I use a highly modified HO-10, which is basically the same scope in a
different package.
I used to use the trapezoid pattern all the time. Mine is wired up with the
t/r relay system to deflect the spot off the tube when the transmitter is in
standby mode. But I found that with the trapezoid that the unmodulated
carrier eventually burnt a vertical line on the scope tube, even though it
registered only briefly between syllables. I now use the envelope pattern
to monitor modulation, and use the trapezoid only to check modulation
linearity. In evelope pattern, the horizontal base line appears only on cw,
during key-up conditions. I work some cw, but not enough to burn a line on
the scope. I like to monitor my cw waveform just like I monitor my
modulated waveform on phone.
Don k4kyv
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