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| Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system. |
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#1
04-14-2009
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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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Rob 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 05:01 PM. Reason: added 
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#2
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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Bill Pape 1988 FC, Silver Edition Commerce, Michigan
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#3
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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Rob 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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#5
04-15-2009
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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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