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I just had long talks with a guy who has been an avionics tech for 3-4 decades and a guy who retired from working with transponders at Rockwell Collins. They both independently supported the Dynon post just above.  Both stated that using radial wires (like I do on my HF ham radio antenna) does...

The ground plane should be perpendicular to the transponder antenna and it's radius should be at least as great as the length of the antenna. This if for a quarter wave monopole on a composite airplane. For more than that, I'm over my head.

I understand about ground planes. The question was why a good ground plane can't be installed on a composite aircraft. The prior discussion implied that a composite had problems that didn't happen with a metal plane and I don't see why a good ground plane can't fix the problems.

What is special about a metal airplane vice a composite airplane? Does it mean the antenna ground plane in the composite is inadequate? If so, can't that be remedied?

We may be talking at cross purposes. I used the buttons on the EMS to go to FULL. Then I tried to use ADD to decrease the fuel level. It went to a large negative number. When I selected FULL again, it showed 34 gallons, which is right. Are you saying that in doing this I messed up my...

I added 17.5 gallons of fuel to my CTSW and found that I had 25.5 gallons by sticking the tanks. I decided to correct the fuel level remaining by taking the tank to full and reducing it by 8.5 gallons. Whenever I did that, I ended up with a very large negative number. Can one select Full and...

Not sure where to put this inquiry. I check the box to be notified of replies to threads but get no notification that I can see. How does one use this feature?

Flight Design CTSW with D100 and D120, upgrading to SkyView. There is another CTSW with same and a Dynamik with other Dynon gear on the same field.

Can you adjust voltage display that way, also?

Before 2020, any position indicator that will drive the ADS-B Out will get you in the system, right?

I agree with Emidio that the AOA is buried where it is and should be mounted higher. When I was looking at the HUD in Oshkosh, one of the things I wanted to see was an HUD AOA. An AOA that is buried is not too bad if you are flying a two-pilot crew and the PF is on the AOA on take-off and...

Is your box a dual frequency receiver or only a 978Mhz receiver?

I think he means can he let the two wires run adjacent to each other or will the plug wires cause some cross talk.

From the installation manual: "The oil temperature sensor is very susceptible to voltage differences between the engine case and the negative terminal of the battery." "If your panel is not metal, or is otherwise isolated from engine ground, connect a 14 AWG or larger wire to the instrument...

When I get a big amps range swing quite rapidly, does that imply I have a grounding or other connection issue? If so, any place to start working on it, or just "all over"?

Flight Design CTSW, factory wired.

My Dynon 120 indicates voltage at full throttle of 13.3-13.4 volts. A DVM reading at the cigaret ligher shows 13.8=13.9 volts. How do I change the Dynon to read the correct voltage?

Is there a description of how Dynon measures volts and amps on the Rotax 912ULS? I'm trying to understand what information is displayed, where it's gotten, how it's processed, etc. EMS D120

Was at a radio installation center this week that handles Garmin and Avidyne and the owner said that Garmin said that it would not promise that ARINC429 would always work with their devices. They reserved the prerogative of changing their output, I assume.

What GPS is needed for ADS-B out with the SkyView?