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(no email)
Date: Thu Dec 16 2004 - 21:12:10 EST
Reading this subject line once again, I have a question for the list.
I think it was Jeff Siegel who first posted the suggestion of using the
Orinoco card with external antenna. I understand that this card plugs into
the computer.
For my use, I would expect to mount the antenna reasonably high on the radar
arch, and use the computer in the pilot house. Thus, cable length from the
antenna to the computer would be at least 15 feet.
802.11 b/g (the technical name for WiFi) operates at 2.5 Ghz. Looking up
cable loss, for 15 feet at 2.5 GHz, I found the following:
RG-58 (small) co-ax cable has a loss of 40 dB per 100 feet, thus 6 dB for 15
feet.
RG-8 (larger) co-ax is listed at 15.5 dB per 100 feet, 2.3 dB for 15 feet
RG-214 (larger, better quality) is listed at 14.8 dB per 100 feet, 2.1 dB
for 15 feet.
Hate to loose that much signal between the antenna and the receiver. Lower
loss cable is available, but it gets big, expensive, and difficult to work
with.
If an external WiFi transceiver is used, with USB to connect to the
computer, the transceiver could be located at the base of the antenna,
effectively eliminating this loss. Standard USB interface (if I remember
correctly) is rated for 5 meters (15 plus feet), extension amplifiers are
readily available.
Has anyone considered this solution?
Thanks,
Chet
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