No one on the SteppIR yahoogroups forum has responded to my posting. Maybe some Towertalkians are interested and knowledgable? Jerry, k3bz, sets forth an interesting concept that tuning the SteppIR e
Al, Your summary of how yagis work is substantially correct. If you want to really understand and predict how antennas work, you need a lot more than "trigonometry". It's one of the most complicated
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 28 Jul 2006 15:36:54 -0400
73 Roger Halstead (K8RI and ARRL 40 year Life Member) N833R - World's oldest Debonair CD-2 www.rogerhalstead.com (Use return address from here) _______________________________________________ _______
That's a fairly good description Exactly.. there's an effect just from distance (i.e. if you were a quarter wavelength away, the incident field is going to be 90 degrees lagging) and an effect from t
Nice response Jim. One comment regarding the statement that "The composite wave strength may be greater or less than that from the driven element alone. . ." This may be true in the sense that the fi
yes.. I like the "squishy water balloon of constant volume" analogy for antenna patterns. You can poke and prod it into a bizarre shape, but the overall power remains the same. I think it's, to a cer
I guess I don't understand why someone would want to do all this to shift the pattern of the antenna in a different direction. Why not just rotate it in the direction you want the pattern to go? I do
Oh--OK--yeah that would be neat. That way you could have an antenna set for domestic contests with a high takeoff and for a DX contest with the low angle. Now, that is something that needs to be wor
The original question ( http://lists.contesting.com/archives//html/Towertalk/2006-07/msg00834.html ) inquired if the angle of radiation could be changed by adjusting the element lengths of 3 element
The original question ( http://lists.contesting.com/archives//html/Towertalk/2006-07/msg00834.html ) inquired if the angle of radiation could be changed by adjusting the element lengths of 3 element
The original question ( http://lists.contesting.com/archives//html/Towertalk/2006-07/msg00834.html ) inquired if the angle of radiation could be changed by adjusting the element lengths of 3 element
Yeah, stack two of them to do that. N2TK, Tony Oh--OK--yeah that would be neat. That way you could have an antenna set for domestic contests with a high takeoff and for a DX contest with the low angl
In addition to stacking, feed one through an adjustable phasing network to steer the pattern to the desired vertical angle. 73 de WOØW _______________________________________________ _________
yes, but changing the relative lengths of the elements (which is what the SteppIR is all about) *can* change the vertical pattern: by changing the relative phases of the element currents to change fr
Sure.. two antennas would make it easy, but with the SteppIR, you can do it with just one. Not necessarily the same performance as a dual antenna setup, but might be good enough. After all, for the l
In some cases, one might not even need the phasing network. You could set one antenna to present a inductive feedpoint impedance and the other to have a capacitive reactance, and get your "phase shif
I have modeled a lot of antennas for a lot of years, and I have concluded that varying the yagi height will change the take-off angle much more than any amount of varying element lengths. Varying el
In some cases, one might not even need the phasing network. You could set one antenna to present a inductive feedpoint impedance and the other to have a capacitive reactance, and get your "phase shif
John says: "Turning the antenna (even with an azimuth rotator) won't change the angle of radiation." I think he means elevation rotator. --Original Message-- From: towertalk-bounces@contesting.com [m
. I have found that on 20 meters both my four at 45 feet and my four at 85 feet do better than both. Seems like a phasing problem but on the other bands..............K2HK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~