Charles When I made the offer for the unit, I took the chance that it might be, I saw that the s/n was 3505A02095, the same HP prefix on my other dead dual oven 10811.
When I got it, my luck won this time, one of the coax cables is tagged 10 MHz and the other EFC. A bit of background The modules came from an HP system that was built for generating the master T1/E1 clock in a central office. Some chassis had 64 x 2.048 MHz outputs ! https://goo.gl/photos/t8oXfQ3AdQEFiji46 http://www.jackson-labs.com/assets/uploads/main/HP_AppNote.pdf I chatted with the seller, The system he got took up 2 rack bays, It had 128 ouputs, and it had a HP 5071A as the primary clock. Later version are the ones used a GPS receiver. http://atecorp.com/atecorp/media/pdfs/data-sheets/Agilent-58504A_Manual.pdf I don't think many people know about the 55400A, they more then likely didn't build many. I only read about it when this thing came up for sale. My guess is there will not be a flood of them on the surplus market. And sadly think of all the 5071A that more then likely ended up in a E-Waste/Scrap yard. -pete On Tue, Aug 4, 2015 at 2:24 PM, Charles Steinmetz <[email protected]> wrote: > Pete wrote: > > I have a HP / Symmetricom unit that has a dual oven 10811 that was part of >> a telecom master clock distribution system that was only meant to run in a >> controlled environment. >> > > I'm not 100% positive, but I believe the OCXO in your photos is not an HP > 10811, but rather the Symmetricom version, which uses a 5MHz crystal and a > frequency doubler. I bought a 58503 that the seller guaranteed had a > 10811, but it turned out to have the Symmetricom oscillator instead. When > I pointed this out, the seller offered to refund me the price of a DO > 10811, which I accepted. Just for curiosity's sake, I ran the 58503 as it > was, and after a time it settled into being one of my most stable OCXOs -- > better than all of my 10811s. > > Best regards, > > Charles > > > > > _______________________________________________ > 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.
