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Aha! I used a GP input for my timing advance meter, but I've always been suspicious of the measurement because it was sensitive to ground potential differences. Using the TC input to make a differential measurement should eliminate this error. I guess the result will be displayed in degrees...

It's very important to ensure that your plugs are all in good condition and have identical gaps. Any problems with the plugs, wires or mags will cause erratic readings. The P-TACH device helps to stabilize tach signals, but won't fix misfire problems in the ignition system. I tried misgapping...

The problem you faced and the solution is very common in audio systems. Ever wonder why stereo systems have grounding lugs in the back? That was for connecting all of the equipment chassis together to reduce noise and interference. There are a lot of lessons to be learned in this thread, but...

I don't think that overdriving the EMS inputs is good design practice. I use isolation diodes with the anodes connected to the EMS, like shown in the link. http://www.vx-aviation.com/sprocket/photos/panel_elec/schematics/EMS.pdf Vern

Here's a proposal:  A circuit like this should work without significantly affecting measurement accuracy.  It's important to have a low impedance ground for the clamp diodes (short connection to main system ground). The resistors prevent unwanted failure of the clamp diodes.  The clamp diodes...

I'd check your pitch servo shear screw. Vern

Would a pair of matched resistors, say 5K0 in series with the shunt sense points provide adequate protection? If so, they could replace the fuses or fusible links currently used. I know that they would change the gain of the current sense diff amp, but this could be adjusted in software or...

??? The SV fuel calibration is only good for one aircraft attitude. For example, calibrating a tail dragger in 3-point attitude will give accurate indications on the ground, not so much in flight. Conversely, calibrating a tail dragger in level attitude by jacking the tail will give more...

I have airspace warnings on my Garmin GPS and they are useless. In complex airspace (southwestern B.C.) you get constant warnings and a change in heading will give more warnings. It takes at least 16 frequency changes on a 20 minute flight from Victoria to Vancouver through terminal airspace...

That's your problem. The Ray-Allen switch needs a pair of isolation diodes to work in this environment. See http://www.rayallencompany.com/RACmedia/instructionsRS2withmods.pdf Vern

Murray, I get an error (even with antivirus off) "Application cannot be started. Contact the application vendor." Any tips? UPDATE: Managed to run in Vista rather than 7, but screens seem corrupted. Thanks, Vern

Related, but a bit off thread: You provide fuel flow in tenths of gallons, but only in integer liters. This provides less precision in leaning or balancing injectors. Please allow fuel flow precision displayed in tenths of liters, even if the resolution is only 0.2. Vern

Can't even sneeze around Vancouver/Victoria without being in US class C. Last year, I had to get a letter from the FAA just to depart Victoria! Even our VRF checkpoints are in US airspace. Murray, check your PMs about your EMS editor. Vern

The SOP at my home airport is to make a telephone call to get a Transponder code, as the tower will not normally issue these codes. Consequently, I power up my SV Classic on internal battery, then make the phone call to get the code, then enter it using the buttons on the SV. Unfortunately...

Hi Murray, I sent you a message re problems with your download. Thanks, Vern

I notice in the User Datalog that flap position is recorded during the AoA calibration routines. Does this mean that AoA indication includes adjustment for flap position? Vern

I see that in SV 15, you can config the system into calibration mode that allows the static/transponder check to be performed without power cycling. Yeah! Vern

When I was chasing audio system noise in my Rocket, I could hear the transponder ticks in my headset. Turns out that I could hear this noise even with the headset unplugged! The solution was to take the aircraft outside. The ES pulses from the transponder were the culprit. Inside a metal...

As long as you have more serial ports down under[ch128526]

Many Canadians will not bother upgrading their GA aircraft to ADS-B.  It is expensive and there are no rebates.  With all of the annoyance of EAPIS, customs officials packing attitudes and now the cost of ADS-B compliance, it's easier just to stay in Canada. On the other side, the Class 3...