Date   

Re: KK6MC/r Itinerary for June contest

James Duffey
 

OK Floyd, thanks for the note. I will be looking for you as well. We should try from my second stop on.

I will operate on the east side Saturday evening and from the west side Sunday morning. Thanks for the reminder. - Duffey

James Duffey KK6MC
Cedar Crest NM

On Jun 8, 2018, at 07:42, Floyd <k5la@juno.com> wrote:

Duffy I will be looking for you. You might stop on the East side of transmountain at the road side park.. That is where I worked Dick K5RHR Los Alamos on SSB 1296.1 I was pointing just at the edge of the mountain with a small directive systems yagi--the one with circles for the elements and 10 watts. On the West side I heard Steve W7CI on cw 1296.1.
73,
Floyd K5la dm61tv.

-----Original Message-----
From: nmvhf@groups.io <nmvhf@groups.io> On Behalf Of James Duffey
Sent: Thursday, June 7, 2018 5:58 PM
To: nmvhf@groups.io
Subject: [nmvhf] KK6MC/r Itinerary for June contest

Having recovered from working the polls, I have been able to plan my rove:

Time in grid (UTC) Grid Time leaving (UTC)
06-10-18
1800 DM64OT 1915

I am starting west of Los Lunas on Hwy 6 so that I can work 902MHGz before I get to the exclusion zone. This is pretty much LOS to ABQ, so I should be able to work everyone there.
2015 DM64NA 2100

I am stopping a second time in DM64, this time at the Socorro fairgrounds, to have a better shot at the guys in the southern part of the state as well as the El Paso guys. No 902MHz from here though.

2115 DM63NX 2230

I am stopping as soon as I get to DM63 to work the guys in the north. I have not stopped at this site before, so I am not sure how it will work out. I am still in the 902MHz exclusion zone here. :^(=

2300 DM63IA 2345

I am stopping in the last grid in DM63 at the abandoned rest stop north of Caballo in case I can’t get enough guys in the southern part of the state from my first stop in DM63.

Change of date UTC 6-10-18 still the same MDT

0000Z DM62IX 0115

This is the other end of the abandoned rest stop above. Nicely located.

0200Z DM62MN 0245Z

I will not stop here if I have worked both N and S from the above stop.

0345Z DM61RV 0430Z

This is the Transmountain Road scenic overlook on the west side. Should have good shot to the west if anyone in AZ is still up. Watch my APRS.

Quit for night, overnight in El Paso.

Sunday Morning MDT

1400Z DM61RV 1500Z

I am going to start where I left off the night before to try to work the Sunday morning UHF crowd in AZ.

1600Z DM62QK 1630Z

I will make a short stop on the Organ Mountain Pass to pick up people I may have missed the first time I was there.

1745Z DM72AW 1800Z

This is the parking lot of the NM Space Museum.

1830Z DM73AA 1945Z

This is as far up Mountain Meadow Road in the La Luz foothills as I can go before the road gets bad.

2030 DM63XH 2100

Near Oscura to give those who missed DM63 the day before an opportunity.

2130 DM73AQ 2245

Valley of Fire campground/picnic area west of Carrizozo

0115 DM75BA 0230

Rest Area 208, east of Moriarity

0245 DM74BX 0300Z

Dump south of I-40. End of contest.

I will be on APRS, so you should be able to get updates when I have coverage. Times are subject to change, if things are slow, I may leave early. There isn’t much slack to add time, but I may do that if the bands get good.

I will have bands 50MHz to 1296MHz. Cell is (505) 228-5491. Text is best, but don’t necessarily expect an answer right away. Things get busy. You can call as well, but I really prefer text.

I hope that everyone has a good contest. Listen for the weak ones. - Duffey KK6MC








James Duffey KK6MC
Cedar Crest NM







Re: KK6MC/r Itinerary for June contest

Floyd K5LA
 

Duffy I will be looking for you. You might stop on the East side of transmountain at the road side park.. That is where I worked Dick K5RHR Los Alamos on SSB 1296.1 I was pointing just at the edge of the mountain with a small directive systems yagi--the one with circles for the elements and 10 watts. On the West side I heard Steve W7CI on cw 1296.1.
73,
Floyd K5la dm61tv.

