[R-390] Filters

[Bob Camp]

Hi

Thus the variety of outboard dsp filter boxes that have shown up over the years. Once you get them into production, the cost is high enough that there is a very limited audience. 

Bob

On Feb 15, 2013, at 8:50 PM, mlmccauley at att.net wrote:

> 
> A DSP filter would be an ideal replacement for a mechanical.
> 
> DSP chips that work at 455KHz are readily available for very reasonable $.
> 
> The problem is the software.  To do a nice, flat topped, steep skirt filter would not be a trivial piece of work.
> 
> The upside is that one relatively simple circuit could be made to do everything from super-narrow CW to full bandwidth AM SWL.
> 
> 73,
> 
> Mike, WB5MYY
> 
> 
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