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Spring 2008 Issue |
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HSMM Getting
on the Internet By John Champa, K8OCL
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 The Linksys WMP54G Wire less-G PCI adapter. |
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In our previous column we discussed an HSMM radio
repeater (Wireless Access Point/Router + PC) and the setup of a simple
RAN (Radio Area Network). This time we will look at what is in a basic
HSMM radio station (client). However, first let us look at another
related area.
By combining an HSMM radio repeater with a laptop
having broadband wireless Internet access such as provided by Sprint and
other carriers, it is possible to provide shared Internet access for the
radio stations connected to the RAN. Field experience with such a
configuration indicates several special steps need to be taken for this
configuration to work effectively: 1. Use a broadband card, or ED-VO card with an external antenna port. 2. Mount the broadband Internet access external antenna on the roof of your vehicle as far away from your HSMM radio antenna(s) as possible to avoid desensing. 3. Use two external antennas, if possible, on your HSMM repeater in order to achieve receive space diversity. 4. Mount the two HSMM antennas a minimum of 9–10 inches (approximately two wavelengths) apart; the more the better, up to about 10 wavelengths.
5. Inverter selection—determine the power
requirements of the laptop and the HSMM repeater and any other devices,
such as LED lights, etc. |
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