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ARRL QST: Build a Morse Code Bong
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February 14th 04, 12:05 AM
Len Over 21
Posts: n/a
In article ,
(N2EY)
writes:
In article , Leo
writes:
What I found interesting was the pattern on the (Tek?) scope above the
rig.....must have an incredibly slow sweep setting and very long CRT
persistance to display 'CQ' in pulses from the key like that!
0
Not necessarily!
At 30 wpm, the displayed code requires a sweep time of about 1.2 sec
Sigh...STORAGE SCREEN oscilloscopes can hold a display for
as long as AC power is on. Most DSOs (Digital Storage
Oscilloscopes) can do the same thing, just refreshing the screen
constantly with the same sampling.
Tektronix had screen-memory models and now has DSOs, along
with John Fluke, LeCroy, and other companies. I thought you were
employed in electronics, TAFKA Rev. Jim?
I used a Memoscope (serial #14) in 1957, 47 years ago, for
accelerometer pickup waveform recording in environmental testing.
Not a biggie except to a crowd that knows only P4 phosphors.
beep bong
LHA / WMD
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