My service monitor (HP 8924C) has both a deviation meter and an oscilloscope to display the demodulated audio. Both the numbers on the dev meter and the peak to peak on the scope read about 15 Khz.
I see another paging system (152.84) that shows the same 15 Khz dev, and a bunch of other ones that show 5 Khz dev. -- Tim :wq On Aug 21, 2010, at 12:18 PM, MCH wrote: > Before you said 15 kHz P-P (IOW bandwidth). Now you're saying 15 kHz > deviation. 15 kHz deviation would be way too high. > > Joe M. > > Tim Sawyer wrote: > > > > > > I haven't noticed a hum. There's more of a scream on it. > > > > It's POCSAG. Is that analog? > > > > The dev is basically 15 Khz but there is, what I going to call splatter > > that is like 30 Khz. > > -- > > Tim > > :wq > > > > On Aug 21, 2010, at 10:14 AM, MCH wrote: > > > >> > >> > >> Many times (but not all), there will be a grungy sound with the spur. > >> Think of a very loud 60 cycle hum. > >> > >> And 15 kHz is higher than normal. I think the typical shift is 5 kHz > >> (+/- 2.5 kHz) if we are talking about digital paging. Analog might be 15 > >> kHz, as the bandwidth limit would be 16 kHz. > >> > >> Joe M. > >> > >> Tim Sawyer wrote: > >> > > >> > > >> > I'm not sure what you mean by grungy. What are you getting at? > >> > -- > >> > Tim > >> > :wq > >> > > >> > On Aug 21, 2010, at 6:59 AM, MCH wrote: > >> > > >> >> Does it have a 'grungy' sound to it when you hear it on your input? > >> > > >> > > >> > > >> > > >> > > > > > > > > > > > > > > ---------------------------------------------------------- > > > > > > Internal Virus Database is out of date. > > Checked by AVG - www.avg.com > > Version: 9.0.783 / Virus Database: 271.1.1/2746 - Release Date: 03/14/10 > > 03:33:00 > > >
