Alex's yagi antenna -

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Robert Lucas

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Feb 3, 2026, 11:43:40 PM (5 hours ago) Feb 3

to Society of Amateur Radio Astronomers

I just used my nanoVNA to check the antenna and the result was not as expected. The antenna has been out in the weather for almost a year. I'm assuming it is time to dis assemble the antenna and clean all of the contacts. Any suggestions on how to clean and reassemble? My guess is galvanic action between the aluminum plates and the stainless steel spacers. Just tightening the nuts might not create the gas tight connection.

Cheers

Rob

Alex P

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12:24 AM (4 hours ago) 12:24 AM

to Society of Amateur Radio Astronomers

The Spacers are also Aluminum.

Measure the DC resistance from end to end elements .. It must be less than 1/2 Ohm or so or else YES, it will not properly function.

Totally Disassemble and clean every interface with sand paper, alcohol & wipe off any debris.

The SMA to patch disk connection needs close attention.

SMA connectors and LNAs are Not Waterproof, nor was that intended to be an Unprotected All Weather Antenna .

( didn't you 'redesign' the Patch Feed disk as you believed it shouldn't be 'shorted' to the Reflector ? Check Your Re-Repair Work )