Be Careful ...
During the conversion of analog to digital TV, there were millions of A to
D TV Converter Box's sold to home owners .... the transition channel in
getting the output of the converter box into a analog TV was either channel
3 or 4 ...... local guys that pulled their Low Pass filters soon found they
had to put them back ....
The biggest example was the ham that lived in a single building multi
apartment complex that offered tenants either a feed off the MATV antenna or
local you pay for it cable...The retired folks who could care less about
cable chose the antenna and a converter box that the government gave them
free.....Yep..wavy lines on channel 3....
-Bill ....KC4PE
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Steve London
Sent: Tuesday, April 17, 2012 9:42 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Low Pass Filters: Are They Of Any Use Today ?
On 4/16/2012 12:20 PM, Jim Brown, K9YC wrote:
> Given that the vast majority of TV's are on Satellite or Cable, is their
> anything to gain by sticking a Low Pass Filter in the Transmission Line ?
> Put very simply, NO. And even if a TV is on an outdoor antenna, it's
> hard to find a good reason for an LPF. Since the final shutdown of
> analog TV several years ago, nearly all broadcasters have abandoned TV
> channels 2-6, so 174 MHz is the lowest frequency still in use in 95% of
> North America, and the majority of TV broadcasters are on UHF.
As a first-order approximation, Jim is correct.
However, the low-band VHF channels have not been totally abandoned. There
are
even new applications for use of these channels. W9WI's web site has a
wealth of
information on USA and Canadian TV channel allocations (www.w9wi.com).
73,
Steve, N2IC
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