[Elecraft] New firmware and new crystals for K2#740

[Ignacy (NO9E)]

After careful testing, my K2 transmits on the same frequency it 
receives. I was mislead by harmonics in sidetone generators in both 
rigs. Thank you Tom for kind suggestions!

I was able to compare K2 and TS-850 on CW and SSB. TS-850 has dual 
crystal filters in both IF. In contests especially when calling CQ and 
trying to hold to frequency, TS-850's steep skirts are an advantage. 
Under nornal QRM on 40-160m, signals from K2 seem to be more readable.  
This could be due to more linear AF path; in expanded QST tests, K2 had 
very low RX IMD. Also in CW, one can narrow K2's filter to 100 Hz 
without ringing while TS-850's  250 Hz/455 KHz filter rings badly. When 
transmitting on SSB at identical peak power, TS-850 seems to have about 
1-2S advanatge. If only K2 had a built-in RF speech processor... 
73,
Ignacy, NO9E

Tom Hammond N�SS wrote:

>> When listening to same signals on TS-850, I found that TX frequency of
>> K2 in narrow setting differs from RX frequency by about 150 Hz. (Yes,
>> RIT and XIT were turned off!). Is there any remedy for it?
>
>
> Hmmm... that's not good... if it's really there... here's a test to 
> try...
> .......