I have a Cushcraft 402-CD right at the top of the tower and a KT34XA 12 feet above it on a 4130 moly mast. I put the 40 meter beam at the bottom because it is more likely to need service and to keep
Mike, My bet says it is power supply related, but either way you have to narrow down the exact source of the problem. Start with everything up and running. Power down printer, monitor, etc one at a t
Have at it. I bought my Rohn 45 as a used red/white painted broadcast antenna. I rented a commercial power washer to blast off the paint and clean up the few rusted chip spots prior to painting it wi
LMR-600 is 50 ohms. Shouldn't be any problem. http://www.nr6ca.org/pdf/LMR600A.pdf If it were 75 ohms the simple answer would be that it would bump the VSWR of a matched 50 ohm system to 1.5:1. For t
Try an AI1H broadband dipole. This has worked well for me on 80 meters. I operate mostly CW but it covers most of the phone bands also. It's shown here on page 9. http://vss.pl/lf/08.pdf It's discuss
Brian, Selecting the right bead is only the small part of the problem. The more important part is knowing where to put the bead. You didn't describe the noise other than that it is occuring at lower
It shouldn't matter where the line of demarcation is between open coax and the coax running through the conduit. Whether you run the conduit to the top of the tower and put your polyphasers at that p
Sure there are better places to put the polyphasers. My own are located where the coax penetrates from outside to inside the building. The point was that they need to be put at the "boundary" between
Getting to the first set of guys is always the hardest part of installing a pier pin installation. I tip up the first 20 feet (with the aid of a tractor bucket), tighten up the temporary guys (at 20
The pier base is supposed to have that little bit of give at the bottom so if the tower twists in the wind (real tall towers) it doesn't fatigue where twisting tower meets immoveable concrete. It's a
I also built steps for my mast when I built the tower. I haven't used them yet as I haven't needed to service the antennas above the tower yet. That's going to change soon as the top yagi is acting u
Definitely too many variables going on to make the calculation easy and straight forward. Effects of height above ground, the actual ground parameters, and whether it is in an inverted vee configurat
Those are the same insulators I have seen on the base of a Hy-Tower vertical. So could be a Hy-Gain. Could be a homebrew, but that coaxial balun housing looks commercial. Earl N8SS -- Message: 1 Date
Looks like everyone covered that you need to know the sign (capacitive/inductive) as well as the magnitude of the impedance. Here's a brief tutorial that shows what happens to an impedance as it is t
Try the Coaxial Resonator Match (AI1H) dipole. It has the double dip you are looking for and covers almost the entire 80M band. It is essentially an electrically OCF dipole made with coaxial cable. T
The 31 material will give you more common mode impedance at the lower frequencies than the 43 material. Depending on the core size and how high in frequency you are going you might be able to get awa
I have always used a clove hitch with an extra turn ( http://www.realknots.com/knots/hitches.htm#mwvsl ) which I tie just above center of gravity on the mast to prevent tipping on the way up. Never
Tighten it the same way you would if you were stacking it. From the bottom up. It will be hard to straighten it if you tighten the top guys and then have to straighten out a bend in it at the lower g
In the mid 90s I went in with a couple of guys and bought 400 feet of used Rohn 45 that had been an AM transmit antenna. It was painted red/orange and white. The paint was old enough that it was fad
It is easy science and engineering to make the tower base infinitely large, the cable permanently greasy, the ground plane perfectly conductive, and the guy anchors infinitely stout. The real work c