Re: [Discuss-gnuradio] NBFM

[Eric Blossom]

On Fri, Feb 18, 2005 at 05:42:03AM -0000, Robert McGwier wrote:
> In a really good NBFM receiver,  where you are attempting to use it
> for voice communications, and hand helds are involved (say), it is
> important to have threshold effect improvement.  This will improve
> intelligibility on important links such as official/government
> communications.  This is done by using a PLL based demodulator.
> If you use a PLL based demodulator, it is better to use carrier
> detect for squelch than the high freq/low freq filter based
> squelch or in addition to it.  I usually do primary/secondary
> tests such
> 
> if  (signal strength> threshold) should_do_squelch = secondary_test(signal);
> In addition, most commercial NBFM transmitter have a fair amount of
> preemphasis and it is important to do deemphasis.

Thanks for posting all the great links!

Eric