote:
> Oh but it is.  There is pin #1, pin #2 and pin #3 plus a ground
> terminal.  The cable between the mike and radio should be 3 conductor
> shielded.  Thus  - Red, Black, White and shield.  And the shield should
> be connected at one end only, preferably the signal receiving end or
> mike connector at the radio.  That way, there is no current flowing on
> the shield.
>
> 73
> Bob, K4TAX
>
> On 11/22/2015 8:07 PM, Bill wrote:
>> Make sure your mic wire's shield is properly grounded (both ends) -
>> remember, XLR was not designed for RF use.
>
>
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