-----Original Message-----
From: nmvhf@groups.io <nmvhf@groups.io> On Behalf Of James Duffey
Sent: Thursday, June 7, 2018 5:58 PM
To: nmvhf@groups.io
Subject: [nmvhf] KK6MC/r Itinerary for June contest

Having recovered from working the polls, I have been able to plan my rove:

Time in grid (UTC) Grid Time leaving (UTC)
06-10-18
1800 DM64OT 1915

I am starting west of Los Lunas on Hwy 6 so that I can work 902MHGz before I get to the exclusion zone. This is pretty much LOS to ABQ, so I should be able to work everyone there.
2015 DM64NA 2100

I am stopping a second time in DM64, this time at the Socorro fairgrounds, to have a better shot at the guys in the southern part of the state as well as the El Paso guys. No 902MHz from here though.

2115 DM63NX 2230

I am stopping as soon as I get to DM63 to work the guys in the north. I have not stopped at this site before, so I am not sure how it will work out. I am still in the 902MHz exclusion zone here. :^(=

2300 DM63IA 2345

I am stopping in the last grid in DM63 at the abandoned rest stop north of Caballo in case I can’t get enough guys in the southern part of the state from my first stop in DM63.

Change of date UTC 6-10-18 still the same MDT

0000Z DM62IX 0115

This is the other end of the abandoned rest stop above. Nicely located.

0200Z DM62MN 0245Z

I will not stop here if I have worked both N and S from the above stop.

0345Z DM61RV 0430Z

This is the Transmountain Road scenic overlook on the west side. Should have good shot to the west if anyone in AZ is still up. Watch my APRS.

Quit for night, overnight in El Paso.

Sunday Morning MDT

1400Z DM61RV 1500Z

I am going to start where I left off the night before to try to work the Sunday morning UHF crowd in AZ.

1600Z DM62QK 1630Z

I will make a short stop on the Organ Mountain Pass to pick up people I may have missed the first time I was there.

1745Z DM72AW 1800Z

This is the parking lot of the NM Space Museum.

1830Z DM73AA 1945Z

This is as far up Mountain Meadow Road in the La Luz foothills as I can go before the road gets bad.

2030 DM63XH 2100

Near Oscura to give those who missed DM63 the day before an opportunity.

2130 DM73AQ 2245

Valley of Fire campground/picnic area west of Carrizozo

0115 DM75BA 0230

Rest Area 208, east of Moriarity

0245 DM74BX 0300Z

Dump south of I-40. End of contest.

I will be on APRS, so you should be able to get updates when I have coverage. Times are subject to change, if things are slow, I may leave early. There isn’t much slack to add time, but I may do that if the bands get good.

I will have bands 50MHz to 1296MHz. Cell is (505) 228-5491. Text is best, but don’t necessarily expect an answer right away. Things get busy. You can call as well, but I really prefer text.

I hope that everyone has a good contest. Listen for the weak ones. - Duffey KK6MC








James Duffey KK6MC
Cedar Crest NM


KK6MC/r Itinerary for June contest

James Duffey
 

Having recovered from working the polls, I have been able to plan my rove:

Time in grid (UTC) Grid Time leaving (UTC)
06-10-18
1800 DM64OT 1915

I am starting west of Los Lunas on Hwy 6 so that I can work 902MHGz before I get to the exclusion zone. This is pretty much LOS to ABQ, so I should be able to work everyone there.
2015 DM64NA 2100

I am stopping a second time in DM64, this time at the Socorro fairgrounds, to have a better shot at the guys in the southern part of the state as well as the El Paso guys. No 902MHz from here though.

2115 DM63NX 2230

I am stopping as soon as I get to DM63 to work the guys in the north. I have not stopped at this site before, so I am not sure how it will work out. I am still in the 902MHz exclusion zone here. :^(=

2300 DM63IA 2345

I am stopping in the last grid in DM63 at the abandoned rest stop north of Caballo in case I can’t get enough guys in the southern part of the state from my first stop in DM63.

Change of date UTC 6-10-18 still the same MDT

0000Z DM62IX 0115

This is the other end of the abandoned rest stop above. Nicely located.

0200Z DM62MN 0245Z

I will not stop here if I have worked both N and S from the above stop.

0345Z DM61RV 0430Z

This is the Transmountain Road scenic overlook on the west side. Should have good shot to the west if anyone in AZ is still up. Watch my APRS.

Quit for night, overnight in El Paso.

Sunday Morning MDT

1400Z DM61RV 1500Z

I am going to start where I left off the night before to try to work the Sunday morning UHF crowd in AZ.

1600Z DM62QK 1630Z

I will make a short stop on the Organ Mountain Pass to pick up people I may have missed the first time I was there.

