Description
■ A GPS disciplined OCXO incorporating sync to a 1pps input and
   1pps output with 1.5µs holdover stability achieved by using an
   adaptive algorithm. Current internal parameters of the algorithm
   are available to the user via Tx and Rx commands.
■ Model IQCM-200
■ Model Issue number 1
■ Application Information (Reference Drawing):
   Connect the 1PPS output of your GPS system to the
   IQCM-200. A MCU can be used to monitor the working state of
   the IQCM-200.
■ Working States (Reference Drawing):
   Run1: Fast track. Adjust the OCXO 10MHz output frequency
   quickly to track the 1PPS to 10MHz with 1PPS reference.
   Run2: Slow track. Adjust the OCXO 10MHz output frequency
   slowly when phase error is in the defined range.
   Holdover: No 1PPS input present; an algorithm enables
   adaptive modelling of the frequency stability of an OCXO with
   reference to the GPS timing signal.
   Free Run: Clock module powered up with no 1PPS input.
■ Note1: The IQCM-200 should be left powered and running for 7
   days minimum before operation to allow for the OCXOs
   internal drift to stabilise.
   Note2: The adaptive module algorithm can be built after two
   days operation with good GPS signal, however this data will be
   lost at power down.
   Note3: When State input (Pin 8) is set low the IQCM-200 will
   operate in Holdover mode regardless of the 1PPS signal
   condition.
■ Output Data Word Example:
   $PDP,00,0,F,Q,-3095,32768.0000,32768.0000,000,000,00000.
   0000,00000.0000,00000.0000,00000.0000,3-23,+000.0000,-00
   00,www.iqdfp.com,1.1,2011-05-16*55