Fundamental over load on 40 Meters

[Whitney Carter]

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

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[Geoffrey Mackenzie-Kennedy-2]

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" <[hidden email]>
To: <[hidden email]>
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
>

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[Tom Althoff]

With the new 2.04 upgrade I now have RTTY as a mode.  Are the BFO settings
tied to the USB/LSB with a fixed offset or can the RTTY BFO settings be
adjusted too?

If so, does anyone have sample RTTY and Inverted RTTY BFO freq values?

Thanks!

Tom K2TA

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[Don Wilhelm-3]

Tom,

The RTTY mode provides a full set of filter options (4 filter bandwidths)
and with RTTYr mode (like CWr) you have a total of 8 BFOs to use.  Remember
that the BFO for FL1 is always used for transmit.  You can copy the settings
for SSB (or CW for that matter) to get things started, and then refine them
as you wish for whatever audio range you wish to de-modulate (use
Spectrogram and a wideband noise generator).

Additional benefit of the RTTY mode - the setting of the mic gain and
compression (SSBA snd SSBC) are independent of that used for SSB.

73,
Don W3FPR

----- Original Message -----

> With the new 2.04 upgrade I now have RTTY as a mode.  Are the BFO settings
> tied to the USB/LSB with a fixed offset or can the RTTY BFO settings be
> adjusted too?
>
> If so, does anyone have sample RTTY and Inverted RTTY BFO freq values?
>


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[Brian Mury-3]

On Sat, 2004-06-11 at 09:37 -0500, W3FPR - Don Wilhelm wrote:
> Additional benefit of the RTTY mode - the setting of the mic gain and
> compression (SSBA snd SSBC) are independent of that used for SSB.

I'm pretty sure that's only true for compression, not mic gain.

--
73, Brian
VE7NGR

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[Don Wilhelm-3]

Brian,
You are so correct - my slip
73,
Don W3FPR

----- Original Message -----

> On Sat, 2004-06-11 at 09:37 -0500, W3FPR - Don Wilhelm wrote:
>> Additional benefit of the RTTY mode - the setting of the mic gain and
>> compression (SSBA snd SSBC) are independent of that used for SSB.
>
> I'm pretty sure that's only true for compression, not mic gain.
>


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