piclist 2002\08\14\221006a >
Thread: What Test Gear to measure xtal frequency to 1Hz
www.piclist.com/techref/timers.htm?key=xtal
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face BY : Jim email (remove spam text)



(To the list this time!)

  "Almost every cellphone contains a TXCO"

This solution is trivial anymore since the
advent of the microprocessor (MEASURE the
ambient temperature, do a look-up in a table
BASED on that particular crystal's "curve"
(see Peter's postings) and feed a DC voltage
to a vari-cap diode incorporated in the
crystal oscillator's circuit!) - OR -

- anymore it's a real easy matter to 'slave' the
cell phone's frequency from transmissions coming
on the "downlink" side (from the base station).

Heck - the Ericsson RBS882 BS (base station) gear
was synchonized to the 1.544 MBit/Sec "T-span"
coming from the MTSO (mobile telephone switching
office) where all the 'clocking' on those spans
is derived from very accurate sources (a higher
tier point from somewhere else in the network)!

RF (and telco) Jim



{Original Message removed}
<00e001c24400$78f1da80$0100a8c0@piii500a> 7bit

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Subject (change) What Test Gear to measure xtal frequency to 1Hz

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