[Elecraft] Fundamental over load on 40 Meters

[Geoffrey Mackenzie-Kennedy]

Morning Whitney,

Do you find any spurii below 7000 kHz, say at 6990, 6980 Khz etc? And do the
spurii go down in strength as you go from 7000kHz up (or down)?  Is there
only one "offending" BC station, and what is its frequency?

I have a little of the same problem, but only at approx 7020kHz, when using
2 el 40m beam.

Geoff    GM4ESD


----- Original Message ----- 
From: "Whitney Carter" <lakewood at direcway.com>
To: <elecraft at mailman.qth.net>
Sent: Friday, November 05, 2004 7:36 PM
Subject: [Elecraft] Fundamental over load on 40 Meters


> I have K2 number 4352.  Finished it over the summer.  Used with mediocre
> antennas to test out how it worked.  All FB.  Just moved my 2 element 40
> meter beam up to 70 feet.  Conditions on the band have been very good, and
> alas I get a signal every 10 KHz from 7000. KHz on up to 7060. KHz.
Thought
> it was local problem.  So I checked my Ten Tec 555, same thing.  I heard
the
> signals on exactly the same frequencies.  Switched to the Pro II and no
> harmonic signal over load every 10 KHz.  I know the AM SWL band could do
> this, or a very strong signal on the 40 meter band itself.  I am copying
> some signals over the pass few days at 40 and 60 db over s9.  Switched the
> K2 to the 80 meter dipole and the signals (signal) almost vanishes, and
the
> rest of the band looses about 5 S units.  The K2 benefits from switching
the
> pre amp off, but still see the harmonic on those same frequencies.  I'll
> keep checking each day.  Maybe the SWL station will move, or end it's
> transmission.  My questions are:  Is this normal for the K2 on 40 meters
> under these conditions?  Is there something I should re-check or maybe
> re-tune the band pass filters?  Any suggestions would be appreciated.
>
> Whit K1EO
>