[Elecraft] Re: Help with Birdie (not "tweet tweet!")

Fri Mar 21 17:23:03 2003

My K2 S/N >3000 has a strong birdie at 28706.18 and 14360.88.  The one at 28
tunes double speed, the one at 14 tunes normal speed.  Configuration: K2,
KNB2, KSB2, KAF2, KPA100 (includes RS232 I/O).  I wonder if the radio
configuration makes a difference?

73 de NA8M
John

----- Original Message -----
From: "Ron D'Eau Claire" <[email protected]>
To: "'Elecraft'" <[email protected]>
Sent: Friday, March 21, 2003 2:43 PM
Subject: RE: [Elecraft] Re: Help with Birdie (not "tweet tweet!")

> Good points Mike, but my K2 does NOT have the birdie Dave is hearing...
>
> BUT, Dave K2 S/N > 3000. Mine is a pre S/N 3000 and I believe the others
> replying were too. So it is slightly possible that there was something in
> the changes to the RF board that have allowed a birdie to become audible
> that wasn't in the earlier units...
>
> Also, Dave reports being able to get frequency changes tapping almost
> anywhere in the general area of the PLL Reference Oscillator. I can only
get
> slight changes by touching the frequency-sensitive components themselves,
> and that only a slight shift in the frequency.
>
> Ron AC7AC
> K2 # 1289
>
> -----Original Message-----
> I think we're going off on the wrong route here.  It's nothing to do with
> bad joints, wobbly components, instability and all.  Bashing a frequency
> determining components around the VCO is bound to change the frequency,
that
> isn't necessarily the issue.  Squeezing the case causes the BFO to move.
>
> Birdies are a consequence of the necessary mixing required to convert the
RF
> to audio....
> Mike VP8NO
>
>
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