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Log-Periodic Antenna Design

by Rich Grise <rich@[EMAIL PROTECTED] > Nov 19, 2008 at 10:45 PM

My current UHF antenna is a 14" Radio Shack clip lead clipped from the 
center of my coax to the venetian blind. I have to hand-adjust it
for the channel, weather conditions, phase of the moon, etc. I can
do this because I can _see_ an indication of signal strength.

Well, with this new Fascist "No More Free TV" crap, I'm gonna need
a real UHF antenna. My budget is exceedingly limited, but I have
a supply of materials (GTAW filler rod, with some coppery-colored
coating, so it solders like a dream, and is as stiff as piano wire)
to build an antenna with.

But I've been searching the web for some weeks now, and I can't
seem to find any kind of formula, except there was this program
I downloaded - LPDA.EXE, which runs on DOS. Unfortunately, it's
in Russian or Polish or Uzbekistani - one of those East Yurp
languages. Here's a screen snap:
http://mysite.verizon.net/richgrise/images/LP-Prog-Output.gif

Which I went through pretty much by-guess-and-by-gosh - can
anybody read that stuff?

There are a lot of factors I don't know about, like "Tau", and
all of the specific designs on the web are flat - something is
telling me I want one of those pyramid-shaped ones, but I really
don't know the difference (between that and flat) - it's probably
something to do with bandwidth or F/B ratio or whatever.

My local library has no ARRL Antenna Book (!), and did I mention
I have a seriously limited budget?

So, how do I pursue this? It'd be nice to have a program that will
calculate the whole thing for me, but am I dreaming? If I want to 
send myself to Log-Periodic School, where should I start? 

Or, does anyone have a UHF-TV log-periodic design that they'd share? :-)

