Manfred, total wire lenghts must have been 6-7m.
I fully agree to all your comments.
Powered iron core baluns are only suitable for tuned circuits, not for
A good example is the 1:4 balun behind a LC tuner to drive an open wire
feeder for multiband use, there ferrit cores will overheat quickly
From: firstname.lastname@example.org [mailto:email@example.com] On
Behalf Of Manfred Mornhinweg
> I did that when I got my copy of V.O.Stokes book many years ago,
> where I found his wideband transformer concept. Using the largest
> ferrit toroids I could get, they were similar to Amidon #61, I
> sandwiched them between 5mm thick aluminum plates 20x10cm for
> cooling, used 2x12 toroids and wound a 50:600 transformer with 3mm
> teflon covered wire to feed my terminated V-Beam from 160-10m. That
> worked perfectly well with all the power my modified L4B (3.5KV)
> could deliver.
The fact that you needed heat sinks makes me think that you ran those
ferrites at pretty high flux density. That was probably necessary to get
an acceptable wire length. How much wire did you have to wind on these
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