Correct Andrew. Even if it is a 10K RP you'll still want to add R19.
I just got done fully upgrading a field test K2 here and had 100K stuck
in my head. But it is the same whether 100K or 10K RP's.
73,
Dave, W8FGU
On 7/22/2022 10:52:06 AM, "Andrew Moore" <andrew.n...@gmail.com> wrote:
Hi Dave -
My s/n 892 currently has RP2 = 10k, not 100k. Does the 2.7k still need
to be added across pins 7 and 8?
From the PLL Ref Upgrade kit docs (E850138), it sounds like it might
need to be added regardless of 10k/100k, as the first step below
doesn't differentiate, while the next step does:
[_] If your K2 serial number is lower than 3000, make sure you have
installed the BFO modification (BFOMDKT). One of the items supplied in
this kit is a 2.7-k resistor. This resistor, designated R19, must be
soldered across pins 7 and 8 of resistor network WP2 (in the PLL area).
[_] If you have an older K2 (early revision A for Field Test), you may
have a 100k resistor network installed at RP2, which is in the VCO
area. If so, you'll need to solder two 10k to 12k resistors across RP2,
which can be difficult...
Thanks,
-Andrew NV1B
..
On Fri, Jul 22, 2022 at 9:30 AM Dave Van Wallaghen <d...@w8fgu.com>
wrote:
Hi Andrew,
Yes, place that 2.7KΩ resistor across RP2 pins 7 & 8. This resistor is
on the output of U6A to drive the varactor diodes in the PLL
Osciillator
circuit. It was changed to 2.7K in Rev B. In Rev A it was 100K and
part
of RP2, so you are just placing a 2.7k resistor in parallel with the
100K on RP2 P& and P8. I believe the change was to help add stability
to
the PLL Oscillator circuit.
73,
Dave, W8FGU
On 7/21/2022 11:04:58 PM, "Andrew Moore" <andrew.n...@gmail.com>
wrote:
>I just installed the temperature compensated PLL reference upgrade
kit on
>my K2 #892.
>
>From everything I can see, this rig (which I bought used) has been
brought
>up to date in almost every way.
>
>One step in the assembly instructions says that for S/N < 3000, make
sure
>I've installed the BFOMDKT upgrade, and that the kit includes a 2.7k
>resistor R19 that's soldered across pins 7 and 8 of RP2 (according to
>document "Upgrading the Elecraft K2 to Revision B").
>
>My RP2 (10K) has no resistor across any pins. However, I do have L33
>upgraded to the prewound 41 uH inductor, which I think was part of
the
>BFOMDKT.
>
>Should I be adding 2.7k across pins 7 and 8? Is there any reason this
would
>not have been done as part of the BFOMDKIT upgrade?
>
>Thanks,
>-Andrew NV1B
>..
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