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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