Size matters: QRP Balun

I recently took delivery of the 6m carbon fibre mast from Sotabeams. Planning on getting together a extremely lightweight and compact kit for portable radio. Starting with a simple choke balun for QRP dipoles and verticals. Parts used in this build are:

  • T68-43 toroid
  • About 50cm of RG-174
  • 2 x 2.5mm banana sockets
  • One BNC female chassis plug
  • Small enclosure

The RG-174 fit through the toroid 9 times which should provide adequate isolation and common mode current attenuation.

(Excuse the mumbling in the last half of the video, I think I forgot I was talking to someone other then myself)