I have some questions about the top loading in shunt-fed tower systems in general, and more specific to my case, half slopers (which have been described as "a lazy man's shunt-fed tower"). 1. Other t
Bill, I wonder if the triple sloper systems aren't acting as a very sparse discone? If so, improvements could be made by adding additional sloping (skirt) wires and detuning the tower below the attac
Related topic...from K0RF on the 3830 reflector: triple slopers fed at the top of 4 of my towers at 120 feet. It has a good pattern and hears pretty well. No radials. Can't put them here. I felt loud
Hi Paul, For 160, I would shunt feed the tower and forget slopers. If you are using a side arm for the low antenna, the face of the tower opposite the leg with arm and rotator can be shunt fed if you
Pete: Going only by memory, I did have a quarter wave sloper on my 120ft. tower. This was some time in the late 80's or 1990 or so. As I remember, it got out surprisingly well. I remember being able
Jim.....You hit on a good point with a 1/4 sloper that it should be some distance, in your case 5 feet, from the tower at the top or high voltage end. Having the top right at the tower seems to deter
Jim.....You hit on a good point with a 1/4 sloper that it should be some distance, in your case 5 feet, from the tower at the top or high voltage end. Having the top right at the tower seems to deter
Herb, That depends on the height of the tower. I have two sloping wires on opposite sides of my 110 ft tower (with SteppIR and 2M long Yagi on top) that are INSULATED from the tower and each fed from
I have to modify some of my quick answers. K4SAV: I answered this question a little too quickly and without details. The Yagis don't contribute any significant radiation to the total if they are symm
"Anyone had try (shunt fed vs. sloper) and compare them?" == Yes. On 80m, it was no contest. My shunt fed tower was far better than my 1/4-wve sloper. 73, de Earl, K6SE ______________________________
If doing this - make sure to notice the error in the ON4UN book that says to adjust the current in the detuning loop to minimum. The correct procedure is maximum in the detuning loop. Or, another wa
Congrats John. I would like to point out that this score has not been obtained just by having the biggest signal on the band and calling CQ all night. First off, K5NA was much louder up here during
No question about it......a single 1/4 wave sloper fed at the BASE.......has a F/B of about 1/2 dB..and a F/Side of about 2 dB.......adding the 2nd one behind it...and making it 5% longer turned the
Don, WD8DSB wrote about his experiments with the "half sloper" antenna. Modeling shows that the predominent radiating part of the half sloper is the tower itself, rather than the sloping wire. Polari
Bob, I used to use an Inverted Vee at 40meters high which had 50 meter long elements. I used a motor driven capacitor accross the feed line to tune it. This arangement worked great on topband until I
One trick to alter the resonance of an antenna like a sloper or an end fed inverted -U recommended by the late G5XB would be to put a varible capacitor between the remote end and ground. This would a
Author: AC0RL via Topband <topband@contesting.com>
Date: Fri, 12 Oct 2018 14:02:00 -0500
In response to: Recently Tree did some work for me and one of the things was to put up the Comtek 80 meter 4-Square switching unit and a couple of pulley setups for my raising of the 80 meter slopers
You're certainly right that comparative field strength measurements are the only good way to determine how well a given antenna is working, and I agree that one of these AM broadcast FSMs would be a
Direct fed at the top, with the coax braid grounded to the tower. No radials needed. Ive used 1/4 wave slopers for 40, 80 and 160, with towers between 48 and 66 ft tall. On 40m dx performance was out
FYI concerning my 80 meter 4-Square using sloping dipoles.... I have now disconnected all four 75 ohm links from the Comtek box. The 75 ohm stubs are just left hanging, not shorted or anything. Comte