Hi Serg, > Would like to share some experience trying to calibrate VCXO. I ran the > manual process with CMU200 and everything went okay, just like Mychaela > described. I got different numbers but within the same range and with > similar trend.
Good! > However an attempt to go against the live network did not > work, the network was starting LUP and apparently could not decode bursts. What do you mean by the network starting LUP? The Location Update procedure is initiated by the MS when it finds a good cell, not by the network - the process starts with the MS sending a RACH to which the network will reply with an Immediate Assignment. Are you getting to the point where the MS is sending out a RACH after having locked onto the right cell in your area? Does the RACH seem to be then ignored by the network, leading you to the conclusion that the network is unable to decode the bursts sent by the MS? Or are you getting as far as the dedicated channel establishment for the LUP, and then getting some behavior that seems like bursts not being decoded correctly? Do you have an rvinterf log that you can share? (Remember, no mail attachments on this list, please post a link instead.) > So far I stopped any further attempts and will study CMU200 procedures how > to setup proper BS simulation. If you do this part, you will be ahead of me, as I haven't exercised the CMU200's GSM signaling modes yet, only non-signaling. > The unit I acquired seems to be in good working order and I have 10 MHz > GPSDO connected to it as an external reference. Just curious, is your GPSDO a Trimble Thunderbolt? I used to be on the time-nuts list, and the Thunderbolt was everyone's favorite GPSDO. I don't have a GPSDO setup currently (I do have a Thunderbolt unit, but no outdoor GPS antenna setup), so I'm running my CMU200 with its internal timing reference. But my unit does have the better of the two OCXO options (called B12 IIRC), so I think it's probably good enough. M~ _______________________________________________ Community mailing list Community@freecalypso.org https://www.freecalypso.org/mailman/listinfo/community