On Nov 20, 11:55 am, Rich Grise wrote:
On Wed, 19 Nov 2008 18:14:27 -0500, Tam wrote:
"Rich Grise" wrote in message
news
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/...rog-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? :-)

Before you get too far, be sure you know what you need. This is based on
post 2/09 channel assignments. You will need to cover either a) CH2 - CH51
b)CH7 - CH51
c) CH14 - CH51

This won't do at all! Two of my favorite stations are ch. 56 & ch. 58.
=:-O

I've got 2-13 covered by my external VHF folded dipole. (It's an RV).

Are the channel frequencies going to be all changed around?

Yes.
Channels will vary depending upon your country and location. You
should have some sort of official digital TV website for your country
that lists and explains all this stuff.
Australia for instance is:
http://www.dba.org.au/
(server down?)

Dave.