In simple terms, a narrower receiver bandwidth will yield a greater sensitivity when measuring signal strength with a signal generator. (less noise power present in passband)
The narrower the bandwidth of transmitter and receiver the less noise rejection (environment) you have. With narrow band it starts to approach AM in regards to noise rejection. Narrow bandwidth modulation has less power in the sidebands 73 Gary K4FMX > -----Original Message----- > From: [email protected] [mailto:Repeater- > [email protected]] On Behalf Of MCH > Sent: Friday, October 02, 2009 7:54 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Re: Lower deviation = less range??? Sounds > like bull to me. (was ARRL...) > > So you're saying the signal is more affected by multipath or fading? I > find that hard to believe, too, since that again implies that the tail > on a repeater would be similarly affected (being the extreme case of > lower deviation), and I've never seen the signal change on the tail vs a > modulated transmission. I've also never noticed multipath effects more > on a tail than a repeated transmission. > > Or is it that there is less 'tolerance' for distortion of the audio > signal? Sort of "it's easier to disrupt a lower bandwidth signal than a > higher bandwidth one"??? > > Well, regardless, I've never seen any signal effects based on the level > of deviation. Readability? Maybe. Range? Never. > > Joe M. > > nj902 wrote: > > Lower deviation = less range? Lower deviation = "more punch"? > > > > Actually both are correct. > > > > The static [bench-test] performance of narrowband radios often shows > some S/N improvement vs. wideband, however, there is more to > intelligibility [DAQ] than a simple bench test indicates. > > > > The signal dynamics of a multi-path, faded, real world coverage > environment are what causes the degradation of the narrowband analog > format compared to wideband analog. > > > > A study of TSB-88 is highly recommended for those who want additional > details. > > > > ----------------------------------------------------------------- > > > > --- In [email protected], MCH <m...@...> wrote: > >> I'm having a hard time understanding this. > >> > >> If you have the same format signal (analog), and you reduce the > >> deviation by half, how is that reducing the range? > > > > > > > > > > ------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > > > ------------------------------------------------------------------------ > > > > > > Internal Virus Database is out of date. > > Checked by AVG - www.avg.com > > Version: 8.5.387 / Virus Database: 270.13.38/2274 - Release Date: > 07/31/09 05:58:00 > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