1745Z DM72AW 1800Z

This is the parking lot of the NM Space Museum.

1830Z DM73AA 1945Z

This is as far up Mountain Meadow Road in the La Luz foothills as I can go before the road gets bad.

2030 DM63XH 2100

Near Oscura to give those who missed DM63 the day before an opportunity.

2130 DM73AQ 2245

Valley of Fire campground/picnic area west of Carrizozo

0115 DM75BA 0230

Rest Area 208, east of Moriarity

0245 DM74BX 0300Z

Dump south of I-40. End of contest.

I will be on APRS, so you should be able to get updates when I have coverage. Times are subject to change, if things are slow, I may leave early. There isn’t much slack to add time, but I may do that if the bands get good.

I will have bands 50MHz to 1296MHz. Cell is (505) 228-5491. Text is best, but don’t necessarily expect an answer right away. Things get busy. You can call as well, but I really prefer text.

I hope that everyone has a good contest. Listen for the weak ones. - Duffey KK6MC








James Duffey KK6MC
Cedar Crest NM


WA8WGZ/R Tom's schedule of DM's 2M to 2304

Steve Hutcherson WB5CTS
 

  My plans are to begin contest in Dm 42, then 32, 43, 33, 34, 44 then Dm45 at meteor crater rest stop east bound (I-40), I will be there over nite running digital modes on 6 meters,,
Sunday morning, I will leave mid morning and head west on I-40 to Dm35 near Parks, AZ, then back to Dm 44, 34 33 43 ending up in DM 42 and 32 Sunday evening and will be there until the end of the contest,,
I will have 6,meters as well as 2, 222 ,432 ,1296 and 2304. 100 watts ,5 ele on 2 and 222, 17 ele on 432, 37 elements on 1296 with 35 watts and 34 elements on 2304 with 5 watts... Over night in Dm 45 I will have 100 watts and 3 elements on 6 meters,,
I will have FT8 and MSK144 but will only use them over nite,or when stopped in a grid,, I can't do it while driving!
But the rest of the bands I will be on SSB while driving, my cell if you hear me or want a sked is 419-370-8802
Cu this weekend!!! And hope to work many of you!
Tom
WA8WZG/R

GL everyone this weekend !

FROM: Steve
             WB5CTS
             NMVHF # 42
             DM33VO

73  Steve
WB5CTS
NMVHF # 42


roundtable reminder

Bruce Draper
 

Tuesday evening @ 8 PM (0200Z) on 50.130 MHz.


W3DHJ/R ARRL JUNE VHF DM77, DM78, DM87, DM88

Jonesy W3DHJ
 

Lacking the sense that my momma gave me, I'll be rover'ing
out there in the ARRL JUNE VHF contest.

6M SSB & CW -- 100W + Halo
2M SSB & CW -- 140W + stacked Halos
432 SSB & 446 FM -- 80W and 8 elements

Saturday

SAT #1: DM88bb: 1800z~2000z.

SAT #2: DM87bw: 2000z~2200z.

SAT #3: DM77xw: 2200z~2359z.

SAT #4: DM78xa: 0000z~0200+z.

Sunday

SUN #1: DM78xa: 1200z~1530z.

SUN #2: DM77xw: 1530z~1900z.

SUN #3: DM87cx: 1900z~2230z.

SUN #4: DM88bb: 2230z-0200+z.

I will operate close in to the intersection of 38° N and 104° W
for everything -- grids DM88, DM87, DM77, & DM78. Pointing a
beam directly at those coordinates should put me well inside
the 3 dB lobes of your antenna -- unless you are very close.
(But, I know this country. NOBODY is very close...)
See also:
https://W3DHJ.net/vhfrover_plans.php

GL to all in the contest,
73,
Jonesy W3DHJ
--
<pre> Marvin L Jones | W3DHJ | W3DHJ | https://W3DHJ.net/
Pueblo, Colorado | @ | Jonesy | __ linux FreeBSD
38.238N 104.547W | jonz.net | DM78rf | 73 SK


6M JA opening NOW

Keith Morehouse
 

Big opening to JA on 6M at 2315Z.  All on FT8.
Decoding 12-15 JA's each sequence.
Heard one DU but nothing else.

-W9RM

Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Olathe, CO


Re: 6-meter roundtable

Keith Morehouse
 

Great Bruce !

It'll be nice to see/hear a few SSB signals on the band instead of 'all FT8, all the time' !

