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
> 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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