Re: [time-nuts] Efratom Rubidium SPTB-100/LN-001 info wanted
I have three of these units, and have been looking for the right manual for years. Thanks for this part, but I believe the SPTB is different from the FRK in the schematics and some of the construction detail - for example, since it's 5 MHz vs 10, that circuit is different, not just the crystal frequency. I have found other things in the PLL too, that probably relate to the LN performance. I have managed to use the *FRK manual, which is close enough to get by - the circuit operation is the same, just the design details differ. I also had to replace a capacitor in one unit that would not lock - it was a leaky ceramic one in the PLL. I had to do a bit of guesswork and shotgunning, since the circuit topology and parts layout were quite a bit different in that area. *I may be confusing it with another model - the M-100, I think, that is similar. This was a few years ago. Ed ___ 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] Efratom Rubidium SPTB-100/LN-001 info wanted
Is the Tektronix p/n on the unit ? it may be 119--xx On Thu, Dec 5, 2013 at 7:34 PM, Rex r...@sonic.net wrote: I have an SPTB-100. It seems to be a custom version of a standard FRK(LN) rubidium for Tektronics. I got mine around 2000. (Mine is an 88 date-code vs. your ancient 86 version.) It didn't work initially because the internal Xtal oscillator wouldn't sweep through lock frequency. Changed a cap in the oscillator and it worked again. I've only powered it up a few times; I assume mine is still working. I was told it is low-noise for a rubidium. Somewhere locally, I got a copy of a manual for it. Other than the cover page, it seems to be a standard FRK manual, which the KO4BB pages already have. Today, I made a short PDF with a scan of the cover page and a few notes I wrote up. You can get it here: http://www.xertech.net/pub/SPTB-100%20notes.pdf I also uploaded it to KO4BB for future references. If anyone knows more or sees any problems with what I wrote up, please let me know and I'll correct or update. -Rex KK6MK On 12/4/2013 7:08 PM, Jerome Peters wrote: Hello, Can anybody shed some light on this particular model: Model - SPTB-100/LN-001 Efratom part No. 703-200-11 Date Code 8609 (I have looked at K04BB's website, it has lots of other models, but not this one). Thank You, Jerome AF6UX --- This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. --- ___ 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] Efratom Rubidium SPTB-100/LN-001 info wanted
Thanks Rex, this is terrific information! It is awfully kind of you to take the time effort to write up and post the note. I'm all set now. The generosity of the Time-nuts community if very inspiring. Jerome AF6UX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Rex Sent: Thursday, December 05, 2013 4:35 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Efratom Rubidium SPTB-100/LN-001 info wanted I have an SPTB-100. It seems to be a custom version of a standard FRK(LN) rubidium for Tektronics. I got mine around 2000. (Mine is an 88 date-code vs. your ancient 86 version.) It didn't work initially because the internal Xtal oscillator wouldn't sweep through lock frequency. Changed a cap in the oscillator and it worked again. I've only powered it up a few times; I assume mine is still working. I was told it is low-noise for a rubidium. Somewhere locally, I got a copy of a manual for it. Other than the cover page, it seems to be a standard FRK manual, which the KO4BB pages already have. Today, I made a short PDF with a scan of the cover page and a few notes I wrote up. You can get it here: http://www.xertech.net/pub/SPTB-100%20notes.pdf I also uploaded it to KO4BB for future references. If anyone knows more or sees any problems with what I wrote up, please let me know and I'll correct or update. -Rex KK6MK On 12/4/2013 7:08 PM, Jerome Peters wrote: Hello, Can anybody shed some light on this particular model: Model - SPTB-100/LN-001 Efratom part No. 703-200-11 Date Code 8609 (I have looked at K04BB's website, it has lots of other models, but not this one). Thank You, Jerome AF6UX -- - This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. -- - ___ 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] Efratom Rubidium SPTB-100/LN-001 info wanted
I have an SPTB-100. It seems to be a custom version of a standard FRK(LN) rubidium for Tektronics. I got mine around 2000. (Mine is an 88 date-code vs. your ancient 86 version.) It didn't work initially because the internal Xtal oscillator wouldn't sweep through lock frequency. Changed a cap in the oscillator and it worked again. I've only powered it up a few times; I assume mine is still working. I was told it is low-noise for a rubidium. Somewhere locally, I got a copy of a manual for it. Other than the cover page, it seems to be a standard FRK manual, which the KO4BB pages already have. Today, I made a short PDF with a scan of the cover page and a few notes I wrote up. You can get it here: http://www.xertech.net/pub/SPTB-100%20notes.pdf I also uploaded it to KO4BB for future references. If anyone knows more or sees any problems with what I wrote up, please let me know and I'll correct or update. -Rex KK6MK On 12/4/2013 7:08 PM, Jerome Peters wrote: Hello, Can anybody shed some light on this particular model: Model - SPTB-100/LN-001 Efratom part No. 703-200-11 Date Code 8609 (I have looked at K04BB's website, it has lots of other models, but not this one). Thank You, Jerome AF6UX --- This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. --- ___ 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.
