Bought a 432CP42UG from M2. Would you believe that of 21 pair of elements, 14 PAIR were the wrong size? 13 pair were 1/16" off. 1 pair was 1/8" Never, never again. 700$ waste. It took me 2 hours of p
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Mon, 13 Apr 2015 07:37:06 -0500
I'm not a Yagi guru or an EZNEC modeler. Can someone tell me what 1/16 of an inch in element length means in performance parameters in the example below? I have done mostly wire antennas and 1/16 or
Hey Pat! How do you assemble an antenna when the elements are not the size listed on the diagram?? 42 pieces of utter confusion. Read before commenting, please!! Norm n3ykf __________________________
this is a 432 MHz antenna with a lot of elements where the elements are about a foot long overall. 1/16" if it's on both sides, is shortening the element by about 1% The element lengths are critical
You have 420-440 MHz wire antennas? John KK9A I'm not a Yagi guru or an EZNEC modeler. Can someone tell me what 1/16 of an inch in element length means in performance parameters in the example below?
Do have a question. How does one characterize an unknown antenna's parameters? If I understand it correctly, to characterize the "real world performance" (using the sun) of this type of antenna, G/T
I have a number of M2 antennas and I have only had one problem. I called them and they corrected it immediately by shipping the correct part. I have difficulty believing they won't correct a mistake
Hello Of course that they will solve any problem, and mostly with new antennas Many years ago, 2 weeks before a major contest, we assembled the 20M5. The insulator for the driven element was wrong, d
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Mon, 13 Apr 2015 09:06:57 -0500
Blind obedience to the instructions is no guarantee of success. I once snapped off several 1/4 inch stainless steel bolts with a torque wrench set to the specs in the printed instructions. A mech eng
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Mon, 13 Apr 2015 09:15:20 -0500
I used to experiment with antennas more than I do now. Maybe we need to "normalize" what we call wire. In some experiments I have used copper coated welding rod (for gas welding not arc welding) in s
Some form of antenna range. Sun Noise works, sort of, but the problem is that unless your antenna has a very narrow beamwidth, the sun is "small".. The sun is 1/2 degree wide. If you have a 20 degre
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Mon, 13 Apr 2015 09:30:06 -0500
Sorry for the bonehead comment. I was not thinking small antenna as I am working a LARGE antenna project. My fault. Yeah, 1/16 is a fair error in that size domain. Odd that the supplier won't make it
Thanks! I do understand. This makes the math a lot clearer. Regarding the orbiting signal generators, if the spacecraft is in LEO, then the accuracy of the tracking becomes "noise" on the measurement
Thanks! Sorry for the sharp reply. Having spent much extra time on a puzzle that was supposed to be an easy 8 hour project it's a bit of a sore subject. Got some CNC aluminum from them for a KT34a up
Regarding the orbiting signal generators, if the spacecraft is in LEO, then the accuracy of the tracking becomes "noise" on the measurement? Are there any spacecraft that you could suggest? I'd look
Patrick, There is no possibility of being wrong measuring these. Used an adjustable (tongue) square to get a correct length measurement. Just did our master bath. Kohler, Toto and Vigo fixtures, cust
Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Mon, 13 Apr 2015 14:03:21 -0400
Norm, this may be out in left field but I have been there before. Some vhf/uhf yagis don't have the longest element as the reflector; the d.e. is actually the longest element. Could this be the case
Gerald, The element lengths do not correspond to the callouts on the instructions. That's 28 of 42 elements. More than a 50% screw up rate. So how does one know what element goes where in that case?
The vertical elements are all shifted along the boom relative to the horizontal ones. Therefore a vertical and horizontal element which are adjacent to one another are not necessarily a "pair" and wi
John, I wish it did. Believe me when I tell you that all angles were covered. When I say "pair" I mean the like sized elements in V and H, . Did pay attention to the details. As you say, this is tric