[FADCA] TLH VHF Site Coordinates
[email protected]
[email protected]
Tue, 30 Apr 2002 22:07:38 -0700 (PDT)
Chuck, the link will have to be on uhf.
The lat and log Doug provided as well as the height above
ground will give you his end.
Here are my two sites with antenna elevations for a start:
Live Oak: 30 deg 10 min 00 sec N
83 deg 00 min 00 sec W
Antenna height above ground 450'
Highland 30 deg 06 min 35 sec N
82 deg 03 min 24 sec W
Ant height above ground 460'
Can you calculate at the 400' level on the Tallahassee Site
as well as the antenna height Doug gave. I can tell from the
data that the 176' height will not work for a link to the
site in Live Oak.
It is doubtful that even the 400' antenna height will work,
but it will give us a place to start.
Russ
On Tue, 30 April 2002, Chuck Hast wrote
>
> Comments below...
>
> On Tuesday 30 April 2002 14:53 L, you wrote:
> > At 09:57 AM 4/30/02 -0400, you wrote:
> > >OK, have one end of the path, now need the other end.
> > >More comments below...
> > >
> > >> -----Original Message-----
> > >> From: Doug Ferrell [mailto:[email protected]]
> > >> Sent: Tuesday, April 30, 2002 08:19 AM
> > >> To: [email protected]
> > >> Subject: [FADCA] TLH VHF Site Coordinates
> > >>
> > >>
> > >> Morning All:
> > >>
> > >> Lost some of my messages during a HD crash... someone
> > >> (Russ ???) was
> > >> looking for the coordinates for the tallahassee
tower. here Goes:
> > >>
> > >> AGL 173.88 Feet
> > >
> > >Is the where the link antenna will be?
> >
> > Yep this is the elevation at the tower
>
> AGL= Above Ground Level, that is the point above ground
level
> where the antenna is sited on the tower.
> The 173.88 feet is AMSL
>
> >
> > >> 30.29.36
> > >> 084.17.01
> > >
> > >This is good.
> > >
> > >Is the below a separate tower? if not I am kornfused
over the AGL
> > >data...
> > >
> > >> Tower 400 feet
> > >> 42 inch tower face
> > >>
> > >> our antenna (Decibel 308) @ 389 feet
> >
> > Tower is 400 feet tall. Antenna is @ 390 feet.
Antenna Decibel Products
>
^^^^^^^^^^^^^^^^^^^ This is AGL
>
> > DB304 (Exposed Dipole Quasi-Omni Antenna) is 6.1dBd gain
side mounted.
>
>
> OK, this is going to be for the access point, what is
going to be the link, I
> am more interested in that info as the link data is what I
need to calculate
> the path between the two towers. I am assuming that you
are going to
> use either 220 or 440 for your link. Indeed it is not
FADCA standard to
> use the 2m side as a link as that is not a accepted way to
link the site to
> the rest of the network. It can be done so in a pinch but
it sure causes a
> lot of contention as the local users can not hear the
distant switch trying
> to talk to the local one.
>
> We are getting there little by little, as soon as I have
the link data for
> both ends I will draw you all a nice little picture of the
ray path with both
> the planet curvature and the first fresnel zone.
>
> I will fire up my software tomorrow and start a radial
plot (those are much
> faster than the tile plots) of the access point, the
contours will be 19 db
> and 40 db quieting. 19 db is where a bell 202 starts
working pretty well,
> and 40 db gives you a nice fade margin.
>
>
> >
> > {snip}
> >
> > >What I need are the following to calculate the path
between the two sites.
> > >
> > >Tower 1
> > >Lat/Lon (I can get the ground el from the data base if
you do
> > >not have it)
> > >height of antenna AGL
> > >To do link budget you can add the following
> > >Antenna type
> > >Antenna gain
> > >Feed line loss or feed line type and number of feet
between radio
> > >and antenna, along with any cavities/amps or other in
line devices
> > >Also need the number of connector pairs along the path
> >
> > Total length of 1/2 (soon to be 7/8") hard line is 400
feet, 4 connectors
> > (.5dBd loss per) and one pass cavity.
> > 60 watts out to hardline.
>
> What is the loss of that hard line/100ft at the freq you
are going to use?
> Loss/connector sounds good if they are type 'N' if they
are pl-259 it can
> be "not good"
> What is the loss of the cavity?
>
>
>
> --
> Chuck Hast
> KP4DJT
> [email protected]
> To paraphrase my flight instructor;
> "the only dumb question is the one you DID NOT ask
resulting in my
> going out and having to identify your bits and pieces in
the midst of
> torn and twisted metal."
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