[Elecraft] K4 Question

[donovanf at starpower.net]

Hi Eric, 


We use more than a dozen K3 transceivers at the W3AO Field Day with 
as many as four operating in the same band (CW, SSB, FT8 and GOTA SSB), 
but not this year... (: 


There's absolutely no trace of interference between four K3 transceivers 
operating in the same band, despite the antennas being less than 250 feet 
apart and no external filtering to minimize in-band interference. 


73 
Frank 
W3LPL 










----- Original Message -----

From: "Eric Norris" <norrislawfirm2 at gmail.com> 
To: "elecraft at mailman qth. net" <elecraft at mailman.qth.net> 
Sent: Tuesday, June 23, 2020 9:32:04 PM 
Subject: [Elecraft] K4 Question 

My foaming at the mouth over the K4 has been tempered by it having less 
adjacent channel rejection than the K3 due to the different 
architecture--at least until the K4HD comes out. I understand this, and 
the reasons why. Thanks for your answers 

I know I have asked this question before, but I want to be more specific. 
My QRM neighbor is S9+65 db on my K3S S-meter. If he is blasting away on 
ft8 at 7074 kHz at that signal level, how would the plain K4 receiver 
perform at 7034 kHz on CW? Would there be AGC pumping, RX desense, or 
other degradation, or would I be able to carry on a CW qso unmolested like 
I can with my K3? What about an adjacent band like 3534 kHz or 10114 kHz? 
Or is the answer I have to wait for the K4HD? 

No speculation, please, I'm looking for a real-world or lab-world answer. 

Thanks and, 

73 Eric WD6DBM 
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