G
I am looking for some experiences, either positive or negative, regarding
the use of license-free ISM spread spectrum radio modems. We have a PLC5
and we need to communicate to 6 remote sites, the farthest of which is 1/2
mile away. I thought we could use DF1 protocol to Micrologix controllers at
each location. There are a few houses and trees in the way out to the
farthest remote location, and we do not have 'line of sight'. A local
vendor/integrator, with whom I have no past relationships with, is telling
me to put up 20-30 ft towers for antennas. Does this sound reasonable? It
does not seem right to me, that I can go 25 miles with these if I have 'line
of sight', but I can't go 2500 ft because of a couple single story ranch
houses and trees? Any advice?
Jeffrey Gee
the use of license-free ISM spread spectrum radio modems. We have a PLC5
and we need to communicate to 6 remote sites, the farthest of which is 1/2
mile away. I thought we could use DF1 protocol to Micrologix controllers at
each location. There are a few houses and trees in the way out to the
farthest remote location, and we do not have 'line of sight'. A local
vendor/integrator, with whom I have no past relationships with, is telling
me to put up 20-30 ft towers for antennas. Does this sound reasonable? It
does not seem right to me, that I can go 25 miles with these if I have 'line
of sight', but I can't go 2500 ft because of a couple single story ranch
houses and trees? Any advice?
Jeffrey Gee