[Elecraft] K3: 6M SSB audio hash

[James C. Hall, MD]

Bob:

 

As a follow up, I doubt it's the Goldline mic/cable itself, as I get the
same hash with a Heil headset plugged into the switcher. 

 

73, Jamie

WB4YDL

 

  _____  

From: bob at n9rs.com [mailto:bob at n9rs.com] 
Sent: Friday, June 06, 2008 4:42 PM
To: James C. Hall, MD
Subject: Re: [Elecraft] K3: 6M SSB audio hash

 

You found out that the hash is not coming from rf on the line.  Try the
Goldline mic direct.  Then add the switcher (or equalizer).  Then add the
other one.   See when the hash shows up.  This may help you narrow the
problem down.

-----Original Message-----
From: James C. Hall, MD [mailto:nwtcc at earthlink.net]
Sent: Friday, June 6, 2008 04:27 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3: 6M SSB audio hash

Hello: I've noticed some audio hash on my SSB signal on 6M only when the PA
relay kicks in at 13 watts. My long microphone cable goes to a
Multi-Switcher -> W2IHY Noise Gate/Equalizer -> Heil Goldline microphone.
This completely disappears when I use a Kenwood hand mike direct to the K3.
Thinking that this was a classic "RF on the line" problem, I clipped on
multiple ferrite chokes with many turns on the cable coming from the K3, the
Goldline mike, and in between the switcher on noise gate. This didn't even
slow it down ! Hmmm. Interestingly when the PA relay is off at 8 watts,
there is absolutely no hash. For now, I'll just use the hand mike on 6M
(which requires a bit more mike gain) to keep a clean signal. Has anyone
else noticed this ? Got a solution ? 73, Jamie WB4YDL
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Version: 8.0.100 / Virus Database: 270.0.0/1487 - Release Date: 6/6/2008
8:01 AM