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[time-freq] More Data

Luis Cupido cupido at mail.ua.pt
Thu Sep 7 10:35:08 UTC 2006

Hi Bobby,

Sorry for the delay in the reply (was out of town).
Any findings/developments in the mean time.

Could you use a signal generator for 10MHz
to place yourself easily above and below 10MHz
to inspect the behavior of the circuit ?

Luis Cupido

  ----- Original Message ----- 
  From: ba at bobby.net 
  To: time-freq at lists.tapr.org 
  Sent: Wednesday, August 30, 2006 5:57 PM
  Subject: [time-freq] More Data

  Hi Luis,

  I changed my configuration bits to those Steve suggested, 0 at N1,2,4,8, 2048.

  There was some change, tune voltage wandered up or down depending on phase 
  detector polarity chosen. 

  I left the setup running overnight and this morning foound the leds on steady,
  at least for the few minutes I was willing to stand and watch. I put a scope on the
  tuning voltage port and observed it was at or near 0V. After another minute or so
  there was an approx 2v jump that settled back to 0V in a few seconds, then 
  2V jump again about 20 seconds later which again settled to 0v. After that the jumps
  became more frequent and larger until it was as erratic has it had been the night 

  This entire time the counter indicated 10,000,000, with an occasional 9,999,999
  with no correllation to the leds. The leds seem to light only when the tune 
  voltage is at or near 0V (50 to 100mv of approx 10 MHz noise).

  Any thoughts ?

  73 Bobby


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