Thanks,
Rich
 




 131 Posts in Topic:
Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-19 22:45:19 
Re: Log-Periodic Antenna Design
"David L. Jones"  2008-11-19 15:26:20 
Re: Log-Periodic Antenna Design
"David G. Nagel"  2008-11-19 17:52:01 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 01:03:01 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-20 06:26:39 
Re: Log-Periodic Antenna Design
"David L. Jones"  2008-11-19 17:17:49 
Re: Log-Periodic Antenna Design
"Carl Ijames" &  2008-11-19 23:50:19 
Re: Log-Periodic Antenna Design
John Larkin <jjlarkin@  2008-11-19 16:03:02 
Re: Log-Periodic Antenna Design
dplatt@[EMAIL PROTECTED]   2008-11-19 15:20:13 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 00:59:57 
Re: Log-Periodic Antenna Design
"Tam" <t-tam  2008-11-19 18:14:27 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 00:55:58 
Re: Log-Periodic Antenna Design
dplatt@[EMAIL PROTECTED]   2008-11-19 17:16:34 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-20 06:18:05 
Re: Log-Periodic Antenna Design
"David L. Jones"  2008-11-19 17:23:15 
Re: Log-Periodic Antenna Design
mpm <mpmillard@[EMAIL   2008-11-19 18:13:13 
Re: Log-Periodic Antenna Design
mpm <mpmillard@[EMAIL   2008-11-19 18:22:06 
Re: Log-Periodic Antenna Design
"TheM" <Dont  2008-11-20 01:53:33 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 20:19:15 
Re: Log-Periodic Antenna Design
Jim Lux <james.p.lux@[  2008-11-19 16:49:03 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 20:17:22 
Re: Log-Periodic Antenna Design
"Joel Koltner"   2008-11-20 13:59:52 
Re: Log-Periodic Antenna Design
"NoSPAM" <un  2008-11-20 19:16:37 
Re: Log-Periodic Antenna Design
"Joel Koltner"   2008-11-20 16:27:08 
Re: Log-Periodic Antenna Design
"NoSPAM" <un  2008-11-20 19:38:03 
Re: Log-Periodic Antenna Design
"christofire" &  2008-11-21 16:26:27 
Re: Log-Periodic Antenna Design
Richard Clark <kb7qhc@  2008-11-21 10:42:58 
Re: Log-Periodic Antenna Design
Roy Lewallen <w7el@[EM  2008-11-21 18:35:17 
Re: Log-Periodic Antenna Design
"christofire" &  2008-11-20 01:10:42 
Re: Log-Periodic Antenna Design
Jim Lux <james.p.lux@[  2008-11-20 13:27:49 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-20 17:07:57 
Re: Log-Periodic Antenna Design
John Smith <assemblywi  2008-11-19 18:31:05 
Re: Log-Periodic Antenna Design
"Ken S. Tucker"  2008-11-19 19:30:59 
Re: Log-Periodic Antenna Design
John Smith <assemblywi  2008-11-19 22:05:19 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-20 06:36:37 
Re: Log-Periodic Antenna Design
John Smith <assemblywi  2008-11-20 09:31:48 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 20:24:14 
Re: Log-Periodic Antenna Design
John Smith <assemblywi  2008-11-20 15:09:26 
Re: Log-Periodic Antenna Design
"JB" <nospam  2008-11-20 03:04:27 
Re: Log-Periodic Antenna Design
Richard Clark <kb7qhc@  2008-11-19 22:53:28 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 20:31:47 
Re: Log-Periodic Antenna Design
Roy Lewallen <w7el@[EM  2008-11-20 15:35:53 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-21 00:49:27 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-21 06:18:37 
Re: Log-Periodic Antenna Design
John Smith <assemblywi  2008-11-21 07:02:56 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 20:41:44 
Re: Log-Periodic Antenna Design
Helmut Wabnig <hwabnig  2008-11-20 09:53:28 
Re: Log-Periodic Antenna Design
"Michael A. Terrell&  2008-11-29 17:38:37 
Re: Log-Periodic Antenna Design
Dave <dave@[EMAIL PROT  2008-11-20 13:50:57 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 20:51:58 
Re: Log-Periodic Antenna Design
Dave <dave@[EMAIL PROT  2008-11-21 14:22:37 
Re: Log-Periodic Antenna Design
zekfrivo@[EMAIL PROTECTED  2008-11-20 14:16:54 
Re: Log-Periodic Antenna Design
zekfrivo@[EMAIL PROTECTED  2008-11-20 14:18:47 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-20 20:59:15 
Re: Log-Periodic Antenna Design
Roy Lewallen <w7el@[EM  2008-11-20 15:30:26 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-21 00:51:28 
Re: Log-Periodic Antenna Design
Roy Lewallen <w7el@[EM  2008-11-20 16:58:46 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-21 06:28:40 
Re: Log-Periodic Antenna Design
"JB" <nospam  2008-11-21 17:14:12 
Re: Log-Periodic Antenna Design
"Sal M. Onella"  2008-11-21 21:25:56 
Re: Log-Periodic Antenna Design
Jim Lux <james.p.lux@[  2008-11-24 10:57:46 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-24 14:02:10 
Re: Log-Periodic Antenna Design
Jim Lux <james.p.lux@[  2008-11-24 12:56:27 
Re: Log-Periodic Antenna Design
Richard Clark <kb7qhc@  2008-11-24 13:02:46 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-24 17:10:00 
Re: Log-Periodic Antenna Design
Richard Clark <kb7qhc@  2008-11-24 15:48:00 
Re: Log-Periodic Antenna Design
Roy Lewallen <w7el@[EM  2008-11-24 16:13:05 
Re: Log-Periodic Antenna Design
zekfrivo@[EMAIL PROTECTED  2008-11-21 15:19:00 
Re: Log-Periodic Antenna Design
"JB" <nospam  2008-11-21 17:39:22 
Re: Log-Periodic Antenna Design
dplatt@[EMAIL PROTECTED]   2008-11-21 11:27:11 
Re: Log-Periodic Antenna Design
