RadioBanter - View Single Post

July 13th 03, 08:38 PM

(Richard Harrison) wrote:
Floyd Davidson wrote:
"---I`ll bet you just exagerated a little, that`s all."

Too many hours of daylight on Floyd are taking their toll.

Look like you need some daylight.

Everything you work with is known. precisely, including path attenuation
under normal propagation conditions. Normally, you don`t have a path
grazing at a highly reflective point. Your path survey discloses path
detractions and you adjust for the possibility of distructive
interference. You may opt for a high / low antenna placement for the
path ends, diversity, more clearance, shorter paths, and brute-force
fade margins. The high / low option lets you move the reflection point
and the reflection. Long microwave systems must have huge fade margins
anyway due to noise buildup from individual path contributions. A
receiver not too much below the overload signal point is a very quiet
receiver and contributes almost no noise to a system.

When the path design is right, the as-built numbers are almost exactly
as calculated, whether you believe it or not.

Lets see, now you are saying that you go out and *measure* the
path, rather than calculate it.

And of course you measure it, *every* *single* *time*, on a day
when you *know* whether it is giving you the best path, the
worst path, or some specific point in between.

Richard you can cut the bull**** out. I've been measuring
microwave paths for 40 years. You don't calculate them to
within 1 dB. You might find out what that is after measuring it
on a regular basis for a year. (I've done *continous* path
measurements of several paths for over a year, and on two for
10 years.)

--
Floyd L. Davidson http://web.newsguy.com/floyd_davidson
Ukpeagvik (Barrow, Alaska)