low power tv
Tom Poe
tompoe at fngi.net
Tue Apr 22 04:00:53 UTC 2008
Tim wrote:
> On Fri, 2008-04-18 at 11:58 -0700, Les wrote:
>
>> My one point here is that RF is not a "Black art".
>>
>
> If you want to talk about theoretical performance, sure. But when you
> put up a transmission aerial, then find you have areas with no
> reception, severe ghosting, etc., and no solution, it becomes one.
>
> A point in case: A friend of mine, years ago, had the wierdest of
> variable TV reception problems that changed throughout the day. It was
> eventually tracked down to the milk depot some way away. When they
> parked all their big metal trucks back in the depot, it caused massive
> reflections. When they were all out delivering in the morning, things
> were fine. And there were other strange issues when some of them were
> there as they went back and forth during the day.
>
> Here, we have rotten AM radio reception. There's a terrible hum all
> over the band. It only went away when the district power failed. My
> guess is the nearby high tension power lines are radiating the crap that
> disrupts it. You can even hear them audibly, if you go near them. And
> they sizzle evilly in wet or damp weather. ;-)
>
> There's much more to it than putting up a transmission antenna and
> reception antennas with good cabling.
>
Luckily, digital switch next February will curtail those issues.
Tom
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