K3NG:
>can I expect comparable or better CW performance to
what I have with my Kenwood 850 with a 500 Hz crystal filter?
Probably better but you need IMD performance
at 2 kHz spacings using the stock 2.7 kHz filter to
answer for sure. Sherwood Engineering measured the
TS-850S with dual Inrad 400 Hz filters (in the 8.8 MHz
and 455 kHz IFs). At 2 kHz, IMD was 77 dB. Considering
that this is with a 15 kHz roofing filter in the 1st IF
of 73 MHz, I suspect the K3's 2.7 kHz filter in its 1st
IF of 8.125 MHz will be substantially better.
Using the optional 400 Hz filter in K3, we have
already seen the following hints from Elecraft:
N6KR: "But just to give you a hint: a couple of days ago Eric
measured a blocking dynamic range of 143 dB, and it remained 143 dB at
20 kHz, 5 kHz, and 2 kHz. To put this into perspective, the K2,
IC-7800, Orion II, and FTDX9000all have a blocking dynamic range of
-133 to -135."
WA6HHQ: "As an example, we're seeing third order IMD D.R. numbers on
20M at 20 kHz spacings in excess of 104 dB and 97 dB at 5 kHz with the
400 Hz filter ahead of the DSP." (de W4ZV - Orion II is 95 dB at 5 kHz)
Plus, when N6TR says he is replacing
both of his TS-850s with K3s in his SO2R setup,
you can probably take that to the bank!
73, Bill W4ZV
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