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[time-freq] RefLock II behavior

Luis Cupido cupido at mail.ua.pt
Thu Jun 22 21:36:10 UTC 2006

MessageThe actual counter values are available on the reflock II spi interface.

Steven, could you provide Michael a way to record the lag counter values over time,
is your SPI hardware ready?

Luis Cupido.

  ----- Original Message ----- 
  From: Steven Bible 
  To: TAPR time and frequency projects 
  Sent: Thursday, June 22, 2006 9:32 PM
  Subject: RE: [time-freq] RefLock II behavior

  Hi Mike,

  Perhaps as a diagnostic suggestion, can you record the VTUNE voltage?  Then compare that with the frequency output.  This might help us understand the VCXO a little and maybe give us a clue.

  - Steve N7HPR

    -----Original Message----- 
    From: "Owen, Michael" 
    Sent: Jun 22, 2006 8:06 AM 
    To: TAPR time and frequency projects 
    Subject: RE: [time-freq] RefLock II behavior 

    Dear friends,

    I'm still stuck with way too much 100 MHz oscillator hunting.  To eliminate the GPS 1PPS waveform as a possible source, I changed receivers to a Trimble Resolution-T.  To eliminate mis-assembly of the RefLock II, I am using unit #2 programmed with r2_enhpps_30_1.  Here is the result:

    In the graph, samples were taken every second after everything had run for an hour.  The system appears to be hunting +0.3Hz to -0.1 Hz with occasional spikes. 

    f_conf = 00 (0-ohm jumpers @ N1 & N2)
    avg_conf = 00 (jumpers @ N4 & N8)
    pps_pol = 0 (jumper @ N2048)
    ld_conf = 5 (jumpers @ R1,R3, R4, R5)

    If you have any suggestions, please share 'em with me.
    Michael R. Owen, Ph.D.
    Senior System Engineer
    Sensis Corporation
    (315) 634-3066

\r\n- Steve\r\n  (n7hpr at tapr.org)\r\n


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