I have an electronic constant speed propeller which is connected to the EMS tachometer wire. Sometimes the tacho readings on the ems are erratic. How can I isolate the governor from the ems and still have the signal going to the EMS and the governor? If I disconnect the governor the EMS works fine.
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Tachometer
- Thread starter portmanh
- Start date
- Joined
- Mar 23, 2005
- Messages
- 13,226
What kind of engine? Are they basically both hooked to the mag p-leads? It sounds like the prop system is somehow tainting the signal. Depending on the behavior, a resistor of a certain size may help. When its erratic, does it ALWAYS underread or overread?
- Joined
- Mar 23, 2005
- Messages
- 13,226
The governor is evidently doing something to the line - maybe loading the voltage down. A resistor applied inline to ONLY the governor could be a possibility, but you'd need to talk to the governor manufacturer to figure out whether or not this is possible or practical. Don't just experiment here - you could end up making your governor malfunction if this isn't viable. For your knowledge, we need a pulse that rises to at least 10V, and goes back down to ground.