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

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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