low power tv

[Tom Poe]

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