[Elecraft] Question about filters in USB as shown on a P3

[Tom]

Just when I thought I had it all together I had this observation:
For am, the bandwidth as shown on the k3 or kx3 says 3 with a shift of 1.5.
However when you look at the p3 the band is clearly centered on the carrier but the band you see is 6khz wide. Shouldn't the bandwidth be shown as 6khz with a center frequency of 0??
Does anyone. Have a an explanation?
73s Tom

-------- Original message --------
From: Tom <tomb18 at videotron.ca> 
Date: 04/11/2013  18:24  (GMT-05:00) 
To: bill conkling <nr4c at widomaker.com> 
Subject: Re: [Elecraft] Question about filters in USB as shown on a P3 
 
Nope
Check it out today in detail. The filters are centered at the center frequency of the audio passband which for USB is above the carrier frequency and for LSB is below. Gets a bit more complex with all the data modes but its the same idea.
73s Tom