I have been experimenting with the Jupiter receiver. Even without the backup battery, I can sometimes get a similar problem. The receiver indicates a 3D lock, but the 10 kHz signal is not stabilized for another 45 seconds. Without the backup battery, 3D lock can take 15 minutes. I experience the long delay even for a power supply interruption. I believe the receiver has to do a cold search. Once the 10 kHz is locked and I disconnect the antenna, the receiver does not report a loss of lock for twenty to thirty seconds. During this time and for an undetermined time later, the 10 kHz signal stays close to 10.000000 kHz. When I restore the antenna, relock takes only seconds and the 10 kHz is quickly relocked with a short glitch. More work will be required to nail down these numbers. With my receiver, the startup 10 kHz frequency is typically 0.030 to 0.070 Hz high. I intend to divide down the 10 kHz output from a Jupiter receiver to drive a General Radio model 1103 Synchronometer (1 kHz) and a General Radio model 1109 comparison oscilloscope having a circular sweep (10 kHz, 1 kHz, and 100 Hz).
John WA4WDL Yorktown, VA ----- Original Message ----- From: "Normand Martel" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, March 07, 2006 8:44 AM Subject: [time-nuts] ...Conexant (Rockwell) Jupiter behaving strangely > Hi... > > I currently use a Conexant (Rockwell) Jupiter GPS > receiver to calibrate a standalone Oscilloquartz B541 > OXCO as a local frequency standard, and, while being > less accurate that a professionnal GPS slaved > frequency standard, it far overmeets my needs. > > The beauty with the Conexant Jupiter is that it > features a GPS precise 10kPPS (10kHz squarewave) > signal, which is by far easier to work with than the > well known 1PPS TIMEMARK found on most GPS receivers. > > My problem with the 10kPPS signal is that it doesn't > lockup at each time the GPS receiver gets a fix if the > backup battery is plugged-in. If i remove the backup > battery, the 10kPPS signal locks-up everytime i cycle > the receiver's power and get a fix. One more thing: > The fix is good regardless of the 10kPPS lock > condition... This screws me up! > > My temporary solution is to use the receiver without > the battery backup, but this gives me a lenghty TTFF > problem: The receiver takes a lot more time to get a > fix if i don't plug-in the battery. Have you worked > with this receiver and the 10 kPPS signal? Is there a > way i could get sure this signal locks-up with the GPS > clocks? > > When the receiver's 10kPPS doesn't lockup, it runs at > 9998.8365 - 9998.8404 PPS, which is far more away than > the initial (turn-on) out-of-lock (10000.02PPS) > condition. > > Thanks for your attention... > > Normand Martel VE2UM > Montreal, Canada > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
