another minor rural range test
quozl at us.netrek.org
Tue Jan 23 17:30:39 EST 2007
Having been enthused by linux.conf.au, my wife and I set up some more
rural range tests of the B-Test-1 units.
- 2007-01-22 A, test from a high point on terrain, failed probably due
to terrain obstruction or very high temperature,
- 2007-01-22 B, repeat test using 1.3km known-good path, to exclude
specific units from failure of 2007-01-22 A, worked fine, extended to
- 2007-01-23 A, repeat test using 1.3km known-good path, during midday
sun, to exclude solar coverage from failure of 2007-01-22 A,
- 2007-01-23 B, test unit in full sun for an hour, monitoring signal and
noise level, to exclude battery charge level and temperature from
failure of 2007-01-22 A, logged ticket 800.
We've restored use of a fantastic diagnostic tool ... an ordinary AM
broadcast radio tuned to one of the emission frequency harmonics of the
laptop. With experience, one can learn what the laptop is doing as a
result of coverage changes. It can also be placed near the antennae to
hear the transmission pulses. Sort of like an electronic stethoscope.
Detailed test reports:
Graph of signal and noise over temperature:
James Cameron mailto:quozl at us.netrek.org http://quozl.netrek.org/
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