[Elecraft] re bandwidth select on am mode re K3

[Joe Subich, W4TV]

>     Well, it would have made things a lot simpler had them 
> made the display show 6 khz rather than 3 khz.

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.

  

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Fern Rivard
> Sent: Wednesday, March 26, 2008 4:03 PM
> To: Jim; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] re bandwidth select on am mode re K3
> 
> 
>     Well, it would have made things a lot simpler had them 
> made the display show 6 khz rather than 3 khz.   Fern
> 
> 
> ----- Original Message ----- 
> From: "Jim" <ke4wy at zoomtown.com>
> To: <elecraft at mailman.qth.net>
> Sent: Wednesday, March 26, 2008 1:04 PM
> Subject: RE: [Elecraft] re bandwidth select on am mode re K3
> 
> 
> So to make everyone happy a simple way to explain is 3.00 = 6.00 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joe 
> Subich, W4TV
> Sent: Wednesday, March 26, 2008 3:00 PM
> To: 'Dave G4AON'; elecraft at mailman.qth.net
> Subject: RE: [Elecraft] re bandwidth select on am mode re K3
> 
> 
> > I also think it's confusing and should show the overall
> > bandwidth, i.e. 6 KHz like it does on SSB when you have the 
> AM filter 
> > available.
> 
> As Wayne has repeatedly stated, the K3 shows the audio bandwidth - 
> not the RF bandwidth.  Since the AM mode does not support VSB 
> (vestigial side band) or ISB (independent side band) the reporting 
> is consistent.  
> 
> I would very much like to see the K3 support VSB-U and VSB-L (offset 
> the display/carrier to the lower/upper -6dB points of the filter 
> respectively and demodulate only the one sideband).  That provide 
> enhanced fidelity and the opportunity to eliminate QRM from one 
> side or the other.  With DSP demodulation it should be relatively 
> easy to implement. 
> 
> 73, 
> 
>    ... Joe, W4TV 
>   
> 
> 
> > -----Original Message-----
> > From: elecraft-bounces at mailman.qth.net
> > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Dave G4AON
> > Sent: Wednesday, March 26, 2008 1:35 PM
> > To: elecraft at mailman.qth.net
> > Subject: [Elecraft] re bandwidth select on am mode re K3
> > 
> > 
> > It's been noted previously, with the excuse that 3 KHz is the upper
> > audio limit. I also think it's confusing and should show 
> the overall 
> > bandwidth, i.e. 6 KHz like it does on SSB when you have the 
> AM filter 
> > available.
> > 
> > 73 Dave, G4AON
> > K3/100 #80
> > -------------------
> > On my K3, on ssb mode, I can select the wide am filter
> > position but if I 
> > go to the AM mode, the widest bandwidth shown on the display 
> > is 3 khz! 
> > Should it not go to 6 khz as I do have that filter installed and it 
> > works on the ssb and other modes except for the AM mode. Any 
> > clarification or help with this would be greatly appreciated.
> > Thanks from Fern
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