On Fri, 23 Jul 1999 13:40:15 -0500 Richard Thorne <rthorne@tcac.net> writes: The real limitation on receive is not absolute signal level, but rather signal-to-noise ratio. That's why hardline always
It is possible to have the 40 meter feedline just the right (or wrong) length to make the 40 meter driven element resonant or near-resonant on 10, 15, or 20. A quick way to test for this condition is
The KLM KT-34XA didn't get a fair shake in that report either. In addition to the range layout problems, there was apparently something defective in the KT-34XA used for the report, causing high swr,
On Tue, 22 Jun 1999 23:45:38 -0700 henry gillow-wiles <henry@pacinfo.com> writes: Henry, You can download the program YTAD from the ARRL fileserver, or oak.oakland.edu, and it will help you answer al
In my 1996 catalog, it's page number 8 in the Rohn 45 Section. The drawing is titled "Foundation Detail Bracketed 45 Tower." It's the page just before the guying diagrams. Dave Hachadorian, K6LL Yuma
Here's a mechanical engineering analysis from an electronic engineer. Consult a PE before using this as a final design. Rohn dwg. C630645 states that the moment capacity of a 45G section is 11,400 in
Please disregard the posting I made a while ago regarding the adequacy of a particular concrete base for self-supporting Rohn 45. It turns out that I misread the spec on Rohn 45, and the tower sectio
This is my recommended method. c is a remedy for b, so don't list it separately. Put some plywood near the hole for the bucket brigade to walk on, so they don't collapse the hole. Exercise is good fo
This is interesting discussion. Consider the following simple setup: Take a standard gin pole, run the rope through the pulley, but instead of attaching the rope directly to the load, run the rope th
Secure the rope firmly to the top of the ginpole mast, not the top of the tower. Dave Hachadorian, K6LL Yuma, AZ K6LL@juno.com ___________________________________________________________________ You
Regardless of what the KLM techs or "From the Horse's Mouth" say, I wouldn't screw around with reflector or director measurements to reduce swr. I would put those measurements back on nominal. It's p
I sent this message last night, but haven't seen it posted yet. Here it is again. Forgive me if it turns out to be a dupe. Dave Hachadorian, K6LL Yuma, AZ K6LL@juno.com Regardless of what the KLM tec
If you want some hard facts, look at my contest scores for the last 12 years. KT-34XA at 49', 40-2CD six feet above that, booms aligned. If you want to hear my 15 meter signal, drop me an email. We c
On Mon, 29 Mar 1999 08:23:19 -0500 "Tony Bean" <tonybean@bicnet.net> writes: You should download the program YTAD from the ARRL's file server. You could also purchase the ARRL Antenna Manual and get
I didn't see the original posting on this, but something is wrong here. A 10' stub made out of rg-8 or rg-11 should have an impedance minimum of about 0.5 ohm. I just tested my 40m shorted stub, made
I'm not sure about YT, but its predecessor, YTAD, generates a file called OUT.PRN that contains this data. Dave Hachadorian, K6LL Yuma, AZ K6LL@juno.com ______________________________________________
Good advice, but make sure the other tower is far away from the existing tower. When the first tribander's directors are facing the second tribander's reflectors, the first will be seriously degraded
On Wed, 13 Jan 1999 19:17:45 -0700 Steve Zettel <zettel@homer.libby.org> writes: Rather than using swr, I think it would be more accurate to use the impedance method described in the RF-1 manual. Put
Here's my favorite method: 1. Cut the stub about 2 feet longer than the calculated length. 2. Put a PL-259 on one end. 3. Make sure the stub presents a low impedance at the frequency you are trying t
The four bolts that hold the two halves of one of my Ham-4 Rotors have loosened up. In fact one of them has fallen out and I can't find it. Has anybody tried Loctite Blue on these? Anything special a