I had reports that my TS-440S was not as clean as my old TS-830S, so I
decided to try and do something about it. Since most IMD occurs when the
transistor is at maximum peak collector current - when Vc is close to its
minimum, I figured that giving the transistors more "head-room" might
help. The 440 is speced at 12v to 16v, so I increased Vcc to 16v and got
on the air. Several friends reported that the IMD was reduced with 16
volts. [note - the electrolytic caps in the 440 are rated at 16wv and
the output transistors are rated at 18VDC of Vcc]
cheerz
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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