[Amps] Centurion cooling improvement ideas for AM service

[Rob Atkinson, K5UJ]

Not at all.  Why?  A.  the > 3 khz guys are almost all using digital phase 
cancellation methods for sideband generation therefore there is no carrier 
and no opposite sideband to suppress.
B.  The few who are using 6 khz xtal filters (actually a little less--5.8 
khz) and analog method are using rigs with front panel adjustable 
microprocessor controlled carrier set points that allow them to place the 
carrier at least 200 hz below the -6 db filter skirt point so it is way way 
down the skirt; the opp. s.b. even farther away.  Oh sure, there may be a 
few hams who are attempting this with the wrong gear and don't know any 
better.  Anything's possible.    Are mistakes, booboos and a learning curve 
now forbidden?  I guess it's time for all rigs to be contained in solid 
epoxy blocks before being sold to us.  Didn't know experimentation was 
taboo.

Rob/K5UJ

<<<Having bass that extends well below 100hz will cause a SSB signal to be 
wide by  modulating too close to the carrier point, crossing over onto the 
other sideband, and virtually turning into a DSB signal  If you don't 
believe this just try tuning a "hi-fi" guy in on using the AM mode.  The 
signal will be 100% intelligible!!  You can even hear the carrier when you 
tune across one of these signals.  Plus the fact when one tries to force 
over 10db of extra energy at very low or very high frequencies the IMD is 
terrific and that also contributes to the width of the signal.

WY3D>>>

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