K3s in a M/M HP environment question

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I operated over the weekend as W6E as one half of a M/M HP County Expedition in CQP.

I ran the SSB side of the show and N6MI the CW. Scott has the FTDX101.

We were both operating 500w into similar spec-ed 2 element beams on 20/15/10. We were about 300-500 ft apart.

I’m looking for advice on how to minimize the CW thump thump I would hear when we were both on the same band. It didn’t raise a HI SIG warning on the K3s but it was audible enough to distract me especial if an adjacent station was bleeding into my band.

Maybe the solution is a K3s setting, maybe filters (tough) or better separation.

Paul
W6PNG/M0SNA
www.nomadic.blog <http://www.nomadic.blog/>
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[Jim Brown-10]

On 10/8/2020 4:26 PM, PAUL GACEK via Elecraft wrote:
> I operated over the weekend as W6E as one half of a M/M HP County Expedition in CQP.
>
> I ran the SSB side of the show and N6MI the CW. Scott has the FTDX101.
>
> We were both operating 500w into similar spec-ed 2 element beams on 20/15/10. We were about 300-500 ft apart.
>
> I’m looking for advice on how to minimize the CW thump thump I would hear when we were both on the same band. It didn’t raise a HI SIG warning on the K3s but it was audible enough to distract me especial if an adjacent station was bleeding into my band.

#1) Buy Scott a better radio. Yaesu radios are notorious for being a
very bad neighbor. They're dirty, there's nothing another radio can do
when the other radio is spewing trash on your frequency.

#2) Study my talk on multi-station interference for many things you can
do with station building, antenna choice, feedline choice, antenna
layout,and the use of serious ferrite chokes at every antenna feedpoint.

Also see my detailed analysis of ARRL Lab tests of a selected number of
rigs. The raw data for my report came straight from ARRL Labs in
electronic form. Also see ARRL Lab plots of keying bandwidth and phase
noise for Scott's radio.

k9yc.com/publish.htm

73, Jim K9YC
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[Jim Brown-10]

On 10/9/2020 10:39 AM, Walter Underwood wrote:
> Every time I see one of those plots from the ARRL Lab, I wonder “what is a good number?” I really wish they would add some additional lines to the graph. One suggestion:
>
> * FCC regulated limits (where they exist)
> * 90th percentile (best 10%) of tests in the previous five years
> * Best test in the previous five years

Some of that information is in my summary of ARRL Lab tests.

FCC limits are not expressed well for those who deal only with numbers.
What SHOULD be the dominant paragraph says that the bandwidth of a
signal shall be the minimum required for the means of transmission. In
practical terms, that means carefully shaped CW keying, minimum phase
noise, minimum IMD. It's essentially a "state of the art" spec. But
because there are no numbers attached, the paragraph is widely ignored.

73, Jim K9YC


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