Topband: Rig Comparisons For Transmitted Noise

[Jim Brown]

Over the last decade or so, Rob Sherwood's extensive work on receiver 
performance has done much to improve the receivers in modern rigs, but 
transmitters have been sadly neglected.

A month or so ago I began work on a project to compare ARRL test data 
for selected rigs, focusing on the trash they generate. I shared an 
early version of that work on the Elecraft reflector, and it seems to 
have found it's way to Yaesu, who has just put new firmware on their 
website to improve the CW waveform.

I've done a lot of work on the piece since then, and it's near its final 
form. If you're thinking about buying a new rig, it should give lots of 
food for thought. As I read FCC Rules, this report shows that an 
operator using many modern rigs would be in violation of 97.307 (a) and 
(b).

http://k9yc.com/TXNoise.pdf

Also, if you haven't already done so, see the slides for K6XX's 
excellent presentation on Signal Cleanliness, which, among other things, 
shows how we can set up and operate our existing rigs to produce a 
cleaner signal.

k9yc.com/K6XXAmpTalk.pdf

73, Jim K9YC