-W9RM

Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Olathe, CO

On Tue, May 29, 2018 at 7:10 PM, Bruce Draper <bruceaa5b@...> wrote:
A small group of local contesters, DXers, and some newbies has been holding a weekly roundtable that has bounced from 75 to 10 meters a few times over the years. We're moving to 6 meters, hoping to get folks to try something new and maybe it'll stick. I know it's DC to most of you guys, but drop by and join us if you have time.

Tuesday evenings, 0200Z (8 PM in NM), on 50.130 MHz.

73,
   Bruce AA5B



Re: 6-meter roundtable

n5epa.bob@...
 

Only hearing you at noise plus/minus Bruce.

73, Bob N5EPA



From: "Bruce Draper" <bruceaa5b@...>
To: nmvhf@groups.io
Sent: Tuesday, May 29, 2018 7:10:16 PM
Subject: [nmvhf] 6-meter roundtable

A small group of local contesters, DXers, and some newbies has been holding a weekly roundtable that has bounced from 75 to 10 meters a few times over the years. We're moving to 6 meters, hoping to get folks to try something new and maybe it'll stick. I know it's DC to most of you guys, but drop by and join us if you have time.

Tuesday evenings, 0200Z (8 PM in NM), on 50.130 MHz.

73,
   Bruce AA5B


6-meter roundtable

Bruce Draper
 

A small group of local contesters, DXers, and some newbies has been holding a weekly roundtable that has bounced from 75 to 10 meters a few times over the years. We're moving to 6 meters, hoping to get folks to try something new and maybe it'll stick. I know it's DC to most of you guys, but drop by and join us if you have time.

Tuesday evenings, 0200Z (8 PM in NM), on 50.130 MHz.

73,
   Bruce AA5B


6M Es prop

Keith Morehouse
 

...first EU heard for me this morning on 6, although I've been away for 3 weeks.  A couple of Italians around 1630Z on FT8 (...yeah) with signal strengths in the mid minus teens.

It's coming up to 'that time' - be alert in the AM and then again in the late afternoon for Asia.

-W9RM

Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Olathe, CO


Re: Horizontal Polarization for VHF/UHF DX

Bill
 

Nice work Dan! I put the TAPR conference on my calendar.  Thanks.

Bill W7QQ

On Sun, May 27, 2018 at 9:01 AM, <daniel.fay@...> wrote:
Bill,

Thanks for your response. I think I will test out both horizontal and vertical polarization when I get the chance. Right now, I'm trying to finish up the basic long-distance tests so that I can submit a paper to the ARRL/TAPR DCC conference (it's in ABQ September 14-16, and the paper deadline is at the end of July). I also have an STA from the FCC to do up to 50W on 70cm for this work (the modulation technique is a form of spread spectrum, and amateur spread spectrum communications are limited to 10W by the FCC). Unfortunately, the modules I'm currently using don't let me access the RSSI information on the transceiver chips, so I'm not going to be able to get precise results for horizontal vs. vertical polarization. Eventually I hope to try a different module that gives me low-level access to the transceiver chip.

Hopefully, I'll at least make some progress and put up my 15-element 70cm Yagi this weekend.

-Dan Fay KG5VBY in ABQ



Re: Horizontal Polarization for VHF/UHF DX

Daniel Fay
 

Bill,

Thanks for your response. I think I will test out both horizontal and vertical polarization when I get the chance. Right now, I'm trying to finish up the basic long-distance tests so that I can submit a paper to the ARRL/TAPR DCC conference (it's in ABQ September 14-16, and the paper deadline is at the end of July). I also have an STA from the FCC to do up to 50W on 70cm for this work (the modulation technique is a form of spread spectrum, and amateur spread spectrum communications are limited to 10W by the FCC). Unfortunately, the modules I'm currently using don't let me access the RSSI information on the transceiver chips, so I'm not going to be able to get precise results for horizontal vs. vertical polarization. Eventually I hope to try a different module that gives me low-level access to the transceiver chip.

Hopefully, I'll at least make some progress and put up my 15-element 70cm Yagi this weekend.

-Dan Fay KG5VBY in ABQ


Re: ARRL January VHF Contest results posted

n5epa.bob@...
 

Great write-up Duffey!


From: "James Duffey" <JamesDuffey@...>
To: nmvhf@groups.io
Sent: Saturday, May 26, 2018 9:23:50 PM
Subject: [nmvhf] ARRL January VHF Contest results posted




The ARRL January VHF Contest results are now available from the ARRL website:


The NM VHF Society had a good showing, finishing 11th in the Medium Club category.  We were narrowly beat out by the AZ Outlaws Contest Club, who had 3 times as many entrants! So thanks to all who contributed to the club score. 

