[Elecraft] Question RE Builder Alert #18

[Wayne Burdick]

Ron,

The BFO/PLL mod kit did not originally contain the 2.7 k resistor, which was an
oversight. It is now supplied. If you got an earlier kit that didn't include it,
use anything from 1.8 to 3.3 k. Yes, this increases range over the 10 k used in
the Rev A design.

After changing this resistor you must re-run CAL PLL (on 40 meters only,
assuming you have revision 2.0 or higher firmware).

73,
Wayne
N6KR


Ron D'Eau Claire wrote:
> 
> Trying to catch up on the applicable Mods/Fixes/etc in my K2.
> 
> Builder Alert #18 Says that resistor R19 was recently added to the
> design to extend the range of the PLL reference oscillator and to
> provide best tuning linearity.
> 
> The alert says the it is applicable to "Older K2s that have been updated
> with the BFO/PLL mod kit, if a value of 220 ohms was used for R19". The
> alert specifies changing the value of R19 from 220 ohms to any value
> between 1.8 and 3.3 k.
> 
> I recently installed the BFO/PLL mod kit in my K2. There was NO R19
> included nor specified in this mod kit! I even opened up my K2 to check
> and found none <G>. The instructions with my mod kit are dated November
> 6, 2002.
> 
>  The wording of the alert implies that all K2's should now be equipped
> with an "R19" on the r-f board.
> 
> Is this wrong?
> 
> Was it determined that no change to the 10k value originally used in the
> circuit is needed for best tuning linearity with the new PLL crystal?