[1000mp] FT1000MP Key Clicks on first element DO Matter

[1000mp@mailman.qth.net]

Pete, N4ZR wrote:

"Is this correct?  Seems to me that if the suppressed carrier frequency
of the test RX is 700 Hz off the Field's frequency, and the test RX has
good, cascaded 400 hz filters, for example, then its response will be
only down ~ 6 dB (at a guess) at 300 Hz away from the Field.  That
doesn't sound to me like a very good test."
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If you tune outside of the receiver's passband where you can no longer
hear the CW signal but you hear clicks, the transmitted signal has
clicks.  This is exactly what happens when you hear key clicks (but no
signal) in your receiver during a CW contest, for instance.
==========

"Doesn't the speed of the keyed CW also enter into this?"
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Yes, but to a much lesser extent.  The generally accepted equation for CW
bandwidth with a clean CW signal according to keying speed is WPM X 2 =
BW in Hz.  In other words, a clean 50 wpm CW signal will have an
approximate bandwidth of 100 (+/- 50) Hz.

Actually, according to the ARRL, a string of dits sent at a 60 wpm rate
where the rise & fall time of each dit is 5 msec has a -20 dB bandwidth
of 150 (+/- 75) Hz.

73, de Earl, K6SE