[Elecraft] KX3 AM-breakthrough

[WM3M]

This happens to my KX3 too, but only sometimes, and I can not duplicate it.
I have not been able to track down what causes it.
I use wire antennas fed with coax, OCF dipoles and double size G5RV, it has 
done it on all 3 antennas.
When the AM breakthrough happens it is very loud and can be heard across the 
entire 20 mtr band.
But then it will go weeks and not do it?
First few times it happened I spent couple hours tracking down the AM 
station, it was a independent AM broadcast station, I believe in Kentucky, 
very strong somewhere around 9 Mhz?
If anyone figures it out please let me know.
Emory  WM3M

-----Original Message----- 
From: Klaus Dittrich
Sent: Monday, July 29, 2013 5:49 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KX3 AM-breakthrough


My KX3 when driven by a allband shortwave antenna
shows am-breakthough at all bands above 30M
depending on conditions.

The source are far shortwave broadcast stations
(relative to Germany),
Iran, Pakistan, India and sometimes Deutsche Welle.


The stations hearable then are different each time
and very loud, S4 to S5, and so disturbing that working
in cw is impossible for me.

The antenna I use is an asymmetrical dipole(30m/40m long), tuned
at the feedpoint by an SGV-230 autotuner and works well at all bands
from 160m to 6m.

The KX3 is designed as a portable trx. Outdoors people
will use the long antennas which they have no room for at
home.

It seems the KX3-RX can not withstand the rf-levels
delivered by such long antennas.

ARLL and Sherweng measurents do not capture the situation
thus showing that measurements at best always do picture
only a part of reality.

Is Elecraft working at this problem and is there a solution
at the horizon?

-- 
73, Klaus DF1TL

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