[NLRS] Is there published data on tree foliage ...

Chris Elmquist chrise at pobox.com
Thu Jul 10 11:53:56 EDT 2014


On Thursday (07/10/2014 at 10:19AM -0500), Donn, WA2VOI wrote:
> 
> No, the report doen't state "condition" of the foliage.  From
> contest, however, I assume it refers to "dry" foliage.  The report
> treats each source of loss seperately: i.e., atmospheric, water
> vapor, rain, scattering, etc.  (The report is aimed at mm wavelength
> propagation.  The foliage loss equation just happens to cover down
> to 200MHz.)

Got it.  Thanks.

> FWIW, I agree with you completely re: rain-covered foliage and TV
> signals.  My "look" at the Shoreview towers is blocked by a hill and
> I suffer badly from multi-path.  Dry conditions are... OK, but
> during and after rain, no so much.

Pretty much the same experience here.  I used to be able to get a shock
off the coax when we had the analog TV transmitters running (well, OK,
not quite but it was a HUGE signal).   Now, I loose lock and go all
pixelated on KSTP and WCCO when it rains.  I am 7.5 mi from Shoreview
with no hills blocking, just trees.  I can see the aircraft beacon lights
on the towers from my roof when the leaves are not out.

> PS The FCC report is readily available on the Internet.  (Where I
> got it originally.)  Don't rememebr exactly, but 'FCC OET Bulletin
> 70' in a search engine should find it.

OK. Thanks Donn.

Chris N0JCF
-- 
Chris Elmquist



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