On Thursday 20 April 2017
11:14:22 you wrote:
> Thanks for all the
interesting contributions. The old book is a very
> nice one :-)
>
> I expect using
saturated coils rather than a saturated transformer can
> give better results
when it is used for keying a carrier (CW, DFCW,
> QRSS, OPERA...). But
that will be rather a narrow band solution. The
> transformer has its
advantages too. I will continue to improve the ratio
> between keyed and
unkeyed power later...
>
> 73, Stefan
>
Some idea for the
transformer...
May be that a small
toroidal transformer core for mainline power supply can be useful for 2
and 6 kHz bands. But toroid are without transformer air gap.
A core from an old output
transformer vacuum tube amplifier can surely be used from few hundreds
Hz to 10 kHz, may be up to 20 kHz if salvaged from an Hi-Fi push-pull
amplifier. Audio transformer are with air gap.
73 de Claudio ik2pii
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