re [Elecraft] bandwidth select on am mode re K3

[Joe Subich, W4TV]

> In response to popular demand, we're going to increase the AM 
> b/w display 2X to match the IF b/w in the next K3 s/w 
> release. :-)  So for the 6 kHz AM filter it will display 6 
> kHz max instead of 3 kHz. 

Of course, the next set of complaints will be "My filter display 
says 6 KHz, why is my AM audio response so narrow?  On every other 
mode it shows me the high/low cut frequencies." 




> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of ERic - WA6HHQ
> Sent: Thursday, March 27, 2008 1:57 PM
> To: elecraft at mailman.qth.net
> Subject: RE: re [Elecraft] bandwidth select on am mode re K3
> 
> 
> 
> We actually have -both- IF and AF DSP filtering in tandem in 
> the K3 for best performance. The confusion came about because 
> we chose to display the audio b/w, which is 1/2 of the IF b/w 
> for AM. (2 identical sidebands in AM.)  Of course in SSB the 
> IF b/w and the Audio b/w are the same since SSB only has one 
> sideband, so there was no confusion there. 
> 
> In response to popular demand, we're going to increase the AM 
> b/w display 2X to match the IF b/w in the next K3 s/w 
> release. :-)  So for the 6 kHz AM filter it will display 6 
> kHz max instead of 3 kHz. 
> 
> 73, Eric   WA6HHQ
> ----
> 
> 
> G4ILO wrote:
> > 
> > 
> > Joe Subich, W4TV-3 wrote:
> >> 
> >> But it's not 6 KHz ... it's 3 KHz audio bandwidth and that is 
> >> what is shown on the display.   The DSP bandwidth is not the 
> >> same as the RF/roofing filter bandwidth.
> >> 
> > But it's 6KHz of RF that the signal is decoded from. 6KHz worth of 
> > band noise and QRM will be present.
> > 
> > I'm not even sure you're correct in saying the DSP 
> bandwidth is 3KHz. 
> > This is IF DSP, isn't it, not AF DSP as in the K2?
> > 
> 
> -- 
> View this message in context: 
> http://www.nabble.com/re-bandwidth-select-on-am-mode-re-K3-tp1
6310886p16329491.html
Sent from the Elecraft mailing list archive at Nabble.com.

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