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Monster Media 1993 #2
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TM621
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1990-09-21
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945b
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22 lines
I have compiled statistics from input that was sent to me about the reliability
of the Kenwood TM721/TM621 dual-band radios. The message I send asked for the
following data: Number of radios owned; Time owned; Number of failures; Time
owned before failure. Here is the compilation of that data. This is data only;
reach your own conclusions. Also, if anyone wants a copy of the raw survey,
let me know with your address and I'll send it out....Mark KC9C
TOTAL NUMBER OF RADIOS OWNED: 16
AVERAGE LENGTH OF TIME OWNED: 21.2 months
TOTAL NUMBER OF FAILURES: 3
AVERAGE TIME TO FAILURE: 15.3 months
CALCULATED MTBF*: 113 months (9.4 years)
FAILURE MECHANISMS: 1 microphone input circuit; 1 low output power; 1 unknown
*MTBF = Mean Time Between Failures. For empirical data (such as this survey),
it is equal to: [(Number of units) x (avg. operating time)]/(no. of failures)
73, Mark KC9C@KG6XX