[Elecraft] BFO Mod

Thu Dec 12 10:47:00 2002

Hi

The only place you remove a crystal is X2 in the PLL reference oscillator.
The BFO needs all of the crystals to have enough range. The drift in the BFO
was in the toroid and that is corrected with the new pre-wound toroid L33.
You may have seen a note about adding a cap in the BFO to get more range but
that was with both crystals.

Don Brown

----- Original Message -----
From: "Helmut Usbeck" <[email protected]>
To: <[email protected]>
Sent: Thursday, December 12, 2002 8:25 AM
Subject: [Elecraft] BFO Mod

> I installed the BFO mod, l33 and R116.  So far so good.  I seem to
> remember that for even less drift to remove X3 or X4, not to be confused
> with the removal of X1-X2 pll Xtal.
> Anyhow in removing either X4 or X5 I get only a 1.8 khz spread, instead
> of 3.6 khz or better.  Of course the BFO mod sez nothing about removing a
> xtal but I though several of you out there tried it and gained a bit more
> stability.  Do I add a cap or two somewhere or should I just leave it with
> 2 xtals installed.
> Regards
> Helm.  WB2ADT
>
>
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