[Elecraft] K3/0 to K3/100 RemoteRig transmit audio problem

[Craig - AE6RR]

Thanks to all that replied off list with suggestions.  The problem is fixed.
It was actually two problems.  The first and most severe was RF feedback
into the transmit audio.  I put a ferrite on the mic cable from the Radio
RRC box to the K3 and that helped some, but reducing power to about 15 W
cured it.  It also disappeared when I tested with a dummy load.  Then I need
to adjust the codec gain values on the Radio RRC.  The audio now sounds
great.

I am not sure if I had RF pickup in the Control RRC or the Radio RRC or
both.  I am going to deploy the system to the remote site and see how it
works there with an antenna that is farther removed than my stealth antenna
at home (that's why I need a remote site).  I will also be using an amp at
the remote site.

The supplied mic cables in the cable kits are made with a couple of feet of
CAT-6 Ethernet cable and a mic and PTT cable spiced on the end.  I am
thinking about making a new one for the radio end with shielded CAT-6 and
see if that helps.  The RJ-45s on the RRC boxes are the shielded types so I
will get a grounded shield on that end.  The next question will be if I
should connect the CAT-6 shield to the mic and PTT shields at the splice
point.  I may need to experiment with that.  I also have a supply of
ferrites (bit ones) to play with.

73,
- Craig, AE6RR


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Craig - AE6RR
Sent: Friday, November 16, 2012 9:35 AM
To: Elecraft Reflector
Subject: [Elecraft] K3/0 to K3/100 RemoteRig transmit audio problem

I am using a K3/0 and a K3/100 with the RemoteRig boxes.  I have the
standard versions as sold at HRO not the ones with the special microphone
jumper module.  I jumpered the mic connections as shown in the RemoteRig
manual on page 193 and I have horrible digital noise on my transmit audio
even with a microphone plugged directly into the control RemoteRig box.  The
PTT does work OK.

 

Any ideas on this one?

 

73,

- Craig, AE6RR

 

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