Posted by
Geoffrey Mackenzie-Kennedy-2 on
Jan 16, 2005; 8:12pm
URL: http://elecraft.85.s1.nabble.com/Birdie-at10m-a-choice-between-a-turkey-and-an-ostrich-tp373605p373610.html
Evening Sverre,
Agree with what you say, but I get a strong birdie at 28.276 without the
KPA100 on. This one I think is LO + BFO , that is 23.361 + 4.915 = 28.276,
nominal freqs. Being first order it is also strong. Other products + mLO +/-
nBFO also converge here, but are not a problem in my K2.
There is no spur at 28.262 MHz with the KPA100 on as its crystal frequency
is 16,289 MHz (later build?). But that oscillator might be contributing to
the other spurs. I have yet to sit down and do a worst case analysis.
73, Geoff GM4ESD
----- Original Message -----
From: "Sverre Holm" <
[hidden email]>
To: "'Marinos Markomanolakis, M.D.'" <
[hidden email]>;
<
[hidden email]>
Sent: Sunday, January 16, 2005 1:43 PM
Subject: RE: [Elecraft] Birdie at10m: a choice between a turkey and an
ostrich!
> -----Original Message-----
> In my case, I want to think of the birdie living in my K2/100 as a
> substantially bigger one, a turkey (with the K2100 enabled -power >11w) at
> 28.266 (USB).
>
> --------------------------
>
> This birdie is an image of the 18432 KPA100 oscillator since 18432 +
2*4915
> = 28262. This is why it is so strong also.
>
> If the KPA100 X-tal is exchanged for a frequency outside of the range
given
> by:
> 28000-2*4915 = 18170 and
> 29700-2*4915 = 19870 it will no longer fall in the 10m band, but I cannot
> give any guarantees against other, probably weaker, birdies appearing.
>
> Old 10 Mbps ethernet cards usually have 20000 kHz crystals so that could
be
> a source for a crystal to test.
>
> 73
>
> Sverre
> LA3ZA
>
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