On Tue,3/29/2016 11:28 AM, Lynn W. Taylor, WB6UUT wrote:
On 3/29/2016 10:38 AM, Jim Brown wrote:
WRONG! CW speed has NOTHING to do with bandwidth, which is determined
by RISE and FALL times of the keying waveform and distortion in the
RF stages.
So, I can occupy zero bandwidth at 10,000 wpm CW and my occupied
bandwidth will be the same as 5 wpm as long as the keying waveform is
right?
No, because even the best rise/fall waveform has SOME harmonic content,
and CW speeds of 10,000 WPM have no practical meaning. But you CAN
occupy extremely narrow (a few Hz) bandwidth with a steady carrier,
because there's nothing to excite IMD. Bandwidth would be greater than
that only to the extent that the carrier is modulated by power supply
noise or phase noise. And, of course, any distortion in the RF chain
will produce harmonics.
73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
