[Elecraft] A to B mods help please

[David A. Belsley]

Dan:
  The two are just two ways of saying the same thing.   Set your 
frequencies back to their original position, not the contol values.

best wishes,

dave belsley, w1euy

--On Wednesday, March 5, 2003 10:00 AM +0930 Dan Holloway 
<dan.marion1@optusnet.com.au> wrote:

> Hello,
>
> I'm not ashamed to admit it, I need some advise with my K2 mods.
>
> After completing the K2 A to B mods and installing the latest firmware, my
> attempts to realign my K2 (s/n 2469) are proving to be challenging.
>
> On the A to B sheet (Jan 4, 2002), page 5, I recorded my original filter
> settings in Table 5.
>
> 1.  On the A to B sheet, page 12, last step, my attempts to reset my
> original BFO values from Table 5 are the problem; the BFO Control
> Parameter and the BFO frequency interact and, in my vain attempts to
> reset them to my original values, I end up going in circles.  Changing
> one changes the other. In the end, I just entered the pre-mod BFO
> frequencies (as the step says) and ignored the resulting BFO Control
> Parameters.  Is this the correct procedure?
>
> 2.  Also, on the same page 12, fifth step, I found that the BFO Low
> frequency was too high (range was good) and it was necessary to add the
> two capacitors mentioned in the next step.  The resulting BFO Low was just
> slightly too high (4912.75 kHz) and I attribute that to a possible counter
> error.  The range is good (4.10 kHz).  Listening to WWVH (15 MHz), the
> frequency readout is very close; am I thus correct in assuming that the
> K2's counter is not grossly inaccurate?
>
> 3.  The PLL osc. is also too high (12096.81 kHz).
>
> 4.  It is now not possible to set S HI (S-meter).  S LO is normal.
>
> I mention items 2-4 only in case they might somehow be related to item 1,
> the main "problem".
>
> Can anyone advise me if I am doing something wrong here?  Perhaps I am
> only supposed to reset the BFO frequencies for each filter and, as I've
> done, ignore the BFO control parameters.  Is it normal for the BFO
> parameters and frequencies to interact?  Are the BFO Control Parameters
> used at all in aligning the K2's filters?  If not, I suppose that is the
> answer and my "problem" is solved.
>
> Thanks in advance.
>
> 73 de Dan
> VK8AN (K6KMD)
> K2 #2469 + KPA100 ready to build
>
>
>
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----------------------------------
David A. Belsley
Professor of Economics