[Lowfer] OK, how about this...

[lowfer@mailman.qth.net]

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>Something much more accurate than rubbering the crystal, but less complex
than attenuating my TS-570D.  Anything with less than 100 parts or so?
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I think you'll find the first and last of those requirements to be mutually exclusive.  A good DDS circuit could be "much more accurate" (if by accurate one actually means repeatable, rather than precise; shifting a crystal frequency can be made as precise as you want it to be, but at the tradeoff of having to measure and perhaps trim it once in a blue moon).  On the other hand, controlling a DDS to accomodate that assortment of modes is no trivial matter.  Figure on programming a microcontroller at the very least.  Are you sure it wouldn't be less complex to to hook a big ol' dummy load to the 570 and hang a coupling loop a foot or so away to pick off a couple milliwatts?  :-)