[Elecraft] KX3 need microphone help

[Don Wilhelm]

Where did you add the common mode choke?  What is the choking impedance 
of that common mode choke?  Take a look at the writings of Jim Brown 
K9YC for effective common mode chokes.

The fact that you do not have the problem with the MH3 microphone 
strongly suggests that there is not a problem with the KX3 or KXPA100.
Both microphones you mentioned are dynamic type and should have Bias 
turned off.

You might check the coax connections and your coax jumpers.  PL-259 
connectors should be fully seated and be given just a bit more 
tightening than "finger tight" to make an effective connection to the 
coax shield.  Use pliers to snug them up a bit after making them finger 
tight.
Try different coax jumpers - it is not uncommon to have the connection 
to the shield fail.

73,
Don W3FPR

On 12/30/2015 7:31 PM, Jim Kutsch, KY2D wrote:
> I'm running a KX3 and KXPA100 here. Both are very early units but with the
> latest firmware. All is fine with the Elecraft hand mic but I want  to use a
> boom mic and foot switch. However, I'm having problems with two different
> mics. In both cases, when power is set to more than 50W, the audio is
> distorted. This happens with the Carolina Windham, the hex beam, and even on
> a dummy load. I added a common mode choke but it didn't help.
>
>   
>
> The mic with the problem is an Electrovoice RE15 on a boom with its XLR
> connection going into a HOSA splitter cable, TRS on the KX3 side and two XLR
> connectors on the other. Thinking this old Electrovoice might be the
> problem, I also tried a non-amplified D104 upgraded with a Heil HC5 element.
> It's connected with a TRRS patch cable cut and hard wired into the D104
> base.
>
>   
>
> The problem remains regardless of mic bias on or off and mic buttons on or
> off. Anyone have any ideas? Or, can anyone recommend a mic and cabling
> solution I can buy?
>
>   
>
> Thanks and 73, JIM, KY2D
>
>   
>
>   
>
>   
>
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