Below are intresting observations about PL-259's from W7jwj. Harry holds the
CW record of over 75 WPM. They claimed "he had an error in the text with an
extra "e". He challenged them and they found an extra e (a dit) in the text.
Detecting an extra dit in text at 75 WPM is incredible. k7gco
In a message dated 10/22/01 2:23:00 PM Pacific Daylight Time, W7JWJ writes:
<< Ken
In the critical timing circuits used for the 3.58 MHz color burst signal
two identical coax cables must be timed precisely utilizing a dual
trace oscilloscope. If you screw up soldering a fitting and cut off an
inch or so of one end of a coax, you'll have to cut off the same amount
on the second cable carrying composite video. or start with a new piece
of coax.
"Coax fittings unscrew themselves after midnight." That's what
the chief engineer explained to me when I was first hired a KOMO-TV.
I found out they did. Every couple of months we would spend hours
tightening coax fittings, particularly the PL-259s.
Sometimes someone would screw up and replace a 75 ohm BNC
barrel or fitting with a 50 ohm model. If the cable handled a square
wave pulse one could easily see the differentiated reflection.
73
Harry W7JWJ >>
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