The resistor is inserted in the tach line. I'm guessing the impedance of the RPM measuring circuit is pretty high so a high value, in-line resistor is needed to ensure spurious signal voltages are dropped below the measurement threshold.
The resistor is inserted in the tach line. I'm guessing the impedance of the RPM measuring circuit is pretty high so a high value, in-line resistor is needed to ensure spurious signal voltages are dropped below the measurement threshold.
See my build log at:http://www.mykitlog.com/lowandslow/
So in line in the + line?
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It sounds like your system uses both of the tach leads. (I'm assuming we are talking about a Rotax.?) If that is the case, I'd try it there. Good luck.
See my build log at:http://www.mykitlog.com/lowandslow/
Yes, the instrument has a RPM+ and RPM- input
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Problem solved, a 220Ohm 2 Watts Resitor did the trick
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This is good news. Thanks for the update - one more tool in the tool box.
See my build log at:http://www.mykitlog.com/lowandslow/
I bought my engine from salvage and the regulator is the original as far as I know. No entry in the logs about replacing it. However, I bought a B&C to carry in the plane based on recommendations made in another post. I have a GRT EIS and have not had any problems during this first 40hours and I don't have a resistor in the tach line. Given the proper operation now would adding a resistor now be counter productive or would it not be an issue with the current regulator. My concern is that I go somewhere, loose the regulator, install the new one and then find I have the issue with the B&C and need a resistor for the B&C.
Fred
EAA, AOPA
KF5 (N49FK & N36KJ)
Phoenix, AZ
I'd go ahead and put the resistor in the tach line. It won't hurt anything and if your unit is susceptible as mine was (with the B&C unit) you'll be ready to go. Check out pages 14 and 15 of the GRT troubleshooting guide for more info. I'd also put the B&C unit in now and carry the original regulator as the spar. The B&C has a couple of features that sold itself to me - the most important being over voltage protection.
See my build log at:http://www.mykitlog.com/lowandslow/
Agree, put the resistor in now when it is convenient. Mine went about 500 hours before I needed to install a resistor.
Jim Ott
Portland, OR
Kitfox SS7 flying
Rotax 912ULS
I got it on ebay
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