The Ultimate Switchable Balun 4:1, 9:1, 16:1, 25:1, 36:1, 49:1 & 64:1
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- čas přidán 11. 09. 2024
- #MNHR
I decided to make the ultimate balun for those who wish to experiment with different types of antennas to find what works best for them.
The maths are:-
(Total turns / Primary turns)^2 = Conversion
Why did I do this particular balun?
Because I could!
Why make it switchable?
Why not?
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Nice concept. Can't duplicate it cause your doing everything off camera. Please remake the video for us newbies. Tnx
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
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.
how about posting the schematic?73.
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.
This is an UNUN, not a BALUN. Nonetheless, nice work...
While the 16:1 is at the balanced feed of a T2FD you are correct that the others are for unbalanced antennas.
What is the number and size or toroids
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.
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