05-22-2011, 10:33 AM
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Join Date: May 2010
Originally Posted by 76Q
I just read up on this thread, thanks for the continued input plots showing top hats, Marconi. I for one have just compared my originally 80" MM antenna to a modified version that I made and have found no discernable difference in signal in a two mile low power test on TX
vs. full length whip. I did the test at 2 miles with 50 ft
. elevation rise to target receiver. Furthermore, there is simply no difference in the performance to the places I normally talk, about 50miles groundwave over hilly terrain and the skip that I shoot to the U.S. and the Islands. My top hat replaces about 35" of radiator while the massive 5 wrap center coil replaces about 26" of a full quarterwave radiator. This antenna is impossible to tell apart in performance from my 9 ft
whip, and I am
attempting to identify ways to alter its vertical pattern response to more favor the use that I require.
Clearly your models show vertical pattern modification by top hat implementation. There are more factors that need to realized, such as at what size of top hat would be optimal to yield the best vertical pattern, interactions with earth by implementation of various height and form hats, etc. Perhaps a model of the Immortal is an important next step as is modeling my own version of it. 76 Biohazard
SoCal 76, Fast4Socal76 etc etc etc you sure change your name alot of these forums ...