Wow, my XA sure doesn't work well on 17M. Receive signal strength is very weak, and the swr is extremely high. On the other hand, my 40-2CD is a wonderful 17M antenna, with a big front/back to side r
The Radio Shack Model 43-591 Telephone is on sale through March 28 for $16.99. This phone is highly resistant to rfi. At that price, they are cheaper than filters, and you can hand 'em out to the nei
The Rohn Tower manual shows a 68' Rohn 25 tower with four-way guying, having the guys anchors only 25' out from the base. This puts all of the guy anchors within a 35' x 35' box. If a KT34XA, turn ra
I'll bet the negative resistance was caused by the water inside acting as an electrolyte and creating a small battery that opposed the battery voltage in your meter. I have a 40-2cd and started out w
On Sun, 08 Feb 1998 09:10:04 -0600 Bob Perring <perring@texas.net> writes: This is a new one on me. I just connect the shield to the tower, and that's it. I modeled my half sloper for 80, and some of
If the KT-34XA is that bad on 20 and 15 phone, I must be one HELL of an operator! No way, Steve. Dave Hachadorian, K6LL Yuma, AZ K6LL@juno.com ________________________________________________________
Statistics on signal arrival angles from various parts of the USA to various parts of the world, including Europe, are contained in the the program YTAD, which is available somewhere on the ARRL Web
The formula that is usually used is Q = .04 V*V so: 50 mph = 10 psf 70 mph = 20 psf 80 mph = 25.6 psf It is correct to say that that at 80 mph the horizontal wind force on the overall tower structure
Make that Q = .004 V*V It's nice to know that there are some people who read this stuff closely! Sorry for the slip. Dave Hachadorian, K6LL Yuma, AZ K6LL@juno.com -- FAQ on WWW: http://www.contesting
On Mon, 15 Dec 1997 19:45:05 +0000 Andy Cook G4PIQ <g4piq@blacksheep.org> writes: The computer program YTAD contains such statistical files, and is available somewhere on the arrl.org web page. Dave
On Mon, 15 Dec 1997 19:45:05 +0000 Andy Cook G4PIQ <g4piq@blacksheep.org> writes: The computer program YTAD contains such statistical files, and is available somewhere on the arrl.org web page. Dave
Actually, minimum swr occurs at resonance. For example, if the antenna is 25 ohms at resonance, the swr = 2. If the frequency is changed such that the impedance is 25+j43, the swr = 3.7, even though
On Wed, 29 Oct 1997 23:38:06 -0800 Gerald Caouette <ve6nap@oanet.com> writes: You don't need to go to spread spectrum to beat cw. Figure 7 on page 39 of July, 1996 QST shows PACTOR II cruising at abo
Electrolytics have a low breakdown voltage in the reverse direction. There is a way to use two electrolytics back-to-back, with shunting diodes, but you would be better off buying a capacitor designe
My Rohn 25 48' foldover has been up for 20 years. To remove the top guys you just unscrew the turnbuckles until the top guys are loose and unscrew a bolt, or in my case with old-style Philly terminat
We have all had experiences like these. They are very memorable data points that tend to put a positive bias on the user's opinion of the antenna he is currently using. I thought the world of my clos
Here is a little worksheet that I made for RF Safety Evaluation. It may look strange on your email reader because of the longish line length, but save it to a file, and then you can edit it. It conta
There was an error in the URL for the University of Texas. It should be utexas, rather than texas. Here is the whole thing again with the correction. Dave Hachadorian, K6LL K6LL@juno.com Yuma, AZ A.
Here is an updated version of my RF Safety Worksheet. There were no errors in Rev. B (as far as I know), just some enhancements in this version. I hope you find it useful. Let me know if you find any
On Tue, 30 Sep 1997 23:35:51 -0500 Steve Narducci <nw9g@netusa1.net> writes: I wouldn't put a 40-2cd anywhere near an 18 mhz antenna, since the 40-2cd elements are third-harmonic resonant at 18 Mhz,