Isn't the a half wave high tower the general rule of thumb for a decent dx angle? After 60ft (1/2 wave on 20m) you need more guys with Rohn 25 and the work difficulty starts increasing rapidly. Sent
Pretty good information here: http://radio.n0gw.net/radio12.pdf Mike, k5wmg _______________________________________________ _______________________________________________ TowerTalk mailing list Towe
No, 1/2 wave is where a horizontally polarized antenna shows its first null directly overhead. 60 ft is 0.86 wave on 20 meters (14 MHz) - one wavelength is 70 feet. If I had to choose a single tower
Optimum height for a tower is a classic case of "it all depends". What are your interests?, What's the geography like at your QTH?, Are there obstructions?, Are there zoning restrictions? , What's th
Getting things together here to get the antenna/rotor, switchbox up on the tower and plan for the half square for the lower bands. I've had this in a file and wanted to share it. Good information abo
Author: Andreas Hofmann <Andreas.Hofmann@microsoft.com>
Date: Thu, 1 Dec 2011 18:47:03 +0000
I have received an overwhelming response to my questions. I should have mentioned a few more points/requirements: - single multiband beam 40 - 10. No stacks. I am running verticals and wires hanging
I think we sometimes concentrate too much on looking at antenna heights that will maximise gain at certain take-off angles, and forget about the nulls. Those deep elevation nulls can be "killers" if
You have to get HFTA. It's just that simple. You'll get a good picture of what your antennas need and it will help you avoid overkill, which helps avoid added costs. Too high an effective height can
In general, I agree with those comments and the unwanted nulls can be very large. I did exactly as G3TXQ recommends when I installed my tower and chose antenna heights for each band, but I'd like to
I think ALL of that is great advice, at least partly because I pretty much did exactly that when I installed my system three years ago ;) I have an Optibeam OB16-3 tribander three feet above the top
I would agree that a 70 ft tower is a good option for most band if you do not want to go higher. I have the AN Wireless 70ft tower with a SteppIR at 71 ft and the Cushcraft XM240 about 12 to 14 ft ab
Andreas, I started my planning at my current location with that same requirement: no guy wires. I had previously owned a US Towers 89' crankup, which worked well for many years. But I was changing an
Author: Andreas Hofmann <Andreas.Hofmann@microsoft.com>
Date: Thu, 15 Dec 2011 07:13:02 +0000
Hi I want to thank everyone on this alias to suggest running HFTA. I spent and couple of hours tonight and now realized that this was a very valuable exercise. Since I promised to report back some fi
I looked over on Amazon.com for the latest ARRL Antenna Book, so I can get a copy of HFTA to run the numbers for my QTH. They usually have much better prices than the ARRL site. I recently ordered th
I notice there are several versions of the book. Is the program available in all versions? For example, the "ARRL Antenna Book 22nd Ed Softcover [Paperback]" doesn't say if you get a data CD with the
I know for certain that the CD is included with soft cover editions of the 20th and 21st editions, and I suspect it is in the 22nd as well. Check the ARRL website to be sure Just make sure that you a
wow, I will sell mine with a 50% discount for $500.00 hihi Bob K6UJ _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@co
If anyone is interested I have this latest ARRL antenna book, 22nd edition in the hardback version. With CD. Brand new. Retail price is $59.95 It has not even been opened yet. I will sell for $40.00
Yes, the software is included with the latest edition. 73 Roger (K8RI) _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk
That is not the latest edition. Note the printing date of 2007. They must think it's a collectors edition<:-)) I have a number of them, but not so sure I have the 2007 edition. Now if any one has a m