What Don says is right on! I have K2/100 #380 and
have done all the mods -- and they were all worth
doing :-)
73, Phil W7OX
On 7/3/16 2:19 PM, Don Wilhelm wrote:
Frank,
That mod is not for all K2s - the K2 design was
changed to produce a more sine-wave sidetone.
Look closely at the information below.
If your K2 serial number is lower than 3000 -
*and* you have not installed the K2ATOB mod kit,
then that can be a worthwhile change.
Be aware that this published mod is quite old,
and will cause problems if you attempt to apply
it to a K2 above SN3000 or one which has been
upgraded with the A to B mods.
The sidetone changes made with the A to B kit
and K2s above SN 3000 are not exactly the same
as this mod, but do essentially the same thing,
but with slightly different component values.
If your K2 is below SN3000 and has not yet had
the A to B kit installed as well as the other
mod kits indicated on the A to B Instruction
sheets, then I recommend you do those upgrades
instead of just adding the sidetone mod. The
temperature stability and electrical stability
of your older K2 will be improved substantially.
If the serial number is below 2560, you will
also benefit by changing the IF crystals on both
the base K2 and the KSB2 option for a smoother
filter response. Look at the markings on the
crystals - the new crystals have a "-S" suffix
marked on them. If it is anything else, you
have the older crystals. The new crystals were
shipped with kits beginning at SN 2560.
73,
Don W3FPR
On 7/3/2016 4:43 PM, [email protected] wrote:
So I have had some quality time with my K2 this
weekend.
I am thinking of doing this modification to my
sidetone, has anyone tried it?
http://qrpzone.com/elecraft-k2-side-tone-mod/
Seems pretty easy to do and I have always
thought it was “my ears”.
Comments?
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