[Elecraft] K2 PLL temp upgrade - problem

Sat May 3 17:58:01 2003

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.
>
> _______________________________________________
> Elecraft mailing list: [email protected]
> You must be a list member to post to the list.
> Postings must be plain text (no HTML or attachments).
> See: http://mailman.qth.net/mailman/listinfo/elecraft
> Elecraft Web Page: http://www.elecraft.com

----------------------------------
David A. Belsley
Professor of Economics