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  #1  
Old 04-14-2009
Robmk2's Avatar
Robmk2 Robmk2 is offline
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Default PT-40 Speedometer sender - Pulses??

Anyone know how many pulses per mile (or how many pulses per wheel revolution) the sender on the rear hub provides to the speedo. Also is it a Square or sine wave? I think its right at 30K per mile if the drum has 60 notches......

Thanks in Advance......
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Last edited by Robmk2; 04-14-2009 at 05:01 PM. Reason: added
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Old 04-14-2009
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Hey Rob,

I do not know the number of pulses , but check out this posted picture of the brake drum, maybe you can count the notches.

http://www.wanderlodgeownersgroup.co...ear+brake+drum
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Old 04-14-2009
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Thanks Bill -

60 notches on a 12Rx22.5 tire (which is
492 revs per mile) gives 29,520 pulses per mile - so now I know! I'm still interested if its a square wave or sine wave though. Any electrical boffins out there?
Regards
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Houston, Tx.
1982 pt-40 6v92 "Brigadoon"
1961 Jaguar Mk2
2004 Durango 4wd Toad
2010 Mazda CX9

Last edited by Robmk2; 04-14-2009 at 08:25 PM. Reason: added
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Old 04-14-2009
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My money is on it being a square wave.

Glenn
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  #5  
Old 04-15-2009
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Ed Wimberley Ed Wimberley is offline
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Default Speedo input

The pickup is a Hall effects sensor, basically a magnet.
Square wave is the correct answer. IMHO most any antilock
brake sensor off any auto should be replacement if adapted to fit
bracket set about .020 from notches in drum.
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