[VHFcontesting] Attenuation from polarity mismatch (Re: C6AFP Six Meter Beacon

[nosigma at aol.com]

Mike,


Just for fun a few hams in EM9X grids had me do 6M cross pole SSB contacts with them from FM08 in January during the contest.  We were all shocked to make coms so it was time to experiment.  I am FM only with vertical beam elements and no line of sight to them. Flipped the FT991A over to SSB and gave it a try. Every one worked just fine. The FM sounded a bit better in each case. Since we had to diffract over ridges to make it happen I am sure the polarization went all over the map (same thing happens to microwaves in a compact range on edge diffraction testing in HH, VV, HV and VH).


The link below shows just how bad the terrain was between me and N8KUK.  57 miles, no line of sight, diffracting over several (5) mountain ranges and deep into a valley.  The link shows the Google earth map and the terrain profile.


http://s49.photobucket.com/user/nosigma/media/6M%20XPOL%20Diffract%2057mi%20NLOS_zpswyd6hgxp.jpg.html


I LOVE 6M FM, it gets me the evil grids!!!!  (cross pol SSB isnt too bad either).  I may try that strange SSB HH stuff some day that everyone Bragg lobes about, hi hi.


73
John
KM4KMU





-----Original Message-----
From: Mike (KA5CVH) Urich <mike at ka5cvh.com>
To: Bob K0NR - email list <list at k0nr.com>
Cc: VHF Contesting <vhfcontesting at contesting.com>
Sent: Mon, Feb 6, 2017 6:57 pm
Subject: Re: [VHFcontesting] Attenuation from polarity mismatch (Re: C6AFP Six Meter Beacon

Here's a non-scientific antidote to all this.  A local ham ~25 miles
away tried to tell me there was no way we could work each other on SSB
since his antenna was horizontal and all I had at the time was a GP-9
vertical.  I said ... try ... it was not a problem.   I even had him
turn his yagi the other direction ... he could still hear me.  not as
well of course but could hear me.  I think that he must have scratched
his head for a month over this.

he too had fallen prey to tales from the spin doctor crypt.

-- 
Mike Urich KA5CVH
http://ka5cvh.com
PIO Harris County ARES
STX: (A)PIC Dist 1 & 14

100 watts and a wire.

"If serving is below you
Leadership is beyond you"
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