Another point. There is a bit of a double standard in being picky about that gain really being elimination of attenuation. Say you have a trap beam with a lossy trap that measures 3 dbd gain, and you
See below. 73, Guy. mechanism Where back into make the It is not necessary for elements in an RF system to be literally interconnected by wires. If it were, transformers would not work. Yagi's would
This is a forward of a commercially related inquiry, but as it is for defense in a time of hostilities, and is not a classified inquiry, I thought I would pass it on. I seem to recall part numbers th
In the noise 1.7 can make a signal copiable. It may not make much of a difference in a given pileup. And a lot of people cannot discern even a 3 db difference, HOWEVER... Over the course of a contest
Egads... I have 1 1/4 up my Trylon. It took three guys on the ground to pull it up slow and easy, keep from whipping it around and throwing a kink, and keeping it up there while I got enough clamps o
Suggest that you get on force12talk@qth.com, subscribe if you need to and pose the question. Natan reads the reflector and often answers these kinds of questions. When you have feedlines attached to
Construct the boom's feedline with the inversions, etc and use a single source. Only way you actually will model the REAL performance closely. Multiple sources allows you to specify levels and phasin
Verticals on 160 are notoriously rotten as receiving antennas due to all the crud they hear, even if it has been shaped up as a top flight transmitting antenna. Beverages to listen with! No room, try
If you have a "random wire from a high structure, I would suggest a popular antenna from the 60's: Cut it to 133' and insulate the rest. Depending on the convenience, break the 133' 49 feet from eith
I dunno if that was a illustration of his age. It certainly was an illustration of his commitment to safe climbing. All it takes up there is a moment of inattention when you're not fastened on, and y
After seeing many monster antennas and helping construct some, it is quite clear that a lot of the success enjoyed by mini-watt transmitters using noodle-class antennas is due to a superb station mak
I suspect that this is not so much a matter of where the main radiation pattern is, as where the nulls are in respect to the incoming angles. Very high antennas have better gain at the lower angles i
Nulls are not caused by "angle of elevation" of the yagi boom. For all practical purposes their angle is fixed by the frequency and height of the antenna. They are caused by the cancellation of waves
The null-filling idea depends on one of two concepts: 1) ground clutter or irregularity filling nulls because the ground is not a smooth reflecting plane. Effects of this can be seen with programs li
Working for a large software house (SAS Institute) I am often struck that the meanest critic of our stuff is ourselves, who wrote it. I think that's really how customers want it. My own view of quali
N4AF has his antennas in the middle of a BIG, FLAT, slightly soggy meadow, water table no lower than maybe 5 feet, about 30 feet MSL, to north through east sloping very gradually to Pamlico Sound, ab
What the model DOES predict is that the dipole has a weakness at very low arrival angles that the vertical does not. The model *AND* your comparisons tell me that stuff is likely coming in at very lo
Actually the earlier models had three yagis on the same boom. First all of one, then all of the next, then all of the last. That was three monoband design, one in front of the other. Thus the genesis
For top loading, only the ones which are FARTHEST away from the base will count in the effective height. The 85 footer will do it. Removing the insulating PVC from under the end 20 meter director, th