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BALUNs and stuff

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jul 17, 2019 9:40 am Post subject: BALUNs and stuff

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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