The preferred method of padding the BFO capacitors is to maintain the ratio
between C173 and C174 by paralleling them with capacitors. A single
pitfalls. If you would like further documentation on padding the BFO,
> -----Original Message-----
>
> All the components look right. I guess I've got the dreaded high
> Q crystals. I've noticed in the Elecraft archives that it is
> possible to put a capacitor at the junction of X3/X4 to ground.
> Which is the preferred method?
>
> Thanks.
> >
> > From: "Don Wilhelm" <
[hidden email]>
> > Date: 2005/12/07 Wed AM 09:30:04 PST
> > To: <
[hidden email]>,
> > <
[hidden email]>
> > Subject: RE: [Elecraft] K2 BFO Test
> >
> > Ted,
> >
> > Yes, you should get the BFO range and frequency correct - you
> can continue
> > with no extra effort, but it must be resolved eventually, and
> there is no
> > time like the present to do it.
> >
> > Check the values of the capacitors C173 and C174, and while you
> are at it,
> > check C169 too. Additionally, check the varactors D37 and D38 for the
> > correct type (1SV149 - the smaller ones) qne proper
> orientation. Be certain
> > the BFO crystals were the ones you soldered in - they are
> typically marked
> > ECS D4.91 -S
> >
> > If you find all the above correct, you may have to pad
> Capacitors C173 and
> > 174. Should that become necessary, use 47 pf in parallel with
> C174 and 120
> > pf in parallel with C173. The padder capacitors will lower the low
> > frequency end more than the high frequency end of the range, so
> it should
> > work for you - but do the padding only if there is nothing else
> wrong with
> > the components.
> >
> > 73,
> > Don W3FPR
> >
Subscriber Info (Addr. Change, sub, unsub etc.):