The poster who made that request has made it before.
Actually, the width of the transmitted signal should be controlled in 
the DSP, so Joe does have a point, but the designers at Elecraft are not 
ready to let go of the bandwidth "safety net" provided by the 6 kHz filter.
Other SDR transmitters can generate AM and ESSB (and FM too) with no 
roofing filters at all, so it is possible to control the width using 
only the DSP.

73,
Don W3FPR

On 9/21/2012 5:21 PM, Al Lorona wrote:
> I don't know the motivation for the FM filter request, but I will say that 
> here
> in the US there are vast expanses of the bands that are mostly unused. For
> instance, night after night there isn't a single station between 3600 and 3700
> kHz here on the west coast. As another data point, I just counted the number 
> of
> stations currently operating between 28300 and 28500 kHz: a total of 4. Under
> conditions like these I see no harm in allowing the ESSB stations to
> experiment.
>

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