[Elecraft] K2 PLL temp upgrade - problem

Sat May 3 21:37:02 2003

No typo, although RP3 is replaced by the upgrade board.  In early K2s
with 100K RP2s, it is necessary to add a couple of resistors across
parts of RP2.

Bob, N7XY

On Sat, May 03, 2003 at 05:54:07PM -0400, David A. Belsley wrote:
> Dave:
>  I hope your messages have had typos, because it is RP3, I believe, that 
> is involved in the PLL temp upgrade, not RP2.
> 
> best,
> 
> dave belsley, w1euy
> 
> --On Saturday, May 3, 2003 6:11 PM +0100 Dave <[email protected]> wrote:
> 
> >Further to my last... If I read the upgrade instructions more carefully
> >and checked in my K2 original manual, then I would have realised RP2 in
> >my K2 is 82K and not 100K of the earlier models. I've removed the 10 K
> >resistors from pins 1/2 and 3/4 and now my K2 performs as per the
> >instruction sheet.
> >
> >The instructions may need clarification on this point?
> >
> >Just awaiting the K2 warming for a few minutes to do a proper CAL PLL.
> >
> >Dave, G4AON
> >K2 #1892
> >
> >----- Original Message -----
> >From: "Dave" <[email protected]>
> >To: <[email protected]>
> >Sent: Saturday, May 03, 2003 5:46 PM
> >Subject: [Elecraft] K2 PLL temp upgrade - problem
> >
> >
> >>Hi gang
> >>
> >>The modification kit arrived in this mornings post. All went well until I
> >>came to alignment and test.
> >>
> >>Connecting frequency counter probe to TP3, CAL Fctr and tapping BAND-
> >gives
> >>a counter reading of 12083.71, pressing BAND+ gives an unstable reading.
> >>
> >>Setting the K2 to 7000.1 KHz and connecting the counter probe to TP1,
> >>running CAL PLL gives an initial reading of 11042.35 (approx.) and then
> >>shows a "INFO 232" error.
> >>
> >>I can confirm that all supplied resistors measured their specified
> >>values, L31 has been fitted and is marked 12uH, the BFO modification had
> >previously
> >>been carried out, there is a 2K7 resistor across pins 7 & 8 of RP2, 10 K
> >>resistors have been added across pins 1 & 2 and 3 & 4 of RP2 and that X1
> >has
> >>been replaced with the one supplied.
> >>
> >>I've checked the VCO alignment as per the manual (DVM to R30) and checked
> >>that the K2 receives on all bands on more or less the correct dial
> >>reading (error of about 3 KHz on 7 MHz and worse higher up due to not
> >>being able
> >to
> >>run CAL PLL).
> >>
> >>Other than asking for a replacement RP2 and reversing the modification,
> >any
> >>ideas appreciated.
> >
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> 
> 
> 
> ----------------------------------
> David A. Belsley
> Professor of Economics
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-- 
Bob Nielsen, N7XY                          [email protected]
Bainbridge Island, WA                      http://www.n7xy.net
IOTA NA-065, USI WA-028S 