I never thought of a 3db gain in pecker length. (other than from at rest to attention) Interesting concept.Quote:
Originally Posted by koØm
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I never thought of a 3db gain in pecker length. (other than from at rest to attention) Interesting concept.Quote:
Originally Posted by koØm
Attachment 13748Quote:
Originally Posted by kk4fpx
A gamma match is usually a variable capacitance device; the difference between a 2Kw gamma match and a 10Kw gamma match was the thickness in the dielectric insulator. Build yourself a heavier gamma match with large components.
http://arrowantennas.com/solid/146-4s.html
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Mel and Kelli have great ideas.
True, the doubling of power (from 150 to 300) isn't gonna do much at all. However, he's stuck with the 300 watts output because of the radio. For now. How many feet of RG-58 would it take to attenuate... ;) :lol:
That Arrow antenna has a claimed gain of 9.7dBi. :chin: Even if a bit of a high claim, that's a big help. Typical 10 element Yagi instead would be what, maybe 11-13dBi? Arrow antennas are pretty damn good, so that is decent. all by itself.
Another Arrow Yagi "stacked" with a power divider is "yet another" 3dB, and would split that 300 watts. No more power issues, and gulp, more gain. Of course a phasing harness would split the power and give even more gain if carefully designed.
But hell, the combination of 150 watts and the Arrow should do quite well.
Two of those Arrows with 300 watts would hurt people. Eh?:mrgreen:
Always go for MOAR POWER (gain)!
Attachment 13749
Okay all I'll not try the 300 watts. Thanks for the input.
Quote:
Originally Posted by kk4fpx
A wise choice. Just to give you an idea of what can happen, scientists had a 150 watt tracker on a bald eagle. One of them briefly ran 300 watts, and...........
Attachment 13751
A well designed 10 element yagi can do 10 dBd my 11 element Flexa yagi states 12.4 dBd
9.7 dBi will be 6 dBd.
just put a 50 foot run of RG-58 coax between the radio and the amp. U will lose enough dogbones to lower your power output way way down! 'Course Ur RX will be numb then too! (by about the same DB!)
Seriously, I doubt the antenna would be harmed, if U have some decent coax going to it from the amp. RG-8X will probably warm up though I have run a KILLERWATT through mine. Those antennas are probably way underrated, as they never expected anyone to run high power through them.
I would bet U could run a full 1500W into it and it would work just fine!
Nothing on the antenna is really going to break down. The gamma match or T match is probably same the HIGH power antennas have, it is a pretty standard design. I know the tower mounted antennas are good for 1500W, but the arrow is a hand held antennna. Again no one expected any one to be QRO into a hand held antenna!
After examining that link, I cannot see why it wouldn't handle 300W EASILY! It' not the hand held antenna I was thinking of.
I wouldn't wanna PISS THAT BEE OFF!!Quote:
Originally Posted by K7SGJ
Quote:
Again no one expected any one to be QRO into a hand held antenna!
You can do it once
http://3.bp.blogspot.com/_qj4XaRCP_5...E.+Coyote3.jpg