[Elecraft] K2 PLL temp upgrade - problem

[Dave]

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" <dave@astromag.co.uk>
To: <Elecraft@mailman.qth.net>
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.