speedo signal modulation

["Denis, Jean" <Jean_Denis@domain.elided>]

To the guy who wondered if the output from a GTV6/Milano/75 speedo sender
was frequency or amplitude modulated:
i stuck a meter on the output of the under-seat amplifier last night and,
with the rear wheels off the ground, measured 150Hz plus or minus 50Hz
depending on speed. Which makes sense, because the sensor pickup is a
magnetic Hall effect pulse-generating thingie. The low frequency explains
why I can't tune in to it on my radio. 

i've also noticed that the car is not nearly as much fun to drive with the
rear wheels off the ground and although it seems safer, i am wondering if
this is any different from a front-wheel drive car and what the fuel mileage
would be like?

Jean Denis
'89 Milano Verde (speedo meter kaput)
'93 Acura Legend (Yaawwnnn....)
'80 Raleigh Super Course (minimal radar target)

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