[Elecraft] K3 Monitor feedback

[O. Johns]

Dear Mike,

Maybe you have solved this by now.  But, if not, my experience might be helpful.  I also noted a sort of rough feedback when listening to the monitor.  In my case it was RF feedback.  Maybe you have had a rough SSB signal for some time and the monitor just revealed it to you?  

Anyhow, as Don Wilhelm says, the best thing is to look at your antenna feed situation to try to minimize feedback.  In my case, this was effective except on 20 meters.  Due to physical constraints that I can't change, my dipole antenna passes about 15 feet above the table with my K3 on it.  As it happens, on that one band, there is lots of RF around.  Maybe one of the power lines is resonant, don't know.  Anyhow, I tried lots of ferrite beads on various lines, which reduced but didn't eliminate the problem.  Finally, and this is my suggestion to you, I put a ferrite bead right at the end of the mike boom, just before the mike itself.  This killed the RF feedback for me.  (This is using the Yamaha CM500 headset that was written about earlier on the reflector.)  Evidently the mike element itself is sensitive to RF.

Hope you've solved your problem by now.

73,
Oliver, W6ODJ



On 25 Nov 2009, at 6:01 PM, Mike wrote:

> I was playing with ALC and compression settings tonight, and turned on 
> the monitor function. If I turn it up high enough to hear myself (around 
> 9), I get a loud BRRRRRRRRRR squeal, that has an echoic component. 
> Difficult to describe.
> 
> I don't recall hearing that when I first set up the mic. I have V3.63.
> 
> How can I regain use of the monitor?
> 
> Mike NF4L
> 
> To those who celebrate tomorrow, Happy Thanksgiving.
> 
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