"Panel" style UHF DTV antenna?

On Jun 13, 10:10*am, Richard Clark wrote:
On Sat, 13 Jun 2009 01:08:24 -0700 (PDT),
wrote:
Oh well, some more cable along with a UHF/
VHF splitter (combiner) and that big Winegard in the garage will
hopefully cure it.

By this little snippet of what was intended as an aside may, in
fact,
be your solution for VHF. *Given your predicament of
"code" (arbitrary
or otherwise), you can put the cable to work.

The solution is called a "Franklin Antenna." *It would be disguised
as
an antenna cable (or telephone cable, or power line, or other
innocuous wire) that trails up (to something innocuous), but never
connects (who is going to look? *and if they did, it could always
be a
dummy connection).

A Franklin antenna is a stacked, gain antenna that is very colinear
(hence the cable motif). *These are most often described on the Web
for home wi-fi or bluetooth applications, but with scaling you can
bring them back down into the TV VHF band. *A quick search
gives:http://www.para.org.ph/membersarticl...velopment%20of
%20Coll...
which on page 11 gives a pictorial representation (I can't say I
vouch
for the entire paper, but it is representative of the topic).

73's
Richard Clark, KB7QHC

I hung the spectrum analyzer on the Winegard all channel antenna in
the rafters of the garage. The VHF channels are strong and free of
response 'bumps' (meaning no serious multipath) and the UHF may be
better than the squareshooter on the roof. Tomorrow I shoot a hole in
the stucco wall to get the new RG-6 coax (crazy guy at Torrance
Electronics sold me 100 ft for $9) pulled in to the splitter to feed
the computers and STB. It looks like it will be good.

G²

On Jun 9, 11:21*pm, "amdx" wrote:
A mismatch can cause ghosting in an analog TV.
What does ghosting do to a digital TV signal?

* Just as a point of interest (to me at least) I grew up within 3 blocks of
an airport, it
was a several times a day occurance to have the picture flutter as an
airplane flew by.
* * * * * * * * * * * * * * * * * * * * * * * * *Mike

It was identifying the reflection of radio signals from a flying
aircraft that led to the development and use of radar.
Radar was major factor in the successful defence of Britain (Britain
1940) against German bombing (The Blitz) early in WWII (1939-1945).
Although it was initially very crude, (It was called Radio-location or
RDF, Radio Direction Finding) at the time.
Unfortunately the first war time US use of radar was misinterpreted
when the Japanese attacked Pearl Harbour in Dec 1941!

stan wrote:

It was identifying the reflection of radio signals from a flying
aircraft that led to the development and use of radar.
Radar was major factor in the successful defence of Britain (Britain
1940) against German bombing (The Blitz) early in WWII (1939-1945).
Although it was initially very crude, (It was called Radio-location or
RDF, Radio Direction Finding) at the time.
Unfortunately the first war time US use of radar was misinterpreted
when the Japanese attacked Pearl Harbour in Dec 1941!

Actually it was blocking of a radio transmission by ships passing on a
river that led to the development of radar.

tom
K0TAR

On Mon, 15 Jun 2009 20:32:40 -0500, tom wrote:
stan wrote:

It was identifying the reflection of radio signals from a flying
aircraft that led to the development and use of radar.
Radar was major factor in the successful defence of Britain (Britain
1940) against German bombing (The Blitz) early in WWII (1939-1945).
Although it was initially very crude, (It was called Radio-location or
RDF, Radio Direction Finding) at the time.
Unfortunately the first war time US use of radar was misinterpreted
when the Japanese attacked Pearl Harbour in Dec 1941!

Actually it was blocking of a radio transmission by ships passing on a
river that led to the development of radar.

The Potomac -- I think that's what I read about it.

Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
38.24N 104.55W | @ config.com | Jonesy | OS/2
* Killfiling google & XXXXbanter.com: jonz.net/ng.htm

On Mon, 15 Jun 2009 20:32:40 -0500, tom wrote:

stan wrote:

It was identifying the reflection of radio signals from a flying
aircraft that led to the development and use of radar.
Radar was major factor in the successful defence of Britain (Britain
1940) against German bombing (The Blitz) early in WWII (1939-1945).
Although it was initially very crude, (It was called Radio-location or
RDF, Radio Direction Finding) at the time.
Unfortunately the first war time US use of radar was misinterpreted
when the Japanese attacked Pearl Harbour in Dec 1941!

Actually it was blocking of a radio transmission by ships passing on a
river that led to the development of radar.

tom
K0TAR

RF blocking was used by both sides as a "burglar alarm" to detect
naval vessels passing through narrow straights. Germany tried to get
such a system working across the Straits of Gibraltar, but were foiled
by Spain's failure to cooperate.

Radar was officially "invented" in 1935 when Watson-Watt was asked by
the air ministry to calculate the possibility of using RF as a "death
ray" to cook an airplane pilot in flight. Some calculations were
performed which quickly determined that it was impossible. However,
he suggested that a similar system could be used to detect the
airplane by combining the range finding of ionospheric layers
techniques and the direction finding techniques used to detect
thunderstorms. At the time, there were also proposals for aircraft
detection using infrared and sound detection. Not wanting to lose
their funding, it was agreed that RF reflection was a good idea and
that research should continue on this different path.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558