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BALUNs and stuff

 
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nuckolls.bob(at)aeroelect
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PostPosted: Wed Jul 17, 2019 9:40 am    Post subject: BALUNs and stuff Reply with quote

Got a VNA up and running on a laptop.

Will try to get a Jim Wier ELT antenna
fabricated over the next few days to
see if a common mode choke is really
effective/necessary.

I'll also look at an exemplar
Pawsey Stub and a legacy 'Aviation
BALUN' featured in so many anointed
documents over the past 50 or so
years.

By the way, I was curious about how
well those little VHF/UHF 'rubber duck'
antennas worked on contemporary VHF/UHF
hand-helds. Screwed an antenna off my EMS
talkie to the VNA and ran a 100 to 500 MHz scan
which yielded the following plot:

[img]cid:7.1.0.9.0.20190717122807.06247668(at)aeroelectric.com.0[/img]

Sho 'nuf . . . the little critter has SWR
'dips' that span the frequencies of interest.

Pretty cool . . .


Bob . . .


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