Knowing a litle bit about semiconductor production it is safe to assume that all 7M series divvices have the same chip and during production at ublox some features are disabled or enabled. The result is one mask set one chip run and one inventory. I did see a recent announcement where a 7M can be used as a GPSDO one of the intended markets is micro cell sites.Will require an external XO. In the meantime we have been playing with a $ 15 M7 ublox that can be programmed from 1 pps to 1 KHz and use it in a PLL. I call it a GPS PLL and is mainly intended for Ham's. Clark had years ago a similar circuits we have added some mods. Using a Morion 89 we get better than 1 E-10 per second on first try.. There have been recent claims using 1000 seconds which is easy but this is per second. Next steps are more fine tuning and lower cost XO's. Maybe even a VCTCXO. As I said before intended for Ham's, field day, uwave and SDR. Not really a time nut unit, but low cost off the shelf standard parts and no adjustments all on a 5 X 5 cm board. With a Morion you have to start off with 15 V but there are OCXO's out there for 5 V. Ideal for fieldday 12 V. Bert Kehren In a message dated 8/19/2014 12:20:40 P.M. Eastern Daylight Time, [email protected] writes:
Good day all, On another list to which I subscribe, there has been chatter about the Ublox neo-7M GPS receiver. It seems that the device's configurable timepulse output is configurable from 0.25hz to 10 MHz as well as it's duty cycle and can also be set to be one condition when the GPS is not locked and a different condition when locked (i.e. 1 PPS if not locked, 10KHz when locked). This seems all too good to be true. Sounds like a very simple self-contained GPSDO. I don't know anything more about the device. I have just downloaded the documents and will be spending some time reading them. I am curious if any other list members were aware of this feature of this device and have had any first hand experiences with it. There is another model, the 7N. the 7M uses a simple crystal clock, the 7N a TXCO. Cheers, Graham ve3gtc This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication. Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’ usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’ expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
