[TenTec] Re: [Ten-Tec] Alas, not for me

[Ken Brown]

John Rippey wrote:

>
> E. Alternatively, it's possible to modify a TS-870S by shoe-horning 
> INRAD filters in place of the stock 2d and 3d IF filters, and this 
> produces a radio with pretty good dynamic range.

Excuse me John, but this sounds wrong to me. The dynamic range is 
limited by the analog to digital converter. Narrowing the bandpass that 
the ADC sees does not increase it's dynamic range, although it may 
decrease the need for a large a dynamic range. So then what was not good 
enough may then become pretty good. Still the dynamic range is the same. 
If the little signal you are trying to copy and the big signal you want 
to reject are both inside the (narrower than stock) roofing filter 
bandwidth, your ability to separate them is still limited by the dynamic 
range of the ADC. Since with a narrower roofing filter you have less 
total power to digitize, you can get away with a smaller dynamic range a 
lot of the time.

DE N6KB