Posted By: Stuart Sweet July 9, The argument is either that the mast blocks the signal or that it changes the reception pattern my nature of its even being there. So, it seems like a great subject for an article. What about those who say that the mast blocks part of the signal? Whatever they make the windows on spaceships out of is probably a good candidate there. I wonder if you could rig a series of high-power magnets to keep an antenna in position?
Maybe a series of cables made from carbon nanotubes. Nanotubes can be made into super-strong, super-thin fibers and might work. Maybe, you could build a pyramid out of something non-conductive and transparent to RF like that white plastic they put on the back of some smartphones.
I bet you could 3D print something like that, or maybe cast it using a giant mold. Folks, antenna masts can be steel or aluminum or whatever; as I said the antennas are designed so that the mast has little or no effect on them.
If you do need an antenna mast, or a whole new antenna, shop the great selection at Solid Signal. Facebook Instagram Twitter YouTube. Home Tutorials. Is the mast really a problem? OK now, this is getting silly. Seriously though… If you do need an antenna mast, or a whole new antenna, shop the great selection at Solid Signal. About the Author. He is the author of over 6, articles and longform tutorials including many posted here.
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Average rating: 1 out of 5 stars, based on 1 reviews 1 ratings.QRZ Forums. Is this worth doing if I don't cut the elements?
Trying to work with its original gamma match and trying to replace it with a hairpin match simply isn't working. The best SWR has been 2. Since I understand the idea of the hairpin is to raise the impedance, it seems I'm not doing something right.
The driven is separated into two pieces insulated from the boom clamps by tape. I retained the original gamma match components as well so I can go back to that if the hairpin continues to fail. It probably doesn't help that the SO mount plate is right there as well. Thank you for any tips or suggestions. K6MSMJul 23, You can try to get 50 Ohm, or close, but I am not sure if you will get something out from the antenna. I meant, even if you can get good VSWR, the antenna is calculated forhence, from the radiation point of view, performance on will be reduced You can try a Gamma Match.
It looks like this antenna is a Cushcraft AS. Cushcraft also makes a version more suited for the higher frequency part of that band called the AS. If you look at the element lengths of the higher frequency antenna you can see they are all a bit shorter. The exact dimensions are in the manuals. You say you don't want to cut the elements, but I don't think the antenna will perform very well without this.
Sure, if you knew what you were doing you could adjust the match at the driven element to have a better SWR, but the antenna pattern would be worse and the gain likely a bit lower as well. If you just want to see if you can get the SWR down, then step one is to calibrate your VNA at the end of the coax cable that connects to the antenna feedpoint.
This way you can measure the impedance of the feedpoint. Otherwise you will be guessing. You need both the resistive part of the impedance and the reactive part.
If you measure the feedpoint impedance without any matching structure, then you can decide what kind of match is needed.
If you have already done this and the plot you showed represents this condition, then it seems that the impedance at The picture is a bit blurry and so I am not completely sure.
But it looks like it says Ohm plus Calculating the reactance at You could use an LC match calculator to give the matching structure you need. This one at analog devices allows single ended or differential solutions.
This is one solution : You could use a hairpin match of about nH across the driven element with an additional series capacitor of about 2. Last edited: Jul 23, This is very helpful especially the part about how to change the inductance to j. It makes it clear now that a simple hairpin isn't going to work. Thank you! I looked up the AS and that's definitely it and I see it it still made.A Yagi—Uda antennacommonly known as a Yagi antennais a directional antenna consisting of multiple parallel elements in a line,  usually half-wave dipoles made of metal rods.
The reflector element is slightly longer than the driven dipole, whereas the directors are a little shorter. The waves from the multiple elements superpose and interfere to enhance radiation in a single direction, achieving a substantial increase in the antenna's gain compared to a simple dipole. The largest and best-known use is as rooftop terrestrial television antennas but it is also used for point-to-point fixed communication links,  in radar antennas,  and for long distance shortwave communication by shortwave broadcasting stations and radio amateurs.
The antenna was invented in by Shintaro Uda of Tohoku Imperial UniversityJapan with a lesser role played by his colleague Hidetsugu Yagi. However the "Yagi" name has become more familiar with the name of Uda often omitted. This appears to have been due to Yagi filing a patent on the idea in Japan without Uda's name in it, and later transferring the patent to the Marconi Company in the UK. The Yagi—Uda antenna consists of a number of parallel thin rod elements in a line, usually half-wave long, typically supported on a perpendicular crossbar or "boom" along their centers.
The directors are slightly shorter than the driven element, while the reflector s are slightly longer. Conveniently, the dipole parasitic elements have a node point of zero RF voltage at their centre, so they can be attached to a conductive metal support at that point without need of insulation, without disturbing their electrical operation.
The gain increases with the number of parasitic elements used. The Yagi—Uda array in its basic form has very narrow bandwidth, 2—3 percent of the centre frequency. Yagi—Uda antennas used for amateur radio are sometimes designed to operate on multiple bands. These elaborate designs create electrical breaks along each element both sides at which point a parallel LC inductor and capacitor circuit is inserted. This so-called trap has the effect of truncating the element at the higher frequency band, making it approximately a half wavelength in length.
At the lower frequency, the entire element including the remaining inductance due to the trap is close to half-wave resonance, implementing a different Yagi—Uda antenna. Using a second set of traps, a "triband" antenna can be resonant at three different bands.
Given the associated costs of erecting an antenna and rotator system above a tower, the combination of antennas for three amateur bands in one unit is a very practical solution. The use of traps is not without disadvantages, however, as they reduce the bandwidth of the antenna on the individual bands and reduce the antenna's electrical efficiency and subject the antenna to additional mechanical considerations wind loading, water and insect ingress.
Consider a Yagi—Uda consisting of a reflector, driven element and a single director as shown here. All the other elements are considered parasitic.
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