zekfrivo@[EMAIL PROTECTED  2008-11-21 20:14:56 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-21 23:53:15 
Re: Log-Periodic Antenna Design
Richard Clark <kb7qhc@  2008-11-20 18:43:07 
Re: Log-Periodic Antenna Design
Art Unwin <ArthurUnwin  2008-11-21 16:04:33 
Re: Log-Periodic Antenna Design
John Smith <assemblywi  2008-11-21 21:08:28 
Re: Log-Periodic Antenna Design
mpm <mpmillard@[EMAIL   2008-11-21 18:49:55 
Re: Log-Periodic Antenna Design
JIMMIE <JIMMIEDEE123@[  2008-11-24 13:54:16 
Re: Log-Periodic Antenna Design
chrisgj198@[EMAIL PROTECT  2008-11-20 10:56:45 
Re: Log-Periodic Antenna Design
"Ralph Mowery"   2008-11-20 19:04:34 
Re: Log-Periodic Antenna Design
"Sal M. Onella"  2008-11-20 21:59:02 
Re: Log-Periodic Antenna Design
Cecil Moore <nospam@[E  2008-11-21 06:36:32 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-22 00:04:57 
Re: Log-Periodic Antenna Design
Dave <dave@[EMAIL PROT  2008-11-22 12:48:05 
Re: Log-Periodic Antenna Design
mpm <mpmillard@[EMAIL   2008-11-21 06:43:44 
Re: Log-Periodic Antenna Design
"Joel Koltner"   2008-11-21 10:27:03 
Re: FCC TV Band Devices
Dave <dave@[EMAIL PROT  2008-11-22 12:45:17 
Re: FCC TV Band Devices
"Joel Koltner"   2008-11-25 11:53:25 
Re: FCC TV Band Devices
Dave <dave@[EMAIL PROT  2008-11-26 13:57:29 
Re: FCC TV Band Devices
"Joel Koltner"   2008-11-26 09:54:10 
Re: FCC TV Band Devices
Dave <dave@[EMAIL PROT  2008-11-27 00:16:39 
Re: Log-Periodic Antenna Design
mpm <mpmillard@[EMAIL   2008-11-21 19:01:22 
Re: Log-Periodic Antenna Design
ml <m@[EMAIL PROTECTED  2008-11-25 05:23:33 
Re: No More Free TV (was Log-Periodic Antenna Design)
Dave <dave@[EMAIL PROT  2008-11-25 13:51:24 
Re: No More Free TV (was Log-Periodic Antenna Design)
"CW" <cmager  2008-11-25 07:26:28 
Re: No More Free TV (was Log-Periodic Antenna Design)
Richard The Dreaded Liber  2008-11-25 18:47:34 
Re: No More Free TV (was Log-Periodic Antenna Design)
Dave <dave@[EMAIL PROT  2008-11-26 13:48:27 
Re: No More Free TV (was Log-Periodic Antenna Design)
"Sal M. Onella"  2008-11-26 21:38:17 
Re: No More Free TV (was Log-Periodic Antenna Design)
"Dave" <noon  2008-11-27 14:52:34 
Re: No More Free TV (was Log-Periodic Antenna Design)
"Wayne" <myg  2008-11-27 09:05:48 
Re: No More Free TV (was Log-Periodic Antenna Design)
John Smith <assemblywi  2008-11-27 11:55:14 
Re: No More Free TV (was Log-Periodic Antenna Design)
T <kd1s.nospam@[EMAIL   2008-11-27 22:37:58 
Re: No More Free TV (was Log-Periodic Antenna Design)
"JB" <nospam  2008-11-28 15:43:59 
Re: No More Free TV (was Log-Periodic Antenna Design)
John Smith <assemblywi  2008-11-28 12:05:18 
Re: No More Free TV (was Log-Periodic Antenna Design)
T <kd1s.nospam@[EMAIL   2008-11-27 22:36:14 
Re: No More Free TV (was Log-Periodic Antenna Design)
JosephKK <quiettechblu  2008-11-30 15:22:10 
Re: No More Free TV (was Log-Periodic Antenna Design)
Richard Clark <kb7qhc@  2008-11-25 10:17:44 
Re: No More Free TV (was Log-Periodic Antenna Design)
Richard The Dreaded Liber  2008-11-25 18:49:26 
Re: No More Free TV (was Log-Periodic Antenna Design)
jimp@[EMAIL PROTECTED]   2008-11-25 19:35:00 
Re: No More Free TV (was Log-Periodic Antenna Design)
Cecil Moore <nospam@[E  2008-11-25 13:42:39 
Re: No More Free TV (was Log-Periodic Antenna Design)
jimp@[EMAIL PROTECTED]   2008-11-25 20:15:01 
Re: No More Free TV (was Log-Periodic Antenna Design)
Rich Grise <rich@[EMAI  2008-11-25 22:23:00 
Re: No More Free TV (was Log-Periodic Antenna Design)
jimp@[EMAIL PROTECTED]   2008-11-25 23:15:01 
Re: No More Free TV (was Log-Periodic Antenna Design)
"CW" <cmager  2008-11-25 12:06:45 
Re: No More Free TV (was Log-Periodic Antenna Design)
Rich Grise <rich@[EMAI  2008-11-25 22:24:40 
Re: No More Free TV (was Log-Periodic Antenna Design)
Richard Clark <kb7qhc@  2008-11-25 15:06:48 
Re: No More Free TV (was Log-Periodic Antenna Design)
Eeyore <rabbitsfriends  2008-11-25 23:22:52 
Re: Log-Periodic Antenna Design
Richard The Dreaded Liber  2008-11-25 18:46:40 
Re: Log-Periodic Antenna Design
jimp@[EMAIL PROTECTED]   2008-11-25 19:35:01 
Re: Log-Periodic Antenna Design
dplatt@[EMAIL PROTECTED]   2008-11-25 11:27:41 
Re: Log-Periodic Antenna Design
JeffM <jeffm_@[EMAIL P  2008-11-25 17:12:06 
Re: Log-Periodic Antenna Design
"Sal M. Onella"  2008-11-25 21:52:43 
Re: Log-Periodic Antenna Design
mzenier@[EMAIL PROTECTED]  2008-11-20 20:56:44 
Re: Log-Periodic Antenna Design
"Chuck Olson" &  2008-11-24 16:07:35 
Re: Log-Periodic Antenna Design
"Chuck Olson" &  2008-11-24 16:22:14 
Re: Log-Periodic Antenna Design
"Chuck Olson" &  2008-11-25 00:24:45 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-11-25 18:55:30 
Re: Log-Periodic Antenna Design
"Chuck Olson" &  2008-11-25 12:22:41 
Re: Log-Periodic Antenna Design
"Chuck Olson" &  2008-12-05 19:32:03 
Re: Log-Periodic Antenna Design
Rich Grise <rich@[EMAI  2008-12-08 19:10:24 
Re: Log-Periodic Antenna Design
T <kd1s.nospam@[EMAIL   2008-12-11 14:12:34 
Re: Log-Periodic Antenna Design
LIBERATOR <nogeekluv@[  2008-11-27 00:22:35 

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