[CharlieWaffles]

I just got done riveting my antenna doubler into my -10 for a Comant VHF Antenna. According to the installation recommendations (http://www.cobham.com/media/5045/antennainstallationguide.pdf) says that there should be a .003 Ohm reading for the antenna base to aircraft ground. I don't have my antenna mounted yet, but I read the resistance from the doubler nutplate to the ground and I am getting a reading much higher than .003. I am getting .2 Ohms. (https://skydrive.live.com/#!/?cid=3...879AB2ED26&id=3B3E6F879AB2ED26!2329&sc=photos).

Am I measuring the wrong resistance or is this just because I am not measuring the antenna baseplate to ground?

 

[Lycosaurus]

lead resistance?

...I am getting a reading much higher than .003. I am getting .2 Ohms...

First things first... Touch the tips of the measuring leads together and see what resistance reading you get. The 0.2 Ω sounds like it could be the measuring lead resistance.

To measure something of the order of .003 Ω will need a different instrument.

 

[az_gila]

First things first... Touch the tips of the measuring leads together and see what resistance reading you get. The 0.2 Ω sounds like it could be the measuring lead resistance.

To measure something of the order of .003 Ω will need a different instrument.

After you have done the above, put a screw in one of the nutplates and re-measure using the screw as one point. The black stuff (lube) on the nutplates may be reducing the reading.

Usually the antenna manufacturer calls for a star washer and nut here to get good electrical contact.