[Elecraft] K3 vs. Icom IC-7600

[Bill W4ZV]

Eric Swartz - WA6HHQ, Elecraft wrote:
> 
> Unlikely since thy use a high first IF with their narrowest roofing 
> filter at 3 kHz. signals inside that filter will overload the first 
> mixer and subsequent stages, well before any later crystal or DSP
> 

Icom may be the master of misleading advertising.  The "3 kHz" BW filter
Eric refers to above has actually been measured at 5.2 kHz by Sherwood
(assuming it's the same one used in the IC-7800).  The following is a direct
quote from Sherwood regarding the 7800's "3 kHz" and "6 kHz" (actually
measured 11 kHz) filters below:

"The 3 kHz (5.2 kHz in my radio) roofing filter had a couple dB more IMD
than the 6 kHz (11 kHz) filter."

Source:  http://groups.yahoo.com/group/ic7800/message/5417

I do not believe any Icom advertising...which is what Universal Radio's
comments are based on.  If you wait for ARRL, RSGB (already published?) or
Sherwood tests of the 7600, my guess is its close-spaced IMD performance
will be about 20-25 dB worse than the K3.  Remember the advertising claims
for the Ultimate Transceiver (the IC-7800)?  Look where it falls in
close-spaced IMD performance on Sherwood's site (80 dB is actually identical
to a little K2...and $10,000 less expensive!)

Regarding the anonymous "RFEXPERT"...this self-proclaimed "expert" reaches
different conclusions about the K3 compared to genuine RF experts like W8JI
and ON4UN (both now K3 users).  Talk is cheap...especially when we don't
know who's doing the talking.  Independent test results speak louder to me
than any Icom advertising.  

73,  Bill
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