On Sunday 14 December 2003 19:38, gw4dgu@blaenffos.org wrote:
> > It is a mistake to apply a commercial broadcast economic model to a ham
> > radio station.
>
> I don't disagree at all with this. The point I was trying - however
> ineptly - to make is that solid state technology requires a different
> approach to traditional tube design.
Is it all that different? Whatever the technology, different devices offer
benefits/disadvantages. The feedback systems are most easily applied round a
transmitter rather than an amplifier, and I'm not sure that it makes much
difference what the output stage is.
12V bipolars are undoubtedly poor in linearlty terms, but $/W for brute power
(at hf) is not so bad. In general the typical cw to pep derating for linear
operation with semiconductors is in the regions of 50%, the same as we apply
to a 4CX250, for example.
Steve
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