Actually, 1% of the transmitted power is at the -20 dB level, not the -10 dB
level (which would be 10% of transmitted power).
____________ _________ _________ _________ _
From: Elecraft_K3@ yahoogroups. com [mailto:Elecraft_K3@ yahoogroups. com] On
Behalf Of Alan Bloom
Sent: Saturday, December 19, 2009 11:56 AM
To: Elecraft_K3@ yahoogroups. com
Subject: RE: [Elecraft_K3] New subject: Modulation monitoring
On Sat, 2009-12-19 at 14:27 -0500, Joe Subich, W4TV wrote:
> > By the way, I hope everyone noticed that the definition of
> > occupied bandwidth is that which contains 99% of the
> > transmitted power. Your 3 dB or 6 dB bandwidth must be quite
> > a bit less than that.
> 1% of transmitted power is the -10 dB level ... not much below
> the 6 dB bandwidth.
Yes, after posting that I thought about it some more. The response of
most crystal filters drops rapidly past the -6 dB point, so the 99%
occupied power bandwidth is probably not much greater than the - 6 dB