I had a similar situation yours, except I had an 80m shunt feed on my 15m tower, and needed something for 160m. K9AY originally gave me this advice - run the shunt as high on the tower as possible, t
One of the things I picked up at a recent hamfest is the remote head for a rotary antenna switch. The switch is nearly 6" square, although one side is only 4". It has 6 SO-239 connectors and a termin
I use a shunt-fed 15m high tower on 80m and 160m. The matching network for 160m consists of an L-network. The series inductor is tapped about 45 turns on two stacked T200-2 cores. Probably about 70 u
I have a similar problem. I shunt feed a bracketed tower, so there's a whole quadrant that is blocked by the house. I laid my radials out on top of existing grass, held down with small loops of 12 ga
Could be! I think it might have been a remote switch box that worked with the Drake station console. I've cleaned the unit up and found a 25v AC transformer that turns the switch nicely. Thanks! Bill
The important question is - how high is it? 68 feet is not very high with respect to 160m. Consider that a half wavelength is 270 feet. 68 feet is barely 1/8 wave high. At that height, and with the i
AM broadcasters usually spec out 120 1/2 wavelength radials. That's considered an excellent radial system. In general, so long as the ends of the radials are within 0.025 to 0.050 wavelength, a set o
This conflicts with my sense of efficiency and conservation. If something is so worthless to you that you would toss it away, why deny it to someone else who might find it useful? Bill Coleman, AA4LR
However you slice it - that's a big difference in price.... Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 __________
120 ft / 280 ft = 0.43 wavelength high 190 ft / 280 ft = 0.68 wavelength high It's generally considered that horizontal antennas don't have much of a directional pattern until they are 1/4 wavelength
$1.00 is a much higher price than $0.00 .... Would you pay a dollar for something that someone else was giving away free? Then tell them you'll fix them for your standard service price (perhaps given
I'm checking my calendar again. Did April come early this year? Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ______
Polyethylene is certainly strong, although a rope capable of holding 4000 lbs would be pretty thick. One problem with Polyethylene is that it degrades under UV radiation from the sun. The UV breaks t
While EMT may LOOK sturdy, it is NOT a structural material. That said, I have used a 10 foot piece of 1.5" rigid EMT with an additional 12" steel nipple to support a Cushcraft R7000 at 8 feet. (eg 3
Can't one use a sacrificial anode to avoid exactly this sort of galvanic action? Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wr
So, how do insulators on the guy wire (especially if the guys are phillystran or fiberglass rod) prevent galvanic corrosion of the guy rod in the earth? From what I understand of reduction-oxidation
I'm having trouble with my shunt-fed 15m tower. I have an L matching network that is switched between 80 and 160m. A relay selects different taps on the inductor, and also adds capacitance for 160m.
Yes! All sections are bonded together with No-Al-Ox. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 _________________
I swapped out the coax with another line - same problem. I doubt the tower section joints are a problem, although the rotator might be interesting. I was thinking more like it might be a problem in t
Had a problem like that with the 80m cap. A shot of LPS 3 and a few rotations seems to have cured that. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man