Pointer: Using wireless modem over coaxial cable link
A recent thread in the Usenet news group 'comp.os.linux.networking' titled "USing wireless modem over cable" has some interesting thoughts about the idea of using a pair of wireless access points and a considerable length of coaxial cable.
Briefly, a reported one mile (1.6 km) of 75 Ohm Heliax (exact part number not known - reported size 1.125 inch which I don't see in my catalog). The original poster never stated if this was pole mounted or buried. The measured loss of the cable was reported at 75 dB. Given a +20 dBm output, this should provide -55 dBm at the receiving end. There is no atmospheric concerns, and no problems with Fresnel zone clearance, trees, interference, or obstructions to line-of-sight. The resulting signal strength should be more than adequate for a wide band link, even though 75 Ohm is the wrong impedance (50 Ohm is the "correct" value).
Problem: This cable is _extremely_ expensive when talking about these distances. There may also be substantial problems in being able to place the cable (right-of-way issues). Really, really, really, there MUST be better solutions than this.
Problem: The cable may act as a ground loop, and raise serious questions of danger from lightning strikes and other electrical problems. Consult your insurance carrier, and local jurisdictional building codes or similar for your area. This could result in cancellation of your insurance, as well as civil or criminal penalties. You have been warned!
Bottom line: The original poster posted an article early today, with but four words of text:
Holy Moly it works.
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Old guy
read more and respond »Posted 5 years ago by Moe Trin in Wireless Networking
