[Elecraft] Strong Rd feedback in mh3

[Edouard Lafargue]

  Thanks everyone! Good advice. Now that I have better Internet access
again (btw I meant "RF" not "Rd" in the subject line, of course), I
discovered this article on ... elecraft.com :
http://www.elecraft.com/Apps/eliminating_tx_rf_feedback_probl.htm   :-)

   I will experiment with less random lengths for my random wires, and
better counterpoises, and a small balun if necessary.

73 de ed w6ela

On Sun, May 29, 2016 at 2:05 PM, Wayne Burdick <n6kr at elecraft.com> wrote:

> Also try a QRP balun at the radio, such as our BL1 or BL2.
>
> 73,
> Wayne
> N6KR
>
>
> On May 28, 2016, at 8:43 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:
>
> > Ed,
> >
> > Yes, that can be common with long wire antennas - that can happen with
> any transceiver, it is not unique to the K3 or KX3.
> >
> > Change the length of your long wire by 1/8 wavelength at the frequency
> you are having trouble with.
> >
> > The situation is that you have a high RF voltage on that antenna near
> the shack end.
> > Even though the tuner can match it, it can produce a strong RF Field in
> the shack.
> >
> > 73,
> > Don W3FPR
> >
> > On 5/28/2016 11:17 PM, Edouard Lafargue wrote:
> >> I was operating portable today, with a long wire in a tree  and
> >> counterpoise on the ground, and no matter what I did, every time I
> pushed
> >> the mic button, I got super strong RF feedback in audio monitoring,
> >> apparently picked up by the MH3 cable - things got slightly better if I
> >> tried to bunch/coil the MH3 cable. Is this common?
> >>
> >> I only managed to work one station in Indiana in the time I tried, most
> of
> >> the time what I heard in my headphones while transmitting was
> >> unintelligible garble, so it is no surprise others didn't hear me, I
> >> guess...
> >>
> >> My KX3 has got an internal ATU and it managed to match the long wire
> >> perfectly at each frequency I tried to operate...
> >>
> >>
> >
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