Polar Wireless

3 replies [Last post]
Anonymous's picture
Anonymous

I have a Polar 720i with speed and cadence sensors set up on two bikes. I am not having any problems with the speed sensors or the heartrate, but the cadence sensor rarely works on either bike. The bikes are set up the same as last year, and last year I only had the usual interference problems.

Should I just get a wired computer for cadence to increase reliability? Is it possible I just need to change the batteries?

Nevermind. I just found a way to increase the range of the cadence sensor. I am going to try that first, and then I will try a new battery. Or maybe Vice Versa

Anonymous's picture
Siggy (not verified)
directional

I find that my 720i cadence is very tempermental about placement.
If I have my watch on the bar on the left side in line with the sensor, it almost never has a problem, but if the watch is on my left wrist, it almost never works.
It took a couple of trials as to where to place the senson and watch.

Anonymous's picture
Michael (not verified)
cadence sensor placement

"The cadence sensors likely need to be re-aligned. Cadence sensors are kind of finicky.

BTW, what way did you find to ""increase the range of the cadence sensor?"""

Anonymous's picture
mc (not verified)
Polar re-wiring

You can open up the Cadence Sensor and flip 2 of the wires to increase the signal strength. I've done this and it works very well... only thing is that the battery will not last quite as long.

Instructions can be found on Polar's website: http://www.polarusa.com/service_repair/show_faq_con.asp?ID=26

To increase the transmission range on the S510/S520/S710/S710i/S720 s-series speed/cadence sensors only:

Remove sensor from the bike.
Undo 2 small screws holding the two halves of the sensor together with a small philips screwdriver.
Carefully remove one section of the housing (end with cable ties).
Carefully slide the exposed printed circuit board a little way out.
Remove the jumper plug from the inner most pin and insert it over the two pins closest to the edge of the circuit board. This will give the maximum range. Shorting out the inner two pins with the jumper plug gives the medium range.
Re-assemble carefully in the reverse order.
Becareful not to over-tighten the two screws which can either distort or crack the case leaving the unit not water resistant.
Further information can be found on Page G82 of the S510 user's manual or Page G90 of the S710i/S720i user's manual.
TO ENSURE SENSOR WATER RESISTANCE IS MAINTAINED, PLEASE BECAREFUL DURING RE-ASSEMBLY THAT THE FINE RUBBER SEALING RING AND CASING ARE NOT DAMAGED.

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