On Jul 8, 2006, at 6:16 AM, Peter Chadwick wrote:
>> From memory, sweep tubes are rated for several kV of plate volts
>> during the pulse, so breakdown (flashover) isn't a problem per
>> se. . This suggests that provided you don't exceed the
>> dissipation, you can run a high plate volts and have a good swing
>> above the knee of the curve, and arguably, better linearity.
> Exceeding the plate dissipation is another matter altogether, and
> is I suspect, done at the expense of tube life if not linearity.
> It is amazing what you can get away with tubes though: remember the
> early radars that really hammered tubed not designed for pulse
> service.
Good point, Peter. Keydown / AØ / NØN / is almost as far from SSB
voice service as is pulse radar service -- which is why I prefer to
tune up for SSB service with a 30% duty-cycle tuning-pulser or with
50wpm dits.
> 73
> Peter G3RZP
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R L MEASURES, AG6K. 805-386-3734
r@somis.org
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