stack, I think Tennadyne's analysis misses several points. Most important is the beneficial broadening of the first vertical lobe in the stack, which makes a big difference when you compute the avera
I have a shot at several reels of 75-ohm unjacketed 3/4" aluminum hardline that are surplus to the needs of the local cable company. The only thing that seriously concerns me is that they have been s
Too many people responded for me to list them all. Thanks for the encouragement. It looks like they may have over 1000 feet total that is just sitting there, waiting to be sold as scrap. Now on to th
Thanks again to everyone who responded. The consensus was that I should ask them to pay ME, if I take the spools away. I'd just as soon avoid that, but we'll see. Thanks, everybody. 73, Pete N4ZR Che
Basically, everyone said that you can just trim back a little and go with it. K1VR suggested 1 foot per year stored outside, while others said just to look at the end and trim till everything looks c
Is there a theoretical reason why the gain resulting from stacking two HF yagis over real ground is limited to 3 dB? I have a model of two C-3Es that shows 3.5 dB increase over a single C-3E in the t
Another possible option would be a Bobcat -- I think the scoops on them take about a yard at a time. When I was doing this a few years ago, a lot of people warned against the Georgia buggie because o
I think they come in several different sizes, but it's been long enough that I remember only my aching back and what seemed like only one Bobcat trip per guy anchor -- I was the guy with the shovel o
I once took apart a Classic 36 that had destroyed itself during a microburst on an office building roof in Washington, DC (agency concealed to protect the guilty). As I recall, it had an odd feed sys
Only if you drive them with a tube amp using Type 20s and feed them with some of that mega-super speaker wire. Oh, and don't forget, no terminal strips allowed in any equipment you build!!! 73, Pete
I've been using YT for years. Recently, I upgraded my terrain profile to Europe to one with much higher accuracy than before. The profile is essentially flat within about 50 feet out to 2 miles, but
Actually, I think Tom's getting a bum rap on this one. As I read the article it only has a couple of messages: Antennas are fun. You can have a lot of fun with a minimal antenna, but you'll have more
A lot higher than 4-6 wavelengths. I ran a 10m yagi in EZNEC at 200 feet above ground, and both the deep nulls and reflection gain were still fully evident. 73, Pete N4ZR Sometimes a tower is just a
Sorry, but I don't agree. This modeling software (NEC-2) would be of no use at all if it hadn't been extensively verified against the real-world situations that it was developed to model. There are k
I'm considering installing a trap vertical (HF-9V) for 80-10 meters. I have two possible locations for it. One is in the center of a 30 x 40 foot steel building roof, about 10 feet off the ground (an
As Tom's explanation of null formation suggests, some foreground slope angles and distances from the antenna may actually deepen a given null or nulls. I think there is probably another phenomenon at
VARIABLES EZNEC uses the NEC-2 engine, which was developed for the US Government, at great expense, and is the best thing currently available short of NEC-4, which is very expensive to end users, eve
Again, I disagree. For a flat, smooth foreground, the change in the real radiation pattern IS smooth and predictable. Then you put the same antenna over an irregular foreground, and of course the res
I think you are. The US Government spent a lot of money doing tests to verify that NEC-2 and 4 represented good approximations of the real world. The situations in which this approximation breaks dow