[Elecraft] K2 Frequency calibration

[Tom Hammond]

Hi Blake:

At 05:59 AM 1/5/04, you wrote:
>While on this topic...  I've got a previously owned K2 that didn't come 
>with the cable(s) to attach to the test points.  I assume that I can get 
>them (or at least the ends to make them) from the Mfg?

You certainly can.

Assuming your K2 is NOT one of the very first 300-400 units sold (which 
used a different type of TP jack, you'll need to order the following parts:

          Elecraft
   Quan   Part No.  Description

     1    E530067   10pf cap Axial Leads
     1    E620044   1-pin male probe tip
     1    E620021   2 pin female housing
     3    E620022   female crimp pins
     1   E980028   4" heat shrink, 3/16" dia.
     1    E760010   3' RG-174 Coax Cable

The 3rd female pin is a backup in case you botch one. And there's a LOT 
more RG-174 than needed if they actually send you 3 FEET.

IF (and ONLY if) you have an older K2 (probably pre-s/n 400), you may wish 
to consider replacing the old (MUCH less reliable) test point jacks with 
new ones. To tell of you have old or new jacks, locate TP1, TP2 or TP3 on 
the K2 mother board. If the jack has a light yellow plastic collar around 
it, you have the NEW jack and do NOT even need to consider replacing it.

If you do need new jacks:

          Elecraft
   Quan   Part No.  Description
     3    E620036   test point, female VFO, BFO, PLL REF

You WILL have to (slightly) enlarge the holes for these test points. In 
doing so, you will end up reaming out the plating which is inside each of 
the holes (which makes a top-to-bottom electrical contact on the PC board). 
It appears that all TPs can be successfully soldered from the BOTTOM of the 
board without concern that you will have damaged the plated-thru hole 
if/when you enlarge it to accept the pin of the new TP jack. The main 
copper connections to these jacks is on the bottom side of the board and 
not on the top, so the plated-thru feature is not all that necessary in 
this case.

73,

Tom Hammond    N)SS