[Elecraft] RF in Microphone

[Joe Subich, W4TV]

Heil's quality control *sucks*.  Their cables are notorious for
reversing mic return and chassis ground (shield/PTT return) and/or
connecting the mic return to the shell of the Foster plug instead
of the mic return pin.

Use an ohm meter and make sure that pin 1 of the XLR (shield/shell)
is connected to the *shell* of the Foster plug and pin 3 of the XLR
(mic return) is connected *only* to pin 7 of the Foster plug.

Connecting pin 7 of the Foster plug to the shell (particularly at
the XLR end of the cable) is a sure fire way to make any RFI problem
in your shack/installation exponentially worse.

73,

    ... Joe, W4TV


On 3/26/2017 12:31 PM, Jim Kutsch wrote:
> I am a new K3S owner and very pleased. However, on SSB, I am getting reports
> that my audio is distorted sounding like RF is getting into the microphone.
> I'm using a Heil PR-781 with the XLR3 to 8-pin microphone adapter cable. I
> had some RF microphone issues earlier using the PR-781 with a KX3 but a
> better shielded mic cable and a common mode choke resolved it. Any
> suggestions before I go in search of a different mic? Also, any
> recommendations for a boom mount microphone that would be a better choice
> for the K3S than this PR-781?
>
>
>
> Thanks and 73, Jim, KY2D
>
>
>
>
>
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