Topband: Antennas

[Larry Molitor]

At 08:43 AM 8/27/01 -0400, Tom Rauch wrote:
>Unless we A-B an antenna time and time again against a known
>and stable reference and average the results, small or even modest
>  changes are lost in the data clutter.


Very true. That's why I always base my conclusions on observations made 
over a span of years. Log entries are a fair filter of "measurement noise" 
and, after all, isn't the "best" antenna the one that make the operator the 
happiest?


>A 70 foot vertical with four 45deg hat wires is equal to a 99ft vertical
>for loop radiation resistance. A 60 foot vertical with four flat hat
>wires is equal to the same.



Please repeat, if you can, your analysis using a 50 foot vertical section 
and compare a two wire "flat top" to two drooping wires with the ends 10 
feet off the ground. I would very much like to see if your results come out 
close to mine.



>Using the hat wires for guying certainly isn't a big problem,



It is a very big problem if it is not practical to put guys at the top of 
the structure. Remember that my original premise was for portable and 
mobile antennas. Droopy wire "hats" must show a significant advantage to 
justify a very large increase in construction, transportation and 
installation difficulty. On the other hand, if you already have a large 
guyed structure out in the pasture, the choice becomes obvious!


>Anything creates problems if done incorrectly.


Hence the need to pose the questions to the collective wisdom of the list.

Thanks for your input, Tom.

73,

Larry - W7IUV