[Repeater-Builder] Re: Narrowband Range -was- Seeking emergency system design help

[wb6dgn]

Also, wouldn't Carson's rule mitigate that characteristic?

--- In Repeater-Builder@yahoogroups.com, MCH <m...@...> wrote:
>
> I would agree with the quality issues, but does that really equate to 
> unintelligibility on any significant scale?
> 
> Joe M.
> 
> Matthew Kaufman wrote:
> >   On 8/27/2010 8:18 PM, wb6dgn wrote:
> >> If you reduce the modulation without reducing the receiver bandwidth, 
> >> then, yes, the range will be reduced.  You have reduced the signal without 
> >> also reducing the noise.  However, if you reduce the modulation and, at 
> >> the same time, reduce the receiver bandwidth and audio recovery, by a like 
> >> amount, then I do not see how the signal:noise ratio, and therefore range, 
> >> would change appreciably.
> > Relationships aren't linear, or you'd be right. Reducing the modulation 
> > index and simultaneously reducing the receiver bandwidth from 5 to 2.5 
> > kHz results in a situation which requires ~6 db more signal level for 
> > the same demodulated quality (ex. 12db SINAD)
> > 
> > Matthew Kaufman
> > 
> > 
> > 
> > ------------------------------------
> > 
> > 
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> >
>