Andy said:
Some of us don't have such large antennas as you, Peter. For 1 Watt ERP
I would need approx 4kW RF.
Yes, I am well aware of that - and that is why I mentioned I5TGC's LF
antenna, which must be the smallest of the LF antennas in the LF group.
However, the subject was loading coil cooling - and was it necessary.
I only quoted my transmitter power and antenna current because that
was the only experience I had of using higher power at LF
While on the subject of power amplifiers the only successful design
that I have seen is the one by G3LNP, see 'The LF Experimenter's
Source Book', second edition.
I have seen solid state amplifiers that use many separate amplifiers
with the outputs combined using a ferrite transformer. This might be
the way to go in the construction of a less lethal design.
The Decca transmitters were designed with safety (and reliability) in mind.
--
Regards, Peter, G3LDO
<g3ldo@zetnet.co.uk>
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