The Ultimate Switchable Balun 4:1, 9:1, 16:1, 25:1, 36:1, 49:1 & 64:1

[@blugoose86]

Nice concept. Can't duplicate it cause your doing everything off camera. Please remake the video for us newbies. Tnx

[@DaDitDa]

This is an UNUN, not a BALUN. Nonetheless, nice work...

[@A.R.O.T.A.]

While the 16:1 is at the balanced feed of a T2FD you are correct that the others are for unbalanced antennas.

[@paul.alarner6410]

how about posting the schematic?73.

[@A.R.O.T.A.]

Didn't see any point as it was only done as an experiment to see if it would work. I still have found no use for the 25:1 and 36:1 settings and the case is not waterproof due to holes drilled. I simply use it to determine the best balun/unun for the antenna and then construct one with the appropriate type.

[@santojobbarakasan8826]

Hello, interesting assembly. I would like to know if you have been able to measure the final result with a Nano VNA or similar. Thanks for your contribution

[@A.R.O.T.A.]

Sort of I used a variable resistor that I adjusted to the required resistance using a multi meter to verify the approximate resistance for each position. Unfortunately I lost the footage for that video I will have to re-record it all from scratch at a future date.

[@rickmcgaver4698]

What is the number and size or toroids

[@A.R.O.T.A.]

Sorry forgot to mention that. I used FT240-31 for the common mode choke and FT240-43 for the switching balun. Also the capacitor was a 100pf 3KV.

[@super66craig]

Hey John, this is awesome stuff But it would be great if you could center the camera and let us see the winding process. Thanks