Jim, KC7YQ, finished top in SO3B for the Rocky Mountain Division

W7QQ with W7QQ, WB2FKO, and KG5FHU as ops, took tops in Rocky Mountain Division for the Multioperator Unlimited 

The June VHF contest is in two weeks, so start getting prepped now. - Duffey KK6MC

James Duffey KK6MC
Cedar Crest NM


Re: Horizontal Polarization for VHF/UHF DX

Bill
 

Hi Dan,

I'll add one more reason why horizontal polarization is preferred: 

As a practical matter it's much easier to stack horizontally polarized yagis on a single mast. It's important to (co-aim) each antenna such that peaking an antenna bearing on one band results in a peaked signal for all other bands on the same mast. Stacking those same antennas with vertical polarization would require more unsupported mast length. This vertical mast dimension is often at a premium.  Mechanically one usually prefers to minimize unsupported mast above the tower's thrust bearing to minimize the cantilevered wind loads.

Answer number 1; It Really Doesn't Matter is one I disagree with based on my own on-air experience.  It probably matters less if one assumes each station's polarization is consistent with others, but communication effectiveness is greatly affected by cross polarization between stations...... and not in a good way. The comment about commercial stations using both vertical and horizontal polarization does not apply to weak signal operation because commercial communication is designed to maintain an effective link margin. Positive link margin may be maintained by adding transmit power, increasing receive S/N ratio or managing the path loss and distance, the latter being the variable that weak signal DXers do not manage.

Keep us posted on your conclusions as you work through this question.

73 Bill W7QQ

On Sat, May 26, 2018 at 6:12 PM, <daniel.fay@...> wrote:
Hi Everyone,

Whenever people do weak-signal work on VHF and UHF frequencies, it's always done with horizontal polarization. I'm trying to understand exactly why in the context of some long distance packet radio experiments I'm currently performing. Looking around the Internets, I find answers ranging from "you use horizontal polarization for weak signal VHF/UHF because that's what everyone else is doing" to various justifications for its superiority. Note that I'm discussing weak-signal work via e.g. troposcatter and diffraction, and not Es, meteor scatter, or EME.

Here are some of the answers that I've seen:
  1. It doesn't really matter. ISTR one paper discussing troposcatter stations in the North Atlantic that didn't see much difference between horizontal and vertical polarization. Similarly, it appears some commercial troposcatter systems communicate using both horizontal and vertical polarization as a form of diversity.
  2. Ground gain. Horizontal polarization gives you a few db (up to ~5dB) of ground gain over vertical polarization.
  3. Lower takeoff angle. I've seen some claims about this, but I'm not at all sure if this is the case.
  4. Better diffraction. Horizontal polarization may diffract better around obstacles like hills, mountains, etc. I don't know if this is analogous to how sunglasses are often vertically polarized because glare off of objects (e.g. water) tends to be horizontally polarized.
  5. Less QRM. Apparently interference (both natural as well as man-made) on some frequencies such as 2m is vertically polarized, so horizontal polarization avoids reception of it.
I was wondering if anyone who was familiar enough with the theory behind troposcatter/diffraction communications could key me in on how much better horizontal polarization is vs. vertical polarization and whether the info I've seen is correct.

Thanks,

Dan Fay KG5VBY in ABQ



Re: ARRL January VHF Contest results posted

Jonesy W3DHJ
 

On Sat, 26 May 2018, James Duffey wrote:

The ARRL January VHF Contest results are now available from the ARRL website:

< http://www.arrl.org/files/file/ContestResults/2018/2018-January-VHF-Contest-Full-Results-Ver%201_01.pdf >
Nice write-up, Duffey! I can't even imagine how much toil and trouble
it entails to take on such a job. HI!HI!


The June VHF contest is in two weeks, so start getting prepped now.
You're preachin' to a fella with a Black Belt in Procrastination.
But, I'll show up -- that's 80%, ain't it?

Jonesy
--
<pre> Marvin L Jones | W3DHJ | W3DHJ | https://W3DHJ.net/
Pueblo, Colorado | @ | Jonesy | __ linux FreeBSD
38.238N 104.547W | jonz.net | DM78rf | 73 SK


Re: ARRL January VHF Contest results posted

Bill
 

Jim,

Very nice report!  I liked that it had a very broad perspective.  Something in it for everyone.  See you at Fina tomorrow where I'll have $$ and a battery.

