KO7I:
>This is the most useful bit of info that has come across my computer's
screen in the past few months.
And possibly the most misleading. ARRL changed their
methodology for measuring IMD around 2007 by using a 3 Hz BW spectrum
analyzer to separate IMD effects from phase noise effects. The human
ear has ~50 Hz bandwidth at best so their results are very
misleading and not comparable to earlier ones listed on the same
chart. If you want meaningful (i.e. what you will hear with your own
ears) results that are comparable over time stick to Sherwood's summary.
http://www.sherweng.com/table.html
73, Bill W4ZV
|