[TowerTalk] Two 15M stacking
TexasRF at aol.com
TexasRF at aol.com
Sun Feb 25 09:29:43 EST 2007
One added thought that will help reconcile K1TTT's experience with others on
>From K1TTT into Europe, say a 3500 mile path, a 54 degree angle will have a
3dB coverage of about 3200 miles in width. From this part of the world, that
path would be about 1500 miles longer, encompassing about 4500 miles in
Yes, I can see that more antenna movement will be needed from New England
for the same signal strength. Finally a factor that favors "the rest of us"!
maybe In a message dated 2/24/2007 10:46:15 P.M. Central Standard Time,
k5go at cox.net writes:
Check the results in my link above
versus other MMs using much larger systems...I don't
think you will find their much larger antennas
make a significant difference.
Obviously you have a good antenna system on 10M but (the real compliment
follows, Bill) in my opinion the VAST majority of the reason for your results or
anyone else's results is the operating ability as opposed to the
effectiveness of their antenna system.
You originally said:
My 6 element KLM array has a 3 dB beamwidth of about 54 degrees, which is
plenty for Europe.
There was dispute from K1TTT, I think, who said that more than 4 or 5
elements was too narrow from the East Coast for Europe. My example was to add food
for thought regarding a higher gain antenna and just how many degrees off
you have to be to have a weaker signal than with the original antenna.
In my example I said suppose you doubled the boomlength and achieved another
3 dB which would narrow the beamwidth. Doesn't matter it's a little 4
element 15M Yagi on a 24 foot boom or what. My point was, that in order to
compare two antennas to know whether you could possibly lose anything because of
the narrow beamwidth, you would have to look at the 3 dB beamwidth of the one
with X gain and then compare it to the 6 dB beamwidth of one with X + 3 dB of
gain. I have seen some compare the - 3 dB points and say, for example, that
because the 3 dB beamwidth narrowed by 20 degrees that it is too narrow not
realizing that they would still be nearly as strong at the original beamwidth
with the additional gain of the larger antenna.
I'll still take all the gain I can get pointed at DL.
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