One thing that's holding me up is doing the research to figure out which mods
I've done and which I should do. Mine is 1818 and I fervently kept up with all
the mods, updates, and tweaks for 3 or 4 years after I built it. You mention
replacing the IF xtals. I know I did that at some point because I have a little
paper envelope with the set I pulled out, and I remember doing the improved
grounding mod of soldering the grounding wires to the base of the xtal cans.
IIRC, at the time some were adding additional SMT bypass caps at the xtals but
IDK where that went. There were many temp drift tweaks and mods going on too
and I have many pages in my notebook experimenting with those, especially with
the heat introduced by the KPA100. I have lot's of cryptic notes like:
"Removed RF C180 to flatten 2nd IF filter. Added 10pF NPO in parallel with C72
to reduce VCO voltages. Set L30 for 6V. Removed 1 PLL xtal X1 per Wayne." and
it goes on.
Perhaps the main obstacle is it's still working FB for me. There's always that
sage piece of wisdom lurking in the back of my mind, "Don't fix it if it ain't
broke." HI HI
Lou W7HV
On Sunday, May 9, 2021, 6:40:05 PM MDT, Don Wilhelm <[email protected]> wrote:
Greert Jan de Groot,
If you have an earlier K2, I suggest that you do the other upgrades.
If your K2 is below SN 3000, then the K2ATOB mods are applicable -
download the K2ATOB instructions for a list of all the mods are required.
If your SN is below 2560, I recommend replacing the IF crystals for a
better IF filter response.
Those steps will bring it up to date except for the K2 Keying Waveshape
mod which is currently not available from Elecraft as a kit. I can give
you instructions on how to install it on your K2 if necessary. K2s
above SN 4660 have that mod already installed.
73,
Don W3FPR
On 5/9/2021 5:36 PM, Geert Jan de Groot wrote:
> On 09/05/2021 20:54, [email protected] wrote:
>> Don, W3FPR used to do much of this work on K2 transceivers, but he has
>> retired from that role. Dave, W8FGU has assumed Don's role. Alan, W3DVX
>> also provides such services. Both have posted periodically to this
>> forum.
>> There may be others who are experienced K2 upgraders, but these are the
>> folks that come to mind.
>
> I built my KPA100 15 years ago or so and only recently I investigated
> updates. The KPA module has seen a number of design updates over the
> years and it makes sense to investigate. I've updated mine (thanks
> QRP-shop for getting the mod kits in Europe, through Corona times!)
> and at the end of a long evening I have a bag of swapped-out parts and
> a PA that worked quite a bit better, feels like a new unit.
>
> I have not used one of the upgraders (being in Europe, postage and
> customs would probably have me mortgage the house, frankly) but I do
> recommend updating. It is too bad you don't have the setup to do it
> yourself because on K2, these mods really are simple and can be done
> on the kitchen table.
>
> Geert Jan
>
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