[Elecraft] Audio feedback

[Edward R Cole]

Dick,

You did not indicate if the feedback is in the internal K3 speaker or 
an external speaker.  I have no problem with my K3 using an ext. spkr 
(but that is because it is unamplified 1950's era National 8-inch speaker).

I do get audio feedback with my KX3 because I am using cheap computer 
speakers that are prone to RF rectification in the amplifier.  I have 
to run the speaker volume down if I operate 300w on HF or 6m.  That 
requires running the KX3 volume too high for my tastes (tends to 
become distorted at the high end).  I like running a combination 
volume settings where the volume in the KX3 is set about 8-12.

So back to my point that cheap amplified speakers can be subject to 
stray RF in the shack.  My 300w amp is still open-air and not 
enclosed in a cabinet (which would also help reduce feedback in my 
wife's FM radio in her hobby room next to the shack).  I bought her 
the West Mountain speaker for her computer and it is totally free of 
RF pickup; I'll be getting a pair for my KX3 sometime this 
winter.  Also buying an enclosure for the 300w amp including 
bypassing of the dc and control lines.

But first checking monitor setting is a good idea.  I've had that 
happen a time or two going between CW and SSB.

73, Ed - KL7UW

----------------------------
From: Dick Brown <richardjoanne at comcast.net>
To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Subject: [Elecraft] Audio feedback
Message-ID: <DC821876-FDD9-461C-9171-03A488492CB5 at comcast.net>
Content-Type: text/plain;       charset=us-ascii

I am getting audio feedback via the speaker when I transmit on 
K3.  What's a way to solve this.
KT6X


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
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