Re: [time-nuts] Z3815A Internal SMA 10Mhz Output
Every GPSDO has only one 10MHz signal: the one coming from the OCXO. If there are many outputs they must always be the same. When the GPS has the 3D fix (or the position hold) and the algorithm has synchronized the OCXO, the 10MHz can be said locked but, when speaking about GPSDO, the correct word should be disciplined. Yes, maybe there are NCOs and/or synthesizers to put out different synchronized frequencies and signals based on the OCXO 10MHz. On Tue, Aug 21, 2012 at 1:14 AM, Jerry jster...@att.net wrote: In ZL1BPU's GPSR-A User Manual, it mentions that there are internal points that provide access to regenerated system 1pps, 10MHz and 19.6608MHz square wave signals which are present even before the system is locked. After GPZ lock is the internal 10Mhz SMA connector output identical to 10MHz sine wave reference available from the rear coaxial connector block? Jerry K1JOS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815A Internal SMA 10Mhz Output
Not every GPSDO has a 10MHz OCXO. 5MHz is, or was, quite common, and I've come across at least one GPSDO with a 10MHz output that I assumed would use a 10MHz OCXO but that also turned out to be based on a 5MHz unit. Then there's the variant of the Trak Microwave 8821B, as just one example, that uses a 16.384MHz OCXO from which they derive a 2.048MHz output without 10MHz anywhere in sight. When I bought one of those a few years ago I assumed that all 8821Bs would be 10MHz GPSDOs, or some nice round figure anyway, and it never even occured to me to ask whether it might be otherwise, which in this particular instance turned out to be a rather expensive mistake:-) regards Nigel GM8PZR In a message dated 21/08/2012 09:39:09 GMT Daylight Time, azelio.bori...@screen.it writes: Every GPSDO has only one 10MHz signal: the one coming from the OCXO. If there are many outputs they must always be the same. When the GPS has the 3D fix (or the position hold) and the algorithm has synchronized the OCXO, the 10MHz can be said locked but, when speaking about GPSDO, the correct word should be disciplined. Yes, maybe there are NCOs and/or synthesizers to put out different synchronized frequencies and signals based on the OCXO 10MHz. On Tue, Aug 21, 2012 at 1:14 AM, Jerry jster...@att.net wrote: In ZL1BPU's GPSR-A User Manual, it mentions that there are internal points that provide access to regenerated system 1pps, 10MHz and 19.6608MHz square wave signals which are present even before the system is locked. After GPZ lock is the internal 10Mhz SMA connector output identical to 10MHz sine wave reference available from the rear coaxial connector block? Jerry K1JOS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Z3815A Internal SMA 10Mhz Output
Not every GPSDO has a 10MHz OCXO. That is certainly true although from a time-nuts point of view, 10Mhz is certainly a very nice number. I have linked to a photo of both sides of a Trimble 1.5x5 GPSDO built about 2008 that has a 1 square Trimble branded OXCO that has a 76.80Mhz as well as a 1PPS output. It requires 3.3VDC for power. http://i906.photobucket.com/albums/ac262/rjb1998/Trimble76_80.jpg -Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815A Internal SMA 10Mhz Output
10MHz would have certainly been more useful to me as a reference source for test gear, my original intention, than the 2.048MHz I ended up with. Nice easy divide down to 1or 2 KHz though, if only I could find a use for that:-) Those photos are of a Trimble Mini-T, I didn't realise they did those with anything other than 10MHz oscillators either! regards Nigel GM8PZR In a message dated 21/08/2012 14:01:00 GMT Daylight Time, golgarfrinc...@yahoo.com writes: That is certainly true although from a time-nuts point of view, 10Mhz is certainly a very nice number. I have linked to a photo of both sides of a Trimble 1.5x5 GPSDO built about 2008 that has a 1 square Trimble branded OXCO that has a 76.80Mhz as well as a 1PPS output. It requires 3.3VDC for power. http://i906.photobucket.com/albums/ac262/rjb1998/Trimble76_80.jpg ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815A Internal SMA 10Mhz Output
