[Elecraft] K3 & Beringer HA400

[Dick Dievendorff]

Does it vary with power output or with Tx Test? Could it be an RFI issue?  I
was also unhappy with the audio on my HA400.

Dick
K6KR


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Steven Pituch
Sent: Monday, November 16, 2009 2:13 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 & Beringer HA400

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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