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View Code? Open in Web Editor NEWa PCB for a lightweight qrp Balun (1:1, 1:4 or UnUn 1:49)
License: Creative Commons Attribution Share Alike 4.0 International
a PCB for a lightweight qrp Balun (1:1, 1:4 or UnUn 1:49)
License: Creative Commons Attribution Share Alike 4.0 International
I found no UniBalunLibrary.pretty in Version 1.2. Could I copy from 1.1?
If I understand correctly you've found some significant efficiency with this combo.
I'm looking to replicate your results, it would seem you had the smaller toroid sitting inside the larger one, is this correct?
Would this also marginally increase power handling? say 20W SSB / 10W FT8?
Have you any advice for size of copper wire?
Sounds in theory that things might get tight inside the 7.9mm ID of the smaller toroid.
Also any thoughts on good cores for 1:1 and 4:1 baluns running ~ 80M to 10M bands?
Thanks for making your information available,
I apologize if I missed it, but could you please clarify which capacitor you recommend for the 1:49 version? I am trying to build this amazing project but don't know which capacitor to use.
A part number would be awesome if you have one handy as I am not familiar with electrical engineering.
Edited to add, could you also recommend the shrink wrap that was used in one of your photos to wrap the entire PCB? Looks very professional.
Thank you!
Myles
Jan, I am a big fan of less cable whereever possible. Do you think it might be possible to change the PCB design to be able to use a BNC male plug 90 deg angle as well? I have found this one on amazon: https://amzn.eu/d/83ZCG39 but did not order any by now. Maybe it fits without the need to change the PCB design...vy73/55, Tom (DL1HBT)
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