Hello, Subject line pretty much says it all. I am using a newly-resurrected 58503A and noticed some unpopulated SMC connector pads on the motherboard next to the 1 PPS and the Alarm Output jacks. Curious if one of these might be an IRIG-B output (or some other useful signal)? Thanks, Stan

I would be grateful for an answer to this question, as I also have a an HP 58503 - is the manual for the instrument available for download ? Thank you Roy -----Original Message----- From: Stan Sent: Sunday, January 08, 2017 11:18 PM To: time-nuts@febo.com Subject: [time-nuts] What signals if any are on the unpopulated SMC pads onthe 58503A motherboard? Hello, Subject line pretty much says it all. I am using a newly-resurrected 58503A and noticed some unpopulated SMC connector pads on the motherboard next to the 1 PPS and the Alarm Output jacks. Curious if one of these might be an IRIG-B output (or some other useful signal)? Thanks, Stan _______________________________________________ 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. ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.7996 / Virus Database: 4749/13729 - Release Date: 01/08/17

On 9 January 2017 at 10:44, Roy Phillips <phill.r1@btinternet.com> wrote: > I would be grateful for an answer to this question, as I also have a an HP > 58503 - is the manual for the instrument available for download ? > Thank you > Roy > I know its a bit unlikely to use SMC in such a case, but I believe there are some versions of the 58503A which have a clock, and perhaps some buttons on the front. I would have expected them to be via a multi-way cable, but maybe not. There are at least two relevant manuals on Tom's website http://www.leapsecond.com/museum/hp59551a/097-59551-02-iss-1.pdf http://www.leapsecond.com/museum/hp58503a/097-58503-08-iss-1.pdf I also have another one - not sure where I got that from. It might have been on Tom's site too, but if not, I put a copy here. http://www.kirkbymicrowave.co.uk/58503B-GPS-disiplined-OCXO-frequency-standard-097-58503-13-iss-1.pdf

David Many thanks for your help, I have downloaded all three items, my 58503 is an A, I had no idea that a B model existed ! Mine has the front panel display, which is very bright suggesting that it had not been used for very long periods. The unit was in overall VG condition when I received it (costa plenty!) , and I have reason to believe it was used as a portable survey tool. Internally there is a panel to the rear that has a number of SMC connectors, and just one is used to provide the 1 pps jumper lead to a BNC at the rear (external) panel. It would be interesting to know what the other SMC connectors where for ?? Am I to assume that no Service/Technical manual is available ? Mine has the HP SmartClock Technology sticker on the front panel - what exactly does this mean ? Regards Roy -----Original Message----- From: Dr. David Kirkby (Kirkby Microwave Ltd) Sent: Monday, January 09, 2017 11:42 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] What signals if any are on the unpopulated SMC pads onthe 58503A motherboard? On 9 January 2017 at 10:44, Roy Phillips <phill.r1@btinternet.com> wrote: > I would be grateful for an answer to this question, as I also have a an HP > 58503 - is the manual for the instrument available for download ? > Thank you > Roy > I know its a bit unlikely to use SMC in such a case, but I believe there are some versions of the 58503A which have a clock, and perhaps some buttons on the front. I would have expected them to be via a multi-way cable, but maybe not. There are at least two relevant manuals on Tom's website http://www.leapsecond.com/museum/hp59551a/097-59551-02-iss-1.pdf http://www.leapsecond.com/museum/hp58503a/097-58503-08-iss-1.pdf I also have another one - not sure where I got that from. It might have been on Tom's site too, but if not, I put a copy here. http://www.kirkbymicrowave.co.uk/58503B-GPS-disiplined-OCXO-frequency-standard-097-58503-13-iss-1.pdf _______________________________________________ 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. ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.7996 / Virus Database: 4749/13735 - Release Date: 01/09/17