[TenTec] Scads of used Icom IC-7300

[Gary J FollettDukes HiFi]

Thank you for at least suggesting that there might be an answer.

Even so, 20 to 30 dB over 96 is not enough, that’s still only 128 dB, and a good analog receiver can be better than that.

Good luck with your articles. I am asking for a lifetime membership for this Christmas. Then I can read more current technical info since I am retiring from any regular work in 14 months.

73

Gary


> On Sep 11, 2016, at 4:21 PM, Jim Brown <k9yc at audiosystemsgroup.com> wrote:
> 
> On Sun,9/11/2016 2:04 PM, Gary J FollettDukes HiFi wrote:
>> I understand and appreciate this discussion of NOISE dynamic range. This does not explain how one can get SIGNAL dynamic range higher than ~96 dB with 16 bits. These are different quantities.
>> 
>> If the A to D has say, 1 mV per bit response, then the largest input signal this 16 bit A to D can measure should be ~65,000 mV. That’s about 96 dB.
> 
> Hi Gary,
> 
> I worked in pro audio, and thought the same thing you have stated here. But there's far more to it than that -- it's not a simple A/D, it's a far more complex (and very different) circuit. My neighbor NR0V, who developed the "Pure Signal" distortion cancelling system, went through it with me. I'm not a digital guy, so I don't remember details. But the bottom line is that these systems get another 20-30 dB more dynamic range than for a simple A/D. I'm sure that if we had time, you or I could learn a lot about it by poking around the internet. :) Someday I probably will, but my plate is currently full working on an update for several chapters of the ARRL Handbook. And when I finish with that, I'm sure the XYL will have something for me to do. :)
> 
> 73, Jim K9YC
> 
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