[Elecraft] K3 Unsettling Moment on 20m

[Jeff Wandling W7BRS]

I was cookin' pretty good yesterday in the kitchen, got that 12lb bird 
roasted up just fine and I thought today, Black Friday, I would be just as 
good on 20m.  And so I thought....

I worked a couple ZS stations among a lot of North American "DX", 
thank you, that was fun.

But what sort of made me turn pale was when AC7DX politely and very 
respectfully came to my CQ and said that in essence, my SSB was spread 
across 10kc  10!?  Uh never in my wildest imagination would I thought I 
was messing up the band like that.

I turned off the amplifier and the results were nearly the same.

He went on to explain in his Pro3 that he has  bank of Rx filters and Tx 
filters.  I tried to cull from memory that the K3 has a bank of 5 Xtal 
filters and they are used both for Rx and Tx.  And, that the widest 
filter, in my case the 5-pole 2.7 stock filter was where my SSB was going 
through on Tx.

So, I need to dial into the collective knowledge here-

What was going on?  When I transmit on the K3, SSB (USB in this case) and 
my widest filter is 2.7KHz how on earth is my signal getting received 10Kc 
wide?

I put the HO-10 scope on and saw a nice trapezoidal pattern, linearity 
seems linear enough.  I was driving 80W int the SB-200 with new valves 
with a 550W-600W output on the tuner.

I've never head a comment like this before and was wondering if anyone had 
any ideas.

Thanks,

-jeff


--
Jeff Wandling DE W7BRS K3 #2105     http://w7brs.com/k3
jw at w7brs.com