I got a similar problem by passing through an alarm gate in a shop. But my
bike computer only reaches 99 km/h. I have to train me more to reach you 369
km/h...
"John Henderson" <[email hidden]> wrote in message
news:[email hidden]...
Quoted message said:I came home from my morning ride and found that my bike computer
(a VDO C10 - wired, not wireless) had registered a max speed of
exactly 369.00 kph (the C10 reads to 2 decimal places).
Normally, I see a figure in the 40's or 50's.I got to wondering about the cause, and thought that I might have
ridden close to a strong AC magnetic field at mains frequency.
Since the Australian mains frequency is 50 Hertz, this could have
switched the fork-mounted pickup at either 50 or 100 times per
second (depending on whether both half-cycles did the switching,
or only one - an AC electromagnet reverses polarity with each
half-cycle). Given that the computer is configured for a wheel
circumference of 2050 mm, that gives me a switching frequency of
50 Hertz exactly (to 3 decimal places) for 369 kph.So I think I've found the cause, and it got switched only on
alternate mains half-cycles. Alas it wasn't a sudden, dramatic
increase in my fitness. Still, it's nice to know the C10 is
capable of registering pulses at that speed.John