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HF Beam Antenna Polarization Aug 19th, 02:05 6 213 on 21/8/14

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WB7DIE WB7DIE 3 weeks, 1 day ago
WD3D ... Gerry,

I resent your issue about older call letters like my own as I've been assigned the WA9WVX call letters since October, 1968 and have never changed them for any reason even if I were to up grade to an Extra! I have used the term OSL during a QSO to confirm whatever the operator on the other each needs but now I guess the Amateur Radio Community must bow down to the Old Timer Extras because they are unwilling to change or be flexible with the newer operators ... even with older individuals like myself.

I'll bet any amount of money that you didn't start out in this hobby as an Extra ... everybody starts some where and it's NOT at the top of the chain. Yes, I agree that the ham community has lost some of it's dignity when the ARRL & FCC removed the CW requirement and made the written exams so easy that the newer people only need to send in 3 Box Tops from their favorite Cereal and some money to get a ham license BUT where was the hobby going anyway with Cellular Phones and Computers that the General Public use on a daily basis?

The Old Timers seem to be unwilling to step up to the Plate and become Elmers which is SAD in my opinion. We're the guys that are suppose to help guide the new ops but we complain about the newbies having poor operating skills and not knowing anything.

Any where I can help .. I do it ... even for the so-called Extras as I'm retired from 2 - Way Radio Communications in the Land Mobile Radio Industry which was my career spanning from HF all the way up to Microwaves and I've worn many caps during my career. I'm a bit rusty on CW but there are many different modes that I've been involved with including encryption so if you label me as a LID, you better look in the mirror at yourself too!

best choice for 2 meter Base antenna in wwoded area AC8RW 4 weeks, 2 days ago
It's a bit difficult to determine which frequency bands you're referencing too for a vertical antenna to be used on. I can provide general engineering references for RF Path Losses, i.e. HF would be -1 dB Loss, VHF 50 MHz would be -2 dB Loss, VHF 144 MHz would be -5 dB Loss and UHF 430 to 450 MHz would be -10 dB Loss. As to where you plan to mount the vertical on your home is a completely different issue in itself as to the structure's height as a one story home is approximately 16 feet tall versus a two story home is approximately 22 to 25 feet tall. On HF the height wouldn't mean that much but you would need at least 2 radials per HF band on the vertical for good performance. On VHF 50 MHz height starts to matter so install it as high as possible, on VHF 144 MHz height matters quite a bit so install it as high as possible and on UHF 430 to 450 MHz, height is the name of the game and use 9913 coaxial feedline for Minimum RF cable Losses so install it as high as possible and even though you will be located in a eastcoast mountainous area, I'd be guessing at best where the home would be placed, i.e. on a downslope below the top or right up on the top. Again, HF no problem but on VHF 50 MHz & 144 MHz and on UHF 430 to 450 MHz, you would develop shadowed areas as Losses for the RF signals depending on your location.

Above 148 MHz,below 144 MHz Nater27 on 22/10/14
Generally the 136 to 143.900 MHz has been assigned to the U.S. Military for their communications, 143.9000 to 144.000 MHz is used for the Civil Air Patrol and 148.000 to 148.100 MHz is used for the Civil Air Patrol for their Repeaters & Simplex operations, above 148.100 up to 175 MHz is set aside as Commercial Business Band that Public Safety, Taxi Cabs, Hospital Radio Paging, the U.S. National Park Service, NOAA Weather, VHF marine communications, Several U.S. Federal Government Agencies, small Businesses i.e. Gas Stations / Towing Services and most of these radio channels are going to the newer Digital modes for better RF coverage and narrow band operation.

One Antenna or Two for HF/VHF/UHF pmc181 on 27/9/14
Hello Paul,

I see that you have chosen two different Multimode Multiband transceivers. It would be a pity not to be able to use all of the modes or 10 m, 6 m, 2 m & 70 cm bands, traditionally Weak Signals CW / SSB use horizontal polarization which minimizes the man made noise levels whereas Analog FM uses vertical polarization, pretty much immune to man made noise. You could erect a small 10 m beam on a tripod with a 5/8 Wave Vertical on the same mast pipe. The erect another tripod to hold a 4 element 6 m, 11 element 2 m & a 14 element 70 cm beams horizontally stacked 3' apart with a Tri-Band 6 m, 2m & 70 cm Vertical on the top of the mast pipe and have the better of all four frequency bands to use.

BTW, Good Luck on Passing your License Test.

40 foot tilt tower winch system brakemanbobsmith on 23/9/14
Hi Bob,
I believe I know what you have as the Tilt Over Section is in the middle of the 40' being 20' above the ground and there should be a triangular brace that mounts to the top 3 rd section and over laps the 2 nd section above the ground. Those tower were marketed in the mid 1970s and probably production ran 10 years. The bottom of the triangular tower section that over lapped to of the main 10' sections normally had Galvanized steel cable attached to the over lapped bottom of the triangular section (this section was a little smaller to the standard 25G or 45G sections so it would lay flat against it) and on the very bottom 10' section Rohn mounted the hand crank assembly at 4' so one individual could raise or lower the Tilt Over Tower, Rohn used an unusual way of guying the tower, where the hinge is they set up four (4) individual guy lines but at the top they used three (3) individual guy lines. These tower could be set up as 40', 60' & 70'. I believe the 60' & 70' were hinged at 30' and naturally the over lapping triangular arm assembly straddled the 30' & 40' sections. Of course the length of the Galvanized cable had to be longer for the taller towers to Tilt Over. If this doesn't sound like what you have, perhaps it isn't a Rohn tower. The Crank assembly was similar to what people use to pull the boats up om to trailers so you might want to stop by a boating store to see if they can sell you that type of a Cranking assembly.

There a tower company known as Heights that uses a different method to raise and lower fixed length towers. They used a case harden huge steel screw something like 3 or 4' long built on to a triangular steel assembly. I hope this isn't what you have but they are still available:!foldoverkits/cqqv


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