I heard the fellow in the video mention he was using a Baofeng FM handheld tranceiver.
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Someone asked about using that radio at the workshop. Note the video said he had to use wide VARA FM mode to make it work.
The Digirig store has a cable pair for that radio too - one for operating VARA and one for Chirp programming.
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73
Mike N0QBH
N0QBH Mike Berg