[Elecraft] K4 Question

[Wayne Burdick]

Hi Eric,

S9+65 dB is about -8 dBm. Off the top of my head, this is far, far below what a basic K4 or K4D can handle, artifact-free, in-band, without the need for attenuation or additional filtering. When I get back to the lab I'm going to set up exactly this condition and get back to you.

Of course the out-of-band rejection is even higher.

A number of K4s will be used extensively during FD this year, including mine. I'll be taking advantage of the K4's low current drain (for its class) by running mine from a KX2 11 volt battery pack (3x 18650 cells). For at least an hour or so :)

73,
Wayne
N6KR


> 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