[Elecraft] K2 S/N 1999

[Don Wilhelm]

Ed,

Yes, all the upgrades (and the optional ones too) is my recommendation - 
why skimp when you have it all torn down.  Although not entirely 
necessary for the KPA100 installation, the added heat of the KPA100 
makes the BFO upgrade, the PLL upgrade and the Thermistor (PLL 
temperature compensation) mods are highly recommended.  With an older 
K2, you will have to modify the Control Board to change the sidetone 
source and free U6 pin 25 for use with the computer interface, so you 
have one cut right there that is required.

I recall our discussion at Dayton, and I also recommended you change the 
IF crystals to the newer spec crystals too - that will improve your 
filters, and if you want, change the caps on the KSB2 to widen that 
filter out to 2.4 kHz or even 2.6 kHz.

I have no comment on the other amp questions.

73,
Don W3FPR

Ed Lambert wrote:
> I have been inactive for about 5 years. My K2 is cw only with KNB2, KDSP2,
> KAF2 (now uninstalled), KAT2, and KIO2.
>
>  
>
> I want to get back on the air and want to bring my transceiver up to current
> specification for possible modification to K2/100. Discussion with Elecraft
> staff at Dayton seemed to indicate that I really didn't need to do much to
> my radio to install the KPA100 option. However, the KPA100 manual seems to
> want a complete A to B upgrade in addition to K2KEYMDKT, E850138 and
> BFOMDKT.
>
>  
>
> I have been stubbornly resistant to some of these upgrades because they
> result in great insult to the inherent beauty of my radio (it has no trace
> cuts nor does it have slapdash parts soldered hither and yon. I think I have
> gotten past this squeamishness, however, and am ready to move forward.
>
>