Anthony Rumble wrote:
>
> Im looking at putting in a Microwave link between my office
> (In Five Dock) and home (Croydon.. next suburb).. it's not far.. barly 2
> kms..
>
> Any ideas where one could get a topographical map? So I can work out how
> high I would need to make a mast to get line of sight?
>
> I have no idea about this kind of thing..
My advice is to skip the idea and consider;
a)PAPL - the security tie line stuff
b)dual cable to the same provider and VPN.
c)ISDN dial up for the big transfers with modem perm link as normal.
Maps: http://www.lic.gov.au should (i say should) have a list of major
map retailers. I had a look at the Sydney 1:100K map, but that area is
mostly a sea of red and it is hard to see the contour lines. Five Dock
is about 20metres height and Concord looks to be about 40 metres (very
unsure on this one - i guessing a random 50 was a spot height)
You may pick up a 1:25K series at a local newsagent, if they carry it
for some reason.
Most probably you will want the orthophotographic 1:4K series which
will probably only be available from Bridge St(?) in the city (they
plan print on request).
Stand on the roof of one of the buildings in question and with a pair
of binoculars, see if you can see the other. If you can, then it might
be a goer. Microwave links are great if you have clear line of site.
If you have to put up towers, you run into some BIG problems.
Council permission - will council allow you to do it in that
area/site. My local council, in their wisdom, will not allow a 2m TV
sat dish here, only the little dinner plate MDS TV size. Goodness
knows what they think of the 'enormous' bbq grids that I think AT&T
are suddenly popping up. Most hams here have enormous trouble with
council and just do it ("it has always been there {:-).
Tower design - these have to be designed to withstand very high winds
and are either very robust or require large areas of land for bracing
wires.
--
Terry Collins {:-)}}} Ph(02) 4627 2186 Fax(02) 4628 7861
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