[time-nuts] GLONASS receiver

Bob Camp lists at rtty.us
Mon Aug 6 09:44:03 EDT 2012


Hi

Oddly enough CDMA transmitters also have a similar carrier frequency spec.
It's rarely discussed, since the required level of accuracy for the timing
is so much tighter.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Magnus Danielson
Sent: Sunday, August 05, 2012 9:20 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] GLONASS receiver

On 08/06/2012 02:42 AM, Hal Murray wrote:
>
> magnus at rubidium.dyndns.org said:
>> Many cell applications require 50 ppb.
>
> What is the context for that?
>
> I'm not a cell-phone wizard.  I think they have two problem areas:
frequency
> and time.
>
> 50 ppb makes sense for frequency.  It doesn't say anything about time.

GSM and derivates have +/- 50 ppb as frequency requirement, no time 
requirement.

Later derivates add time requirements.

See ETSI and 3GPP specs, as freely available online.

Cheers,
Magnus

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