Re: [time-nuts] HP Z3817A Reverse Engineering
Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] HP Z3817A Reverse Engineering
I'm certainly interested. I'm in the general zip code area, so I can pick up. Call me at 714 402-1280. Thanks, Tom Sent from my HTC Inspire™ 4G on ATT - Reply message - From: ashle...@aol.com To: time-nuts@febo.com Subject: [time-nuts] HP Z3817A Reverse Engineering Date: Fri, Nov 8, 2013 7:07 am Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] HP Z3817A Reverse Engineering
Sorry, didn't see the Oregon address. I'll happily pay for shipping to California. Tom Sent from my HTC Inspire™ 4G on ATT - Reply message - From: ashle...@aol.com To: time-nuts@febo.com Subject: [time-nuts] HP Z3817A Reverse Engineering Date: Fri, Nov 8, 2013 7:07 am Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] Use of Trimble Thunderbolt for GPS clock time source?
Anyone know if the Serial DB-9 port on a T-Bolt can provide us with GPS clock time for a dual purpose? We use the 10 MHz now to create a TCXO replacement in a VHF radio (makes for good simulcast clock lock so they are all on channel) but now we need to synchronize the rest of the system using store-and-forward of our TCP packets and make everything on time. That needs real GPS clock time and we don't want to buy another GPS RX for each location. Can we get both signals from one T-Bolt? Robert L. Bob Burchett WB6SLC 22826 Mariposa Ave. Torrance CA 90502 Direct line: 310.534.4456 Website: www.EEonTheWeb.com QCWA ARRL RCA CCA ___ 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] HP Z3817A Reverse Engineering
If you need my info I would be glad to contact you direct. Maybe I could throw in a little extra. Gerald Chafee On Fri, Nov 8, 2013 at 10:07 AM, ashle...@aol.com wrote: Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] HP Z3817A Reverse Engineering
Are you looking for a Paypal payment for postage? Gerald Chafee On Fri, Nov 8, 2013 at 10:07 AM, ashle...@aol.com wrote: Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] HP Z3817A Reverse Engineering
I would be interested, Gerald Chafee On Fri, Nov 8, 2013 at 10:07 AM, ashle...@aol.com wrote: Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] HP Z3817A Reverse Engineering
Hello. Yes please. PAYPAL only. Best regards Mart From: time-nuts-boun...@febo.com [time-nuts-boun...@febo.com] on behalf of Gerald Chafee [gcha...@gmail.com] Sent: Friday, 08 November 2013 4:16 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Are you looking for a Paypal payment for postage? Gerald Chafee On Fri, Nov 8, 2013 at 10:07 AM, ashle...@aol.com wrote: Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] Morion MV89 and LTC6957
Thanks for the replies! Doesn't sound too good I'm afraid... in addition to the shipping issues, I wonder if it was the right decision to use this OCXO... Are there any low phase noise OCXO available (preferably from stock) from more conventional sellers? (i.e. distributors/online shops based in US or EU) MTI260 and the oscilloquartz look nice, but only found em on ebay as well... I've ordered 4 pieces of the MV89, maybe chinese customs will clear em and one of em will be working ok, altho thats a lotta maybes... if anyone has any alternative suggestions, please let me know! Von: Azelio Boriani azelio.bori...@screen.it Datum: 7. November 2013 11:16:11 MEZ An: Discussion of precise time and frequency measurement time-nuts@febo.com Betreff: Re: [time-nuts] Morion MV89 and LTC6957 Antwort an: Discussion of precise time and frequency measurement time-nuts@febo.com Daniel, I suggest a MTI 260 OCXO or an Oscilloquartz 8663. On Thu, Nov 7, 2013 at 1:47 AM, Bob Camp li...@rtty.us wrote: Hi All of the eBay OCXO’s are pulled from scrap gear. If they have been on eBay for a while, it’s a good bet that the gear has been pretty well picked over. The only time you can get fairly good parts is when the first hit the market. Bob On Nov 6, 2013, at 5:54 PM, Daniel Mendes dmend...