A simple loop antenna has a deep null broadside to the loop for vertically polarized signals only. Its great for nulling local noise sources but completely ineffective for skywave propagated noise on
Dave, Why wouldn't you use the entire 47 foot boom? Guy attachments five feet from each end of the boom will work well with your heavy 0.25 inch wall boom. It sounds like you're planning on full size
Hi Dick, Here's their website, which includes their address and phone number http://www.advancedreceiver.com 73 Frank W3LPL -- Original message -- _______________________________________________ ____
Dick, I have dozens of the ARR 1-30 MHz preamps, and they work very well from 160 thru 10 meters. 73 Frank W3LPL -- Original message -- _______________________________________________ _______________
The latest forecast by an international panel lead by NOAA's Space Weather Prediction Center (SWPC) revises its 2007 prediction. According to the new forecast, the sun should remain generally calm fo
Rudy, In 1912, German company built an 820 foot radio tower not far from you on an ocean front island in Tuckerton, NJ. They also had a high water table problem and built most of their tower and guy
Hi Doug, Clem, W1EVT, was a Ph.D. student of the famous physics professor at Harvard University for 60 years, Ronold W.P. King. http://en.wikipedia.org/wiki/Ronold_W._P._King Clem received his Ph.D i
Guy, As far as I'm aware, there are no engineering specifications in the public domain that answer your questions about AB-105 and Rohn 55 tower. Unfortunately, the MIL-A--12868C(EL) military specifi
Oops... I'll resend the manual to Guy! 73 Frank W3LPL _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com h
Hank, Although a single very high 10 meter Yagi is by far the best choice at this point in the solar cycle, it will be inadequate when strong F-layer propagation returns. Three equally spaced large Y
Jim, Phillystran isn't intended for that application, so I doubt it would be a good choice. Perhaps someone has specific experience in this application. Perhaps your best choice would be something li
Matt, According the application procedure for Preformed Big Grips, you should use 7/16 or 3/8 heavy duty cable thimbles. http://www.preformed.com/artsfest/files/AppProc/SP2049-3.pdf 73 Frank W3LPL --
Pete, I know of several hams who have successfully used similar fiberglas strain insulators. I use the Joslyn J732 insulator clevis, you can find a photo at: http://www.macleanpower.com/file.asp?F=AF
The Rohn design assumes one 5/8" diameter line on each tower face. The wind rating is higher for ham tower installations where only a few RG-213 coax cables and small diameter control lines are faste
Hi Tom, The 15.2 sq ft at 70 MPH specified by Rohn is in addition to: - 8 square feet for three side arms (General Note 4), and - the wind load of 2 coaxial feedlines on each face (General note 5) Yo
Hi Pete, You didn't mention the type of rope currently on your tower or the type of rope you will replace it with. I've replaced three strand twisted rope dozens of times. On one end of the old rope
Tod, A sheave is the grooved wheel in a pulley or block. In antenna support applications, there is often a great deal of rope motion over a pulley during windy conditions. Rope wearout is usually cau
Hi Pete, Oops... You forgot to mention that you're changing from 5/16 inch diameter to 1/4 inch diameter rope. Forget about splicing the ropes, you should purchase new pulleys that are properly sized
Jim, I fabricate my element mounts from Grade LE phenolic sheeet. Mounting plates that I fabricated 40 years ago are still as strong as ever. http://www.mcmaster.com/#8474k172/=3sdx3a Its available i