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Bob Miller wrote:
On Sat, 09 Apr 2005 20:43:41 GMT, Walter Maxwell wrote: On Sat, 09 Apr 2005 10:55:11 -0500, Cecil Moore wrote: H. Adam Stevens, NQ5H wrote: but any increase in the 1.5:1 SWR bandwidth is due to loss as Walt proved decades ago. If you want a really broad-banded Bazooka, use RG-174. :-) Advantages: light weight for easy back-packing, no tuner required, inexpensive coax, ... Hey, maybe I should keep it secret until I market it for $100. Egad, Cecil! It's evident I wasn't too bright years ago when I showed why the bazooka gets its meager increase in BW from resistive loss, not reactance cancellation. My scamming genes hadn't developed to the point where I even thought of marketing it instead of panning it. As you said, Cecil, with the higher loss available using RG-174 vs RG-17, think of how rich we could have become if we'd let the morons continue to believe what a great antenna it is, and sold em with 174. Walt, W2DU There's a Double Bazooka currently on eBay for the "Buy it Now" price of only $60. Part of the sales pitch is: "The Double Bazooka antenna was designed and developed by the M.I.T staff in the 1940's as a radar recieving antenna. Its design was modified for the hf amateur radio bands." There's one born every minute... There is nothing inaccurate in that description as far as I know. Let's be fair about the Double Bazooka: It does exhibit a broader SWR bandwidth than a dipole antenna. I've now used the 160m coaxial inverted "L" described by Ted Cohen N4XX in the January, 2000 issue of CQ Magazine. It has been up for about four years, during which time I've worked just about any exotic DX which has appeared on the bands--even FT5XO. The antenna is simply half a double bazooka and it runs vertically 65 feet and horizontally a little over 62'. The entire 200 KHz of the 160m band is covered with SWR under 2:1. Of course the fact that I have about 6,000 of radials under the thing may help more than a bit. Can I assume that since the antenna is only half a double bazooka that the loss of power in using it would be roughly half of that using a double bazooka dipole? I can often work EU stations with just 100w. I could seldom do that from my Cincinnati QTH in the late seventies and early eighties using a 60' omega matched aluminum tower with TH6DXX as top loading. Dave K8MN Cameron, WV |
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