The NHFN station hardware has proven, on average, to be quite reliable. The following stations were visited to perform various maintenance and/or repair operations.
BBEB: Ran radio tests on Wilan link to Space Sciences Lab at 18 dBm and at maximum power (23 dBm) to ascertain effect on dropped packets. At 24 dBm power, the throughput was 6 times higher than at 18 dBm power and the number of dropped packets reduced from 4.6 BRIB: Numerous frame relay telemetry problems were encountered during August and September and the station was visited several times to troubleshoot and correct the problem.
CMSB: Quanterra hung after 8/17 reboot. The power was manually recycled and the Quanterra came back up.
CRQB: Quanterra hung after 8/17 reboot. The power was manually recycled and the Quanterra came back up and was functioning normally.
HERB: Velocity channel was found in September to not be responsive to events. The problem was traced to a blown fuse in the power system although it is unclear as to how that problem effected the responsiveness of the velocity channel.
RFSB: Visited station several times to repair frame relay and power supply problems.
SMCB: Quanterra hung after 8/17 reboot. The power was manually recycled and the Quanterra came back up.
W02B: Telemetry link went down in October and again in December due to an antenna problem.
Berkeley Seismological Laboratory
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