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[aprssig] bad PHG, or lots of big towers?

Neville A. Cross nacross at gmail.com
Tue Dec 14 15:50:15 UTC 2004


I found my self confused with he use of PGH... specially with that
thing about altitude and height. I operate a digi that is at a volcano
at 4800 feet (more o less)above see level and the ground around is 220
feet (more o less). If I use the height on the tower that will be 30
feet. The tower actually is 300 feet tall, but I was not sure which
are the advantages of running coax to the top of the tower. With the
antenna literally in the clouds, what difference make 100 feet, beside
all the other antennas are at upper half. (I also has to confess that
I suffer from vertigo, and 30 feet is the limit of my fear. Lacking of
some one else to do install the antenna, I settle for that height.)

I want to remark that I am a little bit confused, and I don't have and
opinion about what will be the correct answer.

I feel unfair to said that the digi operates at 30 feet. Saying so, I
will be telling that the coverage is shorter that in reality is. On
the other hand I understand that will be not the case for a scenario
with lot of mountains with different height. I which case I really
will declare my self unable to produce a value for PGH.

So please, I want to understand better how to calculate an decent
value for the PGH. Sooner or later my digi will get to an IGATE
(probably sooner because I intend to do so) and I want to be online
with all the best practices.

Neville
YN1V

On Tue, 14 Dec 2004 09:23:01 -0600, Jason Winningham <jdw at eng.uah.edu> wrote:
> Looking through the data Bob posted I find 46 digis with advertised
> heights of 5120ft (a mile!) and 140 with heights of 2560 ft.
> 
> Are there 186 towers over half a mile high with digis on them?  Are
> there even 186 towers over half a mile high in the world?
> 
> Or are there a bunch of operators who don't know the difference between
> height and altitude?
> 
> OK, the last one was rhetorical, but the first two were serious: are
> there really that many tall towers around?
> 
> -Jason
> kg4wsv
> 
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