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» Homebrew ATU for 160m with a way too short antenna!
antenna - A dual purpose antenna Icon_minitimeToday at 12:32 pm by Alan Pilot

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» South Coast PMR net report
antenna - A dual purpose antenna Icon_minitimeYesterday at 10:17 am by Victor

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 A dual purpose antenna

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SangueG
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SangueG


Call Sign : 26-CT-3971 / M7TDV
Posts : 639
Times Thanked : 30
Join date : 2021-01-30
QTH or Location : Cirencester, Gloucestershire
Equipment Used : Little radios, home-made antennas

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PostSubject: A dual purpose antenna   antenna - A dual purpose antenna Icon_minitimeThu Sep 30, 2021 8:53 pm

It's a Yagi and an arc welder...



I've had an RF burn from touching the end of end fed half wave before at just 8 watts. It was uncomfortable. I think touching the end of this one would be just a little more uncomfortable Shocked

GaryWilson, kilomike, Les-1, Victor and 43CT016 like this post

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Victor
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Victor


Call Sign : 26-CT-3228 Ham M7VIC
Posts : 3445
Times Thanked : 215
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: A dual purpose antenna   antenna - A dual purpose antenna Icon_minitimeThu Sep 30, 2021 10:04 pm

Hopefully it's burned itself to resonance, SWR should be lower now! Very Happy Very Happy

Great find Neal. antenna - A dual purpose antenna 1f44d 



Got bit once, felt like a bite on the palm of my hand....bit sore and red mark later on....irritated all evening....few hours later there was a series of red dots/holes with blisters forming under them and it flipping killed! Kept me awake all night and looked a right mess the next morning. Took weeks to completely heal!!!

30 odd years later I still have the scars and marks on my palm! Shocked

Moral of the story.....don't let a CB mate key and read the SWR whilst you're adjusting the antenna.....he might find it funny to key-up whilst you're adjusting it!

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Alan Pilot
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Alan Pilot


Call Sign : 163-CT-220...MW7TTA
Posts : 1711
Times Thanked : 47
Join date : 2019-11-19
QTH or Location : Anglesey North Wales
Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+.

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PostSubject: Re: A dual purpose antenna   antenna - A dual purpose antenna Icon_minitimeFri Oct 01, 2021 12:38 pm

How does this one work.
When i took my end-fed down i pushed the coax/pl259 up into the pole that my hf multiband vertical is on pole is only 3m long.
This coax is not connected to anything at all.
The other day i had been using the vertical for some hours on ft-8/ft-4.
I went out of the shack and no idea why but i pulled the coax out of the bottom of the pole.
Couldn't believe it the pl259 was hot not burning hot but quite warm.
???????????????????????????
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SangueG
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SangueG


Call Sign : 26-CT-3971 / M7TDV
Posts : 639
Times Thanked : 30
Join date : 2021-01-30
QTH or Location : Cirencester, Gloucestershire
Equipment Used : Little radios, home-made antennas

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PostSubject: Re: A dual purpose antenna   antenna - A dual purpose antenna Icon_minitimeTue Feb 15, 2022 8:16 am

Just seen your post Alan. Have no idea Laughing Or maybe I have a slight idea.. There's some antennas you can mount on car windows aren't there, that don't have a physical connection between the feeder and actual radiating element that manage to couple through the glass. Maybe was working similar having the cable and very near to the antenna was doing the same thing?

Just came across another video whilst looking into ddrr antennas in relation to this NVIS thread. Posting here as related to my first posting above. An oldie so people here may of seen before, but new to me...

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PostSubject: Re: A dual purpose antenna   antenna - A dual purpose antenna Icon_minitime

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