[time-nuts] Re: Austron Oscillator Products

[Bob Camp]

Hi

If you dig around with Google, there are other similar parts at various “random” frequencies in the 50 to 55 MHz range. Best guess is that these went into something other than a GSM ( = fixed clock ) sort of system. The other minor gotcha in terms of GSM is that they shipped a bit before GSM was “invented”  :) :). 

Bob

> On Feb 28, 2024, at 7:02 AM, john.haine--- via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 52MHz might have been made for GSM base stations.  The GSM numerology works
> out based on a 13MHz oscillator being needed in a handset to generate all
> the clock frequencies required.  In a base site a higher frequency could be
> useful for the more complex signal processing needed.  IIRC my GSM days
> 13MHz VCTCXOs were common for handsets - frequency would be locked to
> incoming downlink through the "F bursts" so a relaxed spec could be used
> (1ppm IIRC).  With GSM precise locking between base stations wasn't so
> critical, whereas with CDMA using soft handover and more recent standards it
> becomes essential hence the use of GPS.
> 
> -	John
> 
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