[Elecraft] K3 & Beringer HA400

[Don Wilhelm]

Steve,

Just an idea - have you tried it on LINE OUT?  It may be that you are 
overdriving the input of the Beringer.
The other possibility is that you have an RF in the Shack problem and 
the Beringer is reacting to the RF.  Try it when connected to a dummy 
load or in TX TEST.  If that 'fixes' the problem, you have some antenna 
work to do to keep the stray RF out of the shack.

73,
Don W3FPR

Steven Pituch wrote:
> Hi All,
> I tried using these two items together and am getting scratchy audio in the
> headphones when I speak on USB even though the monitor is set to zero.  When
> I use the rear headphones out to feed the HA400 it is really bad and loud.
> When I use the front headphone jack its medium loud but still not right.  It
> can be heard on my transmitted audio.
>
> I tried using a battery to power the HA400 to isolate the ground but it has
> no effect.  I did the "Modification Improving the Immunity of the Rear-Panel
> RS232 and Audio Connectors to RF" mod, and checked to be sure that the
> "Front Panel Microphone Circuit" mod had been done at the factory.  I tried
> also using RG 174 for the audio feed.  No change.  I also removed the serial
> cable and had no change.
>
> Any suggestions would be greatly appreciated as I do need to have four
> headsets on the K3 for various ham demos.
>
> 72 and thanks,
> Steve, W2MY
>
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