Bill, We have had good luck at W6UE turning a KLM KT34XA stacked over a KLM 40M4 both with heavy duty "ICE" booms (1/4 wall x 3" O.D.) using the M-squared OR-2800. This stack of antennas weighs 300lb
For many folks these days, a remote base is the only viable compromise between reasonable proximity to the workplace and affordable land big enough to support a reasonably competitive ANTENNA TOWER
I believe for the same tensile load, phylistran stretches more than the equivalent (same load rating) EHS steel guy. Kurt K7NV did some really interesting analysis on this: http://k7nv.com/notebook/t
Hi Jim, I don't have any experience with kevlar or fiberglass kuys other than admiring it on other peoples towers. If you look at Kurt's website, however, it looks like for the same 3000 lb tensile l
I don't know if Kurt's analysis took this into account, Tom. It would interesting to see where the break even point occurs between the effect of the catenary in the insulated steel span and effect of
Well said, Martin. That is the beauty of transmission line theory. The time domain "reflection" model of what is going on is consistent with the steady state "circuit" model of what is going on. The
I would like to add that it is fairly easy to export terrain profiles from Radio Mobile and the import them into HFTA. I tried using MicroDem the other night to get terrain data and it just gave me a
Tom, I don't have any experience with this product, but it is purported to do what you want: http://www.tennadyne.com/slipp_nott.htm Mike, W4EF......... ______________________________________________
Dick, If I am not mistaken, the lumped loading on the 402-CD causes the 3rd harmonic resonance to fall in the 17 meter band instead of the 15 meter band as you would get with a full size element. If
_______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any quest
I've got a book here with some old G.H. Brown data. This is probably ~1 MHz data. It shows about a 6dB difference between 2 quarter-wave ground-mounted radials and 15 quarter-wave ground-mounted radi
This discussion brings up a good question. What is the best what to make accurate inductor Q measurements? I understand that there are Boonton Electronics Q meters out there. How do those compare wit
Yeah, I am at 1700ft ASL which sounds impressive until you realize the the mountain next to me is around 4000ft ASL :) If you ever want experience first hand the contrast between a good DX QTH and a
I found that a good method is to use the MFJ259/269 as an RF source driving a 50 ohm pad in parallel with the open stub under test using a T-connector. I connect the output of the pad to a spectrum a
In terms of the phase of the current delivered to the load (what we care about when driving antennas), the current phase error won't necessarily be equal to the length error even if the source is mat
Julio, That great cuban food in South Florida is what makes it worth putting up with the big roaches, the humidity, and the hurricanes. I really miss that part of it. 73 de Mike, W4EF (Ex Floridian).
Oh my god look at the size of that antenna! 73 de Mike, W4EF [sorry Steve, I couldn't resist :):)] _______________________________________________ See: http://www.mscomputer.com for "Self Supporting
Sometimes Google is frightening: http://www.pbarch.com/thestaff.htm http://www.pbarch.com/telecommunications.htm Mike, W4EF...................... _______________________________________________ See:
That was my experience with a 80 meter dipole 10 feet off the ground, Jim. It had a very pathological input Z. With "reasonable" mistmatches my T antenna network tuner easily handles the ~1.2 KW outp
Mrs. Tope!! BTW, in this particular case, remote operation would offer one more advantage - it would put me hundreds of miles from the rotten egg smell the permeates the Salton Sea :):) 73 de Mike, W