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Spelling: LMR-400
LMR [1] equivalent of RG-8 [2] CoaxialCable [3], suitable for
microwave applications, such as 2.4GHz wireless LAN use.
LMR-400 [4] will attenuate a 2.4 GHz signal by approximately 0.22
dB/meter. Due to this loss, LMR-400 [5] cable should be restricted to
cable lengths of up to a maximum of 15 meters (~3.3dB attenuation). If
you have a cable run around this length, or need longer, you may want
to redesign your layout so you can place the radio closer to the
antenna. If that's impossible (such as you have a very tall tower to
cable), you may want to investigate LMR-600 [6] or LMR-1200 [7].
Time Microwave Cable Loss Calculator:
http://www.timesmicrowave.com/cgi-bin/calculate.pl
You can get LMR-400 [8] from Vak at the monthly meetings.
Links:
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[1] http://melbournewireless.org.au/?LMR
[2] http://melbournewireless.org.au/?RG-8
[3] http://melbournewireless.org.au/?CoaxialCable
[4] http://melbournewireless.org.au/?LMR-400
[5] http://melbournewireless.org.au/?LMR-400
[6] http://melbournewireless.org.au/?LMR-600
[7] http://melbournewireless.org.au/?LMR-1200
[8] http://melbournewireless.org.au/?LMR-400
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