[Mich VHF UHF Society] 6m yagi issues; looking for 1.2/2.4g antennas
Jeff Berman
k9yr at yahoo.com
Sun Jun 28 21:04:30 CDT 2020
Patrick,
Check this link on troubleshooting M2 driven elements. https://www.m2inc.com/M2DETroubleShoot
Hope to work you sometime in a contest
Jeff K9YR EN52
Sent from Yahoo Mail for iPad
On Sunday, June 28, 2020, 20:36, Patrick Thomas <p-thomas at mindspring.com> wrote:
Hi all,
When I put my m2 6m3 up for the June contest, I encountered needle-pinning SWR on the rig SWR meter... further checking showed the resonant frequency had moved up to ~60 MHz. Fiddling with coax and antenna fittings - and even the setscrews on the shorting bars - resulted in no improvement.
A couple days after the contest I went back out there, unhooked the balun F connectors, cleaned everything out with alcohol, put it back together, went inside, and voila... worked like a champ.
Fast forward to a few days ago when we had stations from Japan (!?!?) audible on 6m, and sure enough, back to 5+:1 SWR.
Is anyone aware of something else to check on these antennas? Figured I would ask this group before going back to ask tech support or ripping things apart. I didn't notice any evidence of corrosion around the F connector and everything inside when I was cleaning looked like it had never seen the light of day since being assembled. There is a bit of "patina" on the aluminum parts, but since it was working great with those same elements (like consistently fine with no evidence of intermittent failure for a few days), I'm a bit at a loss. Rotation position also doesn't matter.
One of the set screws unfortunately did have the allen slot strip out... it is very tiny (1/16" or so?) and is in a hole not a whole lot bigger than that.. not sure if they make screw extractors or helicoils or whatever in such small sizes but again maybe you guys know... or maybe I should just re-tap it for a larger setscrew?
Also if there's anyone near (or willing to be near) the Novi area who has a directional 23cm or 13cm antenna they're looking to get rid of, please let me know. Actually I would be interested in dish feeds too as it's just a matter of time until I get new mesh into the 8' C-band dish I have in the yard... but thinking more like yagi or corner reflector in this case. Something I can bring up the hill with me for the UHF contest in August which is (sadly) only "a few weeks" away!
Thanks!
Pat
KB8DGC
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