I've been working with AF9O, who will rove for the June contest.  He'll have a modest station on 6, 2, not sure about 222 but 432 and 1296 for sure. He'll be in a Suby Outback and will setup/breakdown at each new op site. He borrowed a PAR Moxon from me and the remaining antennas are cheap yagis.  I've done some on air testing and Eugene has a good signal on all bands when elevated and clear of vegetation (his home QTH isn't). He's working on planning now...... probably Moriarty. Pretty fun watching him light up each new band.

Bob Darlington N3XKB Los Alimos is also now on 144 and 1296.

Bill W7QQ

On Sat, May 26, 2018 at 9:23 PM, James Duffey <JamesDuffey@...> wrote:
The ARRL January VHF Contest results are now available from the ARRL website:


The NM VHF Society had a good showing, finishing 11th in the Medium Club category.  We were narrowly beat out by the AZ Outlaws Contest Club, who had 3 times as many entrants! So thanks to all who contributed to the club score. 

Jim, KC7YQ, finished top in SO3B for the Rocky Mountain Division

W7QQ with W7QQ, WB2FKO, and KG5FHU as ops, took tops in Rocky Mountain Division for the Multioperator Unlimited 

The June VHF contest is in two weeks, so start getting prepped now. - Duffey KK6MC

James Duffey KK6MC
Cedar Crest NM



ARRL January VHF Contest results posted

James Duffey
 

The ARRL January VHF Contest results are now available from the ARRL website:


The NM VHF Society had a good showing, finishing 11th in the Medium Club category.  We were narrowly beat out by the AZ Outlaws Contest Club, who had 3 times as many entrants! So thanks to all who contributed to the club score. 

Jim, KC7YQ, finished top in SO3B for the Rocky Mountain Division

W7QQ with W7QQ, WB2FKO, and KG5FHU as ops, took tops in Rocky Mountain Division for the Multioperator Unlimited 

The June VHF contest is in two weeks, so start getting prepped now. - Duffey KK6MC

James Duffey KK6MC
Cedar Crest NM


Re: Horizontal Polarization for VHF/UHF DX

Jonesy W3DHJ
 

On Sat, 26 May 2018, daniel.fay@gmail.com wrote:

... find answers ranging from "you use horizontal polarization for
weak signal VHF/UHF because that's what everyone else is doing"
Well, there you go! :-)

Jonesy
--
<pre> Marvin L Jones | W3DHJ | W3DHJ | https://W3DHJ.net/
Pueblo, Colorado | @ | Jonesy | __ linux FreeBSD
38.238N 104.547W | jonz.net | DM78rf | 73 SK


Horizontal Polarization for VHF/UHF DX

Daniel Fay
 

Hi Everyone,

Whenever people do weak-signal work on VHF and UHF frequencies, it's always done with horizontal polarization. I'm trying to understand exactly why in the context of some long distance packet radio experiments I'm currently performing. Looking around the Internets, I find answers ranging from "you use horizontal polarization for weak signal VHF/UHF because that's what everyone else is doing" to various justifications for its superiority. Note that I'm discussing weak-signal work via e.g. troposcatter and diffraction, and not Es, meteor scatter, or EME.

Here are some of the answers that I've seen:
  1. It doesn't really matter. ISTR one paper discussing troposcatter stations in the North Atlantic that didn't see much difference between horizontal and vertical polarization. Similarly, it appears some commercial troposcatter systems communicate using both horizontal and vertical polarization as a form of diversity.
  2. Ground gain. Horizontal polarization gives you a few db (up to ~5dB) of ground gain over vertical polarization.
  3. Lower takeoff angle. I've seen some claims about this, but I'm not at all sure if this is the case.
  4. Better diffraction. Horizontal polarization may diffract better around obstacles like hills, mountains, etc. I don't know if this is analogous to how sunglasses are often vertically polarized because glare off of objects (e.g. water) tends to be horizontally polarized.
  5. Less QRM. Apparently interference (both natural as well as man-made) on some frequencies such as 2m is vertically polarized, so horizontal polarization avoids reception of it.
I was wondering if anyone who was familiar enough with the theory behind troposcatter/diffraction communications could key me in on how much better horizontal polarization is vs. vertical polarization and whether the info I've seen is correct.

Thanks,

Dan Fay KG5VBY in ABQ

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