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
> 
> 
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