Zero degrees is north, which can be found by locating Polaris in the (clear) night sky. Polaris is the star at the end of the handle of the little dipper. The front edge of the big dipper points towa
Gary, Compare the difference in gain between the yagi and a dipole. A dipole has a gain of 2.1 dBi, so compared to a yagi with a gain of 8.1 dBi the difference would be 6 dB. 6 dB is a power ratio of
There are also options at <http://lists.contesting.com/mailman/ listinfo/towertalk> to indicate whether you want your message to be sent as plain text or html. You must log in with your password to c
That's why he is standing on the boom to make adjustments (manual SteppIR). Bob, N7XY _______________________________________________ _______________________________________________ TowerTalk mailing
I suspect that when analog TV receivers are no longer being made, some sort of cheap DTV sources will become available for monitoring and other closed-circuit applications in response to what would s
Hurry and order, as they will only be available tomorrow! Bob, N7XY _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@co
I am a physicist not a P.E., but this sounds incorrect to me. I believe you need to end up with zero net horizontal force at the attachment point on the tower of each set of guys (i.e., guy tension X
No. Use coax with a braided shield and stranded center conductor instead. It will flex fine for a while, but eventually the corrugated copper outer conductor and/or the solid center conductor will fa
Certainly, and in a few months it will be covered with leaves, dirt and other miscellaneous debris. Not a pretty sight, but possibly a neat idea for a stealth antenna. Noalox is basically grease with
It isn't a common size, but is still listed by by the manufacturer Andrew Corp (type LDF4.5-50A). You might try them at 1-800-255-1479. 73 - Bob, N7XY _______________________________________________
Plenum-rated cables have a fire-retardant outer jacket for use in plenums (spaces in buildings used for air circulation). 73 - Bob, N7XY _______________________________________________ ______________
10base-T refers to the type of ethernet connection which used Cat5, etc., cables. As opposed to 10base-2 which used 50-ohm coax. I don't see that nomenclature used much anymore. _____________________
I've never had a motorized crankup, but the way to handle that is with a limit switch which cuts off the power when the tower reaches a specified position. Likewise, one can be used to do the same in
There is a big difference between the price of copper on the commodity exchange and the price of wire. Maybe some of the mines and smelters which shut down in the 90s will reopen. ___________________
Something like this could possibly be adapted to a mag mount: <http://www.diamondantenna.net/k9000tm.html> Bob, N7XY _______________________________________________ __________________________________
A quarter-wave vertical with radials is definitely unbalanced. A half-wave, center fed vertical is balanced if it is sufficiently elevated (with the feed perpendicular). Most are probably "semibalanc
The cable you are referring to is RG-6. I have never seen UHF connectors for this--the standard connector is type F, and is available in both crimp and compression models. Adapters from F to UHF are
I also have a AV-640 (my only HF antenna currently) and my experience with it over the past 5 years is quite different. I have had good results from 40-10 (don't do 6) and a contact with 5A7A this mo
Yes, it does include the R8, but it wasn't elevated much and there was a ground screen. Based on the results quoted, I was seriously looking at the R8, but the AV-640 is nearly identical except for n