[Elecraft] How do I know if my K2 has BFOMDKT installed?

[Dave Van Wallaghen]

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.nv1b at 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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