[R-390] DSP IF

[Bob Camp]

Hi

What I'm after is AM that is easy to listen to. I'm not after Hi Fi, or 
AM stereo. All I want to do it tune a station and listen to it with the 
least strain possible.

The SE-3 is a synchronous detector and it works very well with the 
R390. It certainly works better than the other analog synchronous 
detectors I have used. That said it isn't perfect. I think that with 
modern DSP and a bit of listening time (and tweaking and listening) you 
can do better. Certainly with DSP you can "vote" the sidebands by 
octaves. You can also do some stuff to null out heterodynes and other 
junk. You are not going to get Hi FI audio (20 KHz 1 db point) out of 
an R390 with a 16 KC filter in it. I also don't think that many of us 
have stations that are clear channel enough to make something that wide 
practical.

	Take Care

		Bob Camp
		KB8TQ



On Apr 22, 2005, at 4:36 PM, Richard Loken wrote:

> On Fri, 22 Apr 2005, Bob Camp wrote:
>
>> 4) The hidden agenda here is to do a *very* good job on AM processing.
>> I have yet to see a dsp radio that does even a so so job on AM. It
>> would be nice to do it right.
>
> My tastes are much more pedestrian, I want a synchronous detector so I
> can get away from my daily doses of audio distortion brought about by
> fading issues with the carrier and the sidebands.
>
> Always a way to consume time and money.
>
> -- 
>    Richard Loken VE6BSV, Systems Programmer - VMS  : "Anybody can be a 
> father
>    Athabasca University                            :  but you have to 
> earn
>    Athabasca, Alberta Canada                       :  the title of 
> 'daddy'"
>    ** richardlo at admin.athabascau.ca **             :  - Lynn Johnston
>