Nigel, you can easily divide the 16.384MHz by 16.384 (2^14) to get 1 kHz for phase locking a 10 MHz oscillator with your GPS box. Adrian gandal...@aol.com schrieb: Not every GPSDO has a 10MHz OCXO. 5MHz is, or was, quite common, and I've come across at least one GPSDO with a 10MHz output that I assumed would use a 10MHz OCXO but that also turned out to be based on a 5MHz unit. Then there's the variant of the Trak Microwave 8821B, as just one example, that uses a 16.384MHz OCXO from which they derive a 2.048MHz output without 10MHz anywhere in sight. When I bought one of those a few years ago I assumed that all 8821Bs would be 10MHz GPSDOs, or some nice round figure anyway, and it never even occured to me to ask whether it might be otherwise, which in this particular instance turned out to be a rather expensive mistake:-) regards Nigel GM8PZR In a message dated 21/08/2012 09:39:09 GMT Daylight Time, azelio.bori...@screen.it writes: Every GPSDO has only one 10MHz signal: the one coming from the OCXO. If there are many outputs they must always be the same. When the GPS has the 3D fix (or the position hold) and the algorithm has synchronized the OCXO, the 10MHz can be said locked but, when speaking about GPSDO, the correct word should be disciplined. Yes, maybe there are NCOs and/or synthesizers to put out different synchronized frequencies and signals based on the OCXO 10MHz. On Tue, Aug 21, 2012 at 1:14 AM, Jerry jster...@att.net wrote: In ZL1BPU's GPSR-A User Manual, it mentions that there are internal points that provide access to regenerated system 1pps, 10MHz and 19.6608MHz square wave signals which are present even before the system is locked. After GPZ lock is the internal 10Mhz SMA connector output identical to 10MHz sine wave reference available from the rear coaxial connector block? Jerry K1JOS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815A Internal SMA 10Mhz Output
Not necessary in the Z3815A: it has already a 10MHz output. There are 3 SMB connectors near the rear connector, they are labelled so it should be easy for you to locate the 10MHz and the PPS output. Now I can't open my Z3815A to help, it is in use but from the picture found in Internet I see that the SMB have labels. http://www.vk3hz.net/riglock/VK3II_FT-736_Rig_Locking.pdf It seems (the picture is a little blurry) that the 10MHz output is the central SMB and the 1PPS is the one near the card edge. Then there is a SMB near the Furuno GPS unit but I can't decode from the picture what it is for. On Tue, Aug 21, 2012 at 4:11 PM, Adrian rfn...@arcor.de wrote: Nigel, you can easily divide the 16.384MHz by 16.384 (2^14) to get 1 kHz for phase locking a 10 MHz oscillator with your GPS box. Adrian gandal...@aol.com schrieb: Not every GPSDO has a 10MHz OCXO. 5MHz is, or was, quite common, and I've come across at least one GPSDO with a 10MHz output that I assumed would use a 10MHz OCXO but that also turned out to be based on a 5MHz unit. Then there's the variant of the Trak Microwave 8821B, as just one example, that uses a 16.384MHz OCXO from which they derive a 2.048MHz output without 10MHz anywhere in sight. When I bought one of those a few years ago I assumed that all 8821Bs would be 10MHz GPSDOs, or some nice round figure anyway, and it never even occured to me to ask whether it might be otherwise, which in this particular instance turned out to be a rather expensive mistake:-) regards Nigel GM8PZR In a message dated 21/08/2012 09:39:09 GMT Daylight Time, azelio.bori...@screen.it writes: Every GPSDO has only one 10MHz signal: the one coming from the OCXO. If there are many outputs they must always be the same. When the GPS has the 3D fix (or the position hold) and the algorithm has synchronized the OCXO, the 10MHz can be said locked but, when speaking about GPSDO, the correct word should be disciplined. Yes, maybe there are NCOs and/or synthesizers to put out different synchronized frequencies and signals based on the OCXO 10MHz. On Tue, Aug 21, 2012 at 1:14 AM, Jerry jster...@att.net wrote: In ZL1BPU's GPSR-A User Manual, it mentions that there are internal points that provide access to regenerated system 1pps, 10MHz and 19.6608MHz square wave signals which are present even before the system is locked. After GPZ lock is the internal 10Mhz SMA connector output identical to 10MHz sine wave reference available from the rear coaxial connector block? Jerry K1JOS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815A Internal SMA 10Mhz Output
