[time-nuts] WWV/WWVH audio simulator?

DaveH info at blackmountainforge.com
Sun Jan 5 13:53:07 EST 2014


This is by design

The POTS (Plain Old Telephone System) specifies a bandwidth of 300Hz to
3,400Hz. 

http://en.wikipedia.org/wiki/Plain_old_telephone_service

They are trying to cram as many channels into as little bandwidth as
possible and the greater the frequency response they provide, the more
bandwidth it takkes and the fewer channels they can provide.

T1 lines were originally developed to bring 16 voice channels into a
building that didn't have enough copper circuits.

Dave

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Jayson Smith
> Sent: Sunday, January 05, 2014 07:51
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] WWV/WWVH audio simulator?
> 
> Hi,
> 
> Wow, those recordings are very interesting! Late in that 
> series, there's 
> one which sounds like a direct feed of WWVH for a few minutes. This 
> really points out what all is lost by the time the signal 
> gets to air. 
> The phone services aren't much better, since everything above 4KHZ is 
> lost, and at least the WWV phone number (+1 303-499-7111) has 
> some sort 
> of highpass filter on it or something so you don't get the 
> full fidelity 
> of the broadcast, in particular, you don't hear much of the 
> 100HZ timecode.
> Jayson
> 
> On 1/5/2014 2:05 AM, Peter Monta wrote:
> > Hi Jayson,



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