You can back out the value of X using the SWR and value of Z. The formula is in the AUTEK manual. The sign of it is easy to determine. First find the resonant freq. If your freq of interest is higher
I'll take Tom's word on this. I haven't used this for antennas with feedlines built in --e.g. the GAP verticals(?). I think plotting the value of X vs frequency as suggested, will tip you off. If it'
Guys, About 8 months ago QST had an article on the TLW program. It also comes on the CD-ROM for the 19th Edition of the ARRL antenna handbook. It allows one to do all kinds of neat things. Given a me
ACOM 2000a handles 1500w RTTY with no sweat-- but a lot of heat. Brought room temp up to 90+ degrees with windows open, outside air temp in the 70's and a ceiling fan. No fooling mother nature. That
Guys, I'm beginning to think that leaves on the trees is adversly affecting the directivity of my beverages.. or the phase of the moon or...? All 7 of them don't seem to show the directivity on 160/8
Some observations. What you need depends upon several factors: 1) Indoor vs outdoor 2) Silver plated/nickel plated connectors 3) Diameter and type of solder used. I've found a 100/140 watt Weller sol
Ditto on their smaller brother which operates 80/40/20 etc. It was horrible on 80 but reasonably good on 40. By the way, one has very small bandwidth on its lowest freq band. At least for the 80M ver
Guys, Be really careful with balloon anythings. You might end up snagging an airplane. The problem is a balloon/ant configuration that breaks somewhere else than right at the balloon. The trailing wi
You missed the point. It is the ballon that snapped the wire somewhere and is now loose trailing 100' of wire that is the hazard. Also, when it comes down, that wire can fall across power lines. 73 d
CQ's July issue had an article on a horizontal loop. It was entitled" Remote tuned Loop for HF DX" The article pulled no punches on the difficulties of matching this antenna on different bands. The a
What is the basis for this statement? There doesn't seem to be any analytical support for it. How about some specifics. What kind of "DX" they are better for and why. List Sponsored by AN Wireless: A
I modeled a 160M dipole at 54' in EZ-NEC and compared it to the CQ July 2001 article describing a 160M full wave loop 135' on a side. At 20 degrees elevation angle (what info was shown) the two compa
Once again the theory is outvoted by personal endorsements. Frankly, models can save you a lot of time by having you NOT put up something that won't be an improvement. Chances are quite good if you m
I'd be very leery of measuring the resonant freq of this loaded element close to the ground. The resonant freq of a loaded 40M 402cd changes many hundreds of KHz from the ground to 70'. It measures t
Main concern is when the tower is being tilted. Put too much extra weight at a large 15' moment arm and you might be in a grey area. I don't know if it is OK or not. However, I had an EZway tower wit
Paul, Here are the "tuning" instructions GEM quad supplied. All elements except driven elements have a two wire stub hanging down shorted at bottom. Stub lengths of 15" on 20M, 12" on 15" and 12" on
Steve, Have you tried tuning the Force 12 coil/hairpin combo on their 40M yagi antennas? Equally a pain. IMHO potential quad owners need a tilt over tower, a HAZER tower or a friend with a cherry pic
Also had problems with adding 12m quad to a 10-15-17-20M 4 element GEM quad. These four bands coexisted very well even with a single feedline. Looked at it in AO and the patterns on all four bands we
I guess this is "typically" true for some crank-ups. However, if the crank up design has a foot or latch which carries the load after erection, then then cable strength is not limiting. EZ way towers
Now for some reality. You won't be happy with your antenna. Your tower will grow additional antennas in the future. You antennas will get larger. If you are lucky, designing it for 110Mph will permit