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Antenna Polarization for FM contesting

May 3rd 2014, 23:01


Joined: Mar 20th 2014, 18:00
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Total Posts: 0
For best results in the FM only single operator contest should I stick with vertical polarization or go to horizontal polarization ?

May 5th 2014, 20:42


Joined: Apr 4th 1998, 00:00
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You should stick with vertical polarization.

I've done FM contesting using 222 and 446 Yagis mounted on a horizontal crossboom.
I've designed a rear mount 2M FM Yagi.

Jun 2012 - QST (Pg. 39)
An Easy to Build Rear Mount 2 Meter Yagi
(Feature) Author: Lau, Zack, W1VT

Zack W1VT
ARRL Senior Lab Engineer
Nov 2nd 2014, 22:08


Joined: Mar 1st 2011, 09:28
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Actually, I would have to disagree.
Most contests are held away from the FM crowd on Single Side Band.
You will be hard pressed to find anyone to work during a contest, since most contest stations uses horizontally polarized - beam antenna's, and they use Single Side Band frequencies.
Their antenna's are not designed to operate in the FM portion of the bands. If you already have a 13 element - 2 meter FM beam antenna, and if it is already vertically polarized, then it is what it is, and it isn't going to make any difference if you are going to make contacts more then 80 miles away - since the polarization changes when the signal travels over the horizon.
The key is to purchase a good 2 meter / 70 CM - Single Side band transceiver, even if it is just a mobile - as long as it does Single Side Band.
In the morning, it is possible to work people as far north as Detroit Mich from Western Pennsylvania on 2 meters with just a single 13 element beam on a 60' tower, at an elevation of more than 1300' and some decent coax - Belden 9913 or LMR 400 and some good UHF (N) - not PL connectors. PL connectors are no good for frequencies above 250 MHz. They are just too lossy, as is cheap coax. Your best bet is to get a 6 meter beam antenna and work 6 meters SSB...
Nov 4th 2014, 13:52


Joined: Apr 4th 1998, 00:00
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If FM is all you have, FM polarization is fine.

I appreciate FM operators during VHF QSO parties. FM contacts added to my overall score, each time I have participated. During lulls in the event, I always check out the 2 meter FM simplex frequencies (excluding 146.520 MHz). Those 20 or so extra QSOs can add to a serious contester's score.

It would be nice to see some new participants during contests. Maybe we should have an FM only catagory?
Nov 6th 2014, 19:39


Super Moderator

Joined: Apr 4th 1998, 00:00
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In one of the VHF contests, I did a bit of roving and I had a lot of fun getting on FM simplex between roving sites and working the hams on simplex. Many had modest antennas and were delighted to have some fresh meat. I think we are seeing more FM activity in contests than in years past and I will add some fun to the contest. Ed, W1RFI

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