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And to translate to ICAO terminology: Dynon FLT Time = ICAO Air Time. Transport Canada nailed me on this one. Vern

Re: IO-540 P-lead resistorS---SUCCESS! Well, I did what I do, and that's design interesting electronic gizmos. I solved the problem for my p-lead tachometer interface. It required external circuitry (see attached) that conditions the p-lead pulses and presents a digital pulse to the rpm...

I'm just saying... if Jeppesen and PocketFMS want to compete for my business, they should offer free trials on the SV system. Dynon could broker this, I'm sure. Just offer a free evaluation period. Of course it's their fault. Just like everything that goes wrong within my family is my fault...

...Since you brought it up....  We in the ROW (rest of world, i.e. not USA) don't get a free NAV database that's provided by Dynon... but we still have to pay the $500 map license AND buy a Jeppesen or Pocket FMS subscription. The 30 hour trial period is kind of useless when outside of the USA...

+1 on that. If you want to improve screen usage, I would vote for more customization of the EMS display. For example, its not always necessary to display the units-- I have a custom sensor that display BTDC timing-- but it's labelled PSI because there is no degrees widget. BTDC is fine by...

Electroair does not put out a tach pulse when it's turned off for the mag check. The only source for RPM at this point is the magneto. Setting the resistor value for reliable low-rpm indication does not work at high rpm due to the false high rpm readings... and vice-versa Using the AFS mag...

See post #8.

Thanks for the additional info. I tried with a 100K pot + 30K, but it wasn't enough, so I switched to the 1M pot. As for the electronic ignition, it's an Electroair. The only way to disable the unit is to turn the power off, which kills the rpm indication I will check the sensor debug data...

I'm a perfectionist, and I'm looking for the root cause. I think I have a handle on the magneto waveform and the plug regapping may help. Higher compression may cause more waveform issues as well. If I can't find the sweetspot, I have designed an external circuit that should help. Vern

Hey Jake, thanks. I have a 1 Mohm pot in series with a 30K resistor, yet I can't find a sweet spot. If I eliminate the erratic overspeed indications, my mag check is erratic, and vice versa. I think that the output of the mag varies with plug type and compression ratio as well as rpm. I'm...

I'm struggling to get the correct resistor value for my IO-540-D4A5. Initially I used 30K, but I got spurious prop overspeed alarms, so I wired in a trimmer potentiometer, accessible in flight. I can eliminate the spurious overspeed warnings, but now I get spurious dropouts in the rpm...

I'm struggling to get the correct resistor value for my IO-540-D4A5. Initially I used 30K, but I got spurious prop overspeed alarms, so I wired in a trimmer potentiometer, accessible in flight. I can eliminate the spurious overspeed warnings, but now I get spurious dropouts in the rpm...

I'm not ready to return the screen. It's happened twice in perhaps 50 cycles, but a lot of this is system configuration and debugging. Now that I'm flying, I will take notice if it continues. Oddly, I had a primary GPS failure today. I had momentarily switched off the master after booting...

I'm running version 7, but the previous incident was 6.x. Vern

Today, it happened again. The Dynon splash screen became rainbow colored, then the system rebooted, new splash, bootlog and normal start up. On shut down from this state, it did not revert to battery power, it just shut down. Yesterday, it powered up but did not find the pitch servo...

Thanks, my readout is now "BTDC PSI" rather than "BTDC VOLTS". Neither makes sense, but PSI is at least closer to the principal of timing advance based on air pressure. Vern

I have defined a Degree-Volts function that takes the output of my ignition controller which provides 10 mV per degree of timing advance. This function displays properly on my engine screen.  It normally reads 0 with the ignition off, 20 (degrees) with the ignition on, and varies with timing...

Do all of the SV mapping features work if I use the Jep or Pocket FMS aviation databases? My first assumption is that it would, but never assume. Thanks, Vern

So playing MP3 files is out of the question, too? ;). Actually, the issue is not really viewing pdf files, it's a convenient way for viewing the manuals. These could be encoded in a much simpler format for this purpose. Just to be clear, they do not have to be stored in internal memory, just...

Here's the issue: I'm limited to 7.5 A on my charging circuit and I have an aft battery that's not easily accessible to connect a higher capacity charger. My charging circuit was designed only for light-duty battery charging and not for powering up the panel. Hence I need a more convenient...