I seem to remember that ant and another person who claimed to get a goo match with a sloper fed with a i think 1/4w of wire conected at abt 2` from base of tower .I have lost them notes . I put up a vertical abt 50 ` high with top bottom capacity hats, 120` long.Now this was suspended in a tree 80` high, and with 100 watts was heard, and nearly got a contact with a US station, but he had local qrm. But worked Cape Verde Isles and the Azores as a consolation prize. thanks.. EI7BA And Mr Stevens. Roll on the first or March. 73`s G8CCL
On 17 February 2015 at 12:16, Stan Stockton <[email protected]> wrote: > A good analysis of all this can be found from IV3PRK as he planned his > antenna for his new QTH in HC land. > > http://www.iv3prk.it/user/image/site2-inverted-l-vs-vertical-t.pdf > > 73...Stan, K5GO > > Sent from my iPad > > On Feb 16, 2015, at 6:14 AM, Tom W8JI <[email protected]> wrote: > > >> Tom, Thanks for the details on the "Z" for TB. On a related matter I > have been looking for comparisons between a "L" and a "T" firmly believing > that a "T" would be better as in 65' up and 135' horizontal fed in the > exact center. However there are so many TB'ers using "L" rather than "T"s > which begs the question....why? You need two supports for the "L" but how > much do you gain by converting this to a "T" with even a modest ground > plain of 6-12 radials? Or is it just a matter of convenience and lot size? > > > > There is almost no difference between the T and L. It is mostly a matter > of what someone can fit. > > > > When I lived on a city lot, I had restricted antenna room. I installed a > "G5RV" between two tall pines. I dropped the feedline vertically to the > ground. I fed the entire thing as T on 160, and I managed to work many > JA's, VU, UA0's, VS6, and even a JT on 160. An L I tried was no different, > but too many wires cluttered an area and makes an RF mess out of things. > The G5RV gave me a good 160 antenna (fed as a T) and a pretty good 80-10 > antenna, with just one wire and one feedline, using a tuner right where the > feeder came to ground level. > > > > I installed a 100 ft vertical later, and it was no better than the G5RV > "T". As a matter of fact I just phased the 100ft tower against the G5RV to > make a two element 160 vertical array with four patterns. > > > >> Again my question: How much better is a "T" over an "L" on 160? > > > > No one would notice, it is not even worth one dB. We are actually lucky > to notice 6 dB unless we A B test something. > > > > You would likely notice the out and up and out half wave, though. It is > far more like a messed up dipole than a good vertical. The one I tried > lost several dB on groundwave over a base loaded vertical. It kept getting > better and better as I made it more and more like an "inverted L". > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
