[Elecraft] Elecraft K2 Temperature-Compensated PLL Reference Upgrade

Fri Apr 25 22:00:16 2003

Eric:
  I know when John first did some of the drift tests, there were 
substantial variations in how badly different K2s were affected by the 
problem.  How does "one size fits all" work for this mod?

best wishes,

dave belsley, w1euy

--On Friday, April 25, 2003 3:51 PM -0700 Eric Swartz WA6HHQ - Elecraft 
<[email protected]> wrote:

> We've just completed field testing of an easy-to-install upgrade to the
> K2's PLL synthesizer stage. The upgrade uses a thermistor and a few other
> components to temperature-compensate the varactor-tuned crystal reference
> oscillator. The compensation circuit reduces the reference oscillator's
> temperature coefficient by as much as a factor of 10. This will be of
> particular interest to those who use the K2 with the KPA100 option, or
> who frequently operate outdoors or mobile.
>
> All of the components are mounted on a small circuit board which replaces
> one of the existing resistor networks. This results in a clean, no-wires
> installation. The changes do not increase current drain.
>
> The PLL upgrade will be included free of charge with all new K2 kits
> starting today (s/n 3446 and up). Existing K2 owners can purchase the
> upgrade kit for only $19 (order number E850138). The upgrade kits are now
> in stock.
>
> You can get more information at:
> http://www.elecraft.com/order_form_parts.htm#K2%20Parts
>
>
> We'd like to thank John Grebenkemper, KI6WX, who designed the
> temperature-compensation circuit, as well as all of those who
> field-tested the upgrade kit.
>
> 73,
> Wayne, N6KR
> Eric, WA6HHQ
>
>
>
> http://www.elecraft.com/order_form_parts.htm#K2%20Parts
>
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----------------------------------
David A. Belsley
Professor of Economics