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?
>
> 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
>
> > -----Original Message-----
> >
> > I am in the process of testing the BFO on page 62. Everything
> > tested fine up to this point but now I can not get the proper BFO
> > range. The BFO high frequency is 4917.56 and the BFO low
> > frequency is 4914.26. This provides a BFO range of 3.2 kHz. It
> > appears that I can not the the BFO low frequency below 4912.7 as
> > specified in the manual. I checked L33 to make sure R116 is not
> > shorting any turns. Should I troubleshoot this problem before
> > proceding? If so where else should I look. Thanks.
> >
> > Ted K6OI
> >
>
Subscriber Info (Addr. Change, sub, unsub etc.):