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28.4 Mhz of course!
John "John Smith" wrote in message ... I am going out today and see if I can't fit this all on a boom six foot long or less, drop that 1/4 wave phase reversal line, replace it with a 1:1 phase reversal balun and see just how close I can jam two phase reversed driven elements together... I need a tan anyway... grin Regards, John "Cecil Moore" wrote in message ... John Smith wrote: What would happen if you isolated that second driven element from the boom (the one you are effecting the phase-shift in, and added another reflector ( naturally it is in proper phase) behind it? Could you get the best of two worlds? The advantage of the phase-shift plus a FB ratio? You can get all the FB you want using two driven elements and Roy's simpfeed software. -- 73, Cecil, W5DXP ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
On Mon, 18 Apr 2005 14:05:02 -0700, Roy Lewallen
wrote: You must have missed the announcement I posted not long ago. The article about transmission line phasing systems ("The Simplest Phased Array Feed System - That Works") is now available at http://eznec.com/Amateur/Articles/. And there's also a new Windows Simpfeed program which takes EZNEC (or other modeling program) reported feedpoint impedances as its input (no mutual Z calculation necessary) and calculates the feedline lengths necessary for proper phasing. Click the Simpfeed link at that same URL to get it. It's considerably more versatile than the older DOS programs. A short manual, including a detailed example (using both the EZNEC demo and the standard EZNEC program type), can be viewed by clicking the Help button in the program window. EZNEC example files CardTL.EZ and 4SqTL.EZ illustrate the results of using this feed method. The new program does all calculations in double precision, so you'll find the values it generates are slightly different than the values in the example files -- they're actually better. Nice job! |
Indeed I do sell modeling programs. But it's not necessary to buy one to
answer your question. The EZNEC demo or any of several other free programs including NEC-2 is adequate. Roy Lewallen, W7EL John Smith wrote: LOL!!! Hmm, I wonder if anyone sells one? grin Warmest regards, John "Roy Lewallen" wrote in message ... John Smith wrote: What would happen if you isolated that second driven element from the boom (the one you are effecting the phase-shift in, and added another reflector ( naturally it is in proper phase) behind it? Could you get the best of two worlds? The advantage of the phase-shift plus a FB ratio? That's just the sort of thing antenna modeling programs are for. And they're good at it. Roy Lewallen, W7EL |
Roy, I am just joking with ya! Don't let the "angry tone" of some mislead
ya.... Warmest regards, John "Roy Lewallen" wrote in message ... Indeed I do sell modeling programs. But it's not necessary to buy one to answer your question. The EZNEC demo or any of several other free programs including NEC-2 is adequate. Roy Lewallen, W7EL John Smith wrote: LOL!!! Hmm, I wonder if anyone sells one? grin Warmest regards, John "Roy Lewallen" wrote in message ... John Smith wrote: What would happen if you isolated that second driven element from the boom (the one you are effecting the phase-shift in, and added another reflector ( naturally it is in proper phase) behind it? Could you get the best of two worlds? The advantage of the phase-shift plus a FB ratio? That's just the sort of thing antenna modeling programs are for. And they're good at it. Roy Lewallen, W7EL |
I spend much time designing, flow charting, pseudo-coding, and running
compilers and linkers... I am a "hard head" here... wanna get my hands dirty... as Reg said, "... get some wire in the air..." Regards, John "Roy Lewallen" wrote in message ... Indeed I do sell modeling programs. But it's not necessary to buy one to answer your question. The EZNEC demo or any of several other free programs including NEC-2 is adequate. Roy Lewallen, W7EL John Smith wrote: LOL!!! Hmm, I wonder if anyone sells one? grin Warmest regards, John "Roy Lewallen" wrote in message ... John Smith wrote: What would happen if you isolated that second driven element from the boom (the one you are effecting the phase-shift in, and added another reflector ( naturally it is in proper phase) behind it? Could you get the best of two worlds? The advantage of the phase-shift plus a FB ratio? That's just the sort of thing antenna modeling programs are for. And they're good at it. Roy Lewallen, W7EL |
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