Hi Adrian Yes, I decided that too and may well try it sometime, although it's quite well down the to do pile right now, and it's even made slightly easier as it's already divided down internally to 2.048MHz:-) Ironically, when I bought the Trak unit I already had a 2.048MHz master oscillator system using two ovened crystal oscillators in an auto switchover arrangement, plus the distribution amplifier to match, and I've never found very much use for those either:-) Regards Nigel GM8PZR In a message dated 21/08/2012 15:12:07 GMT Daylight Time, rfn...@arcor.de writes: Nigel, you can easily divide the 16.384MHz by 16.384 (2^14) to get 1 kHz for phase locking a 10 MHz oscillator with your GPS box. Adrian gandal...@aol.com schrieb: Not every GPSDO has a 10MHz OCXO. 5MHz is, or was, quite common, and I've come across at least one GPSDO with a 10MHz output that I assumed would use a 10MHz OCXO but that also turned out to be based on a 5MHz unit. Then there's the variant of the Trak Microwave 8821B, as just one example, that uses a 16.384MHz OCXO from which they derive a 2.048MHz output without 10MHz anywhere in sight. When I bought one of those a few years ago I assumed that all 8821Bs would be 10MHz GPSDOs, or some nice round figure anyway, and it never even occured to me to ask whether it might be otherwise, which in this particular instance turned out to be a rather expensive mistake:-) regards Nigel GM8PZR In a message dated 21/08/2012 09:39:09 GMT Daylight Time, azelio.bori...@screen.it writes: Every GPSDO has only one 10MHz signal: the one coming from the OCXO. If there are many outputs they must always be the same. When the GPS has the 3D fix (or the position hold) and the algorithm has synchronized the OCXO, the 10MHz can be said locked but, when speaking about GPSDO, the correct word should be disciplined. Yes, maybe there are NCOs and/or synthesizers to put out different synchronized frequencies and signals based on the OCXO 10MHz. On Tue, Aug 21, 2012 at 1:14 AM, Jerry jster...@att.net wrote: In ZL1BPU's GPSR-A User Manual, it mentions that there are internal points that provide access to regenerated system 1pps, 10MHz and 19.6608MHz square wave signals which are present even before the system is locked. After GPZ lock is the internal 10Mhz SMA connector output identical to 10MHz sine wave reference available from the rear coaxial connector block? Jerry K1JOS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3815A Internal SMA 10Mhz Output
Hi Nigel, Then there's the variant of the Trak Microwave 8821B, as just one example, that uses a 16.384MHz OCXO from which they derive a 2.048MHz output without 10MHz anywhere in sight. When I bought one of those a few years ago I assumed that all 8821Bs would be 10MHz GPSDOs, or some nice round figure anyway, and it never even occured to me to ask whether it might be otherwise, which in this particular instance turned out to be a rather expensive mistake:-) Have one of those Trak 8821B too. It is a bit interesting since the Motorola Oncore VP inside mine has the Z option (phase measurement). -- Björn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Z3815A Internal SMA 10Mhz Output
In ZL1BPU's GPSR-A User Manual, it mentions that there are internal points that provide access to regenerated system 1pps, 10MHz and 19.6608MHz square wave signals which are present even before the system is locked. After GPZ lock is the internal 10Mhz SMA connector output identical to 10MHz sine wave reference available from the rear coaxial connector block? Jerry K1JOS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