@gmail.com wrote: Ok... maybe i´ll make a not so smart question but... if the MV89 is bad, what´s the recomended parts from ebay for something like that? (10MHz OCXO to upgrade some sort of equipment) (I´m asking because I did almost the same thing than our friend Hagar... I noticed that the MV89 wasn´t as good as I would like it to be). Daniel Em 06/11/2013 20:29, Bob Camp escreveu: Hi You would want a 50 ohm load on the output of the OCXO. Based on recent experience, you may have to buy 10 or more before you find one that is reasonably close to working correctly. The low output issues are far from the only problem on these units. Bob On Nov 6, 2013, at 9:27 AM, HagaaarTheHorrible hagaaar587pl...@googlemail.com wrote: Hello there, I'm trying to build a low phase noise signal generator with a Morion MV89 OCXO. ( http://www.morion.com.ru/catalog_pdf/MV89-OCXO.pdf ) The 10 MHz Sine coming from the MV89 shall be converted to a 10 MHz rectangle with the LTC6957-3 ( http://cds.linear.com/docs/en/datasheet/6957f.pdf ). Since the information in the MV89's data sheet is rather thin and shipping is taking a lot longer than expected/promised, I thought I'd ask if someone here has any experience with it and maybe can answer some questions I have... 1. Does anyone know if the MV89 is internally AC coupled / if the Output Sine has an Offset? 2. I'm not sure if termination is needed in this case or which way to terminate would be best for a low phase noise/low jitter application. Can anyone give me some hints to what would be important? Thanks a lot! ___ 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] HP Z3817A Reverse Engineering
Money has been sent via Paypal On Fri, Nov 8, 2013 at 10:07 AM, ashle...@aol.com wrote: Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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] Use of Trimble Thunderbolt for GPS clock time source?
Yes it is easy to set up. The Thunderbolt users the Palisade NTP reference clock driver. Then of course NTP will keep all your systems running on the same time. It sounds like maybe you were going to invent your own network based time sync system? Don't do that. On Thu, Nov 7, 2013 at 11:13 PM, Bob Burchett EE bob.burch...@eeontheweb.com wrote: Anyone know if the Serial DB-9 port on a T-Bolt can provide us with GPS clock time for a dual purpose? We use the 10 MHz now to create a TCXO replacement in a VHF radio (makes for good simulcast clock lock so they are all on channel) but now we need to synchronize the rest of the system using store-and-forward of our TCP packets and make everything on time. That needs real GPS clock time and we don't want to buy another GPS RX for each location. Can we get both signals from one T-Bolt? Robert L. Bob Burchett WB6SLC 22826 Mariposa Ave. Torrance CA 90502 Direct line: 310.534.4456 Website: www.EEonTheWeb.com QCWA ARRL RCA CCA ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] Morion MV89 and LTC6957
Usually new OCXOs from distributors are expensive parts (low noise being a premium feature)... if you have to use them professionally OK otherwise you have no other way than the usual auction site. On Fri, Nov 8, 2013 at 4:55 PM, HagaaarTheHorrible hagaaar587pl...@googlemail.com wrote: Thanks for the replies! Doesn't sound too good I'm afraid... in addition to the shipping issues, I wonder if it was the right decision to use this OCXO... Are there any low phase noise OCXO available (preferably from stock) from more conventional sellers? (i.e. distributors/online shops based in US or EU) MTI260 and the oscilloquartz look nice, but only found em on ebay as well... I've ordered 4 pieces of the MV89, maybe chinese customs will clear em and one of em will be working ok, altho thats a lotta maybes... if anyone has any alternative suggestions, please let me know! Von: Azelio Boriani azelio.bori...@screen.it Datum: 7. November 2013 11:16:11 MEZ An: Discussion of precise time and frequency measurement time-nuts@febo.com Betreff: Re: [time-nuts] Morion MV89 and LTC6957 Antwort an: Discussion of precise time and frequency measurement time-nuts@febo.com Daniel, I suggest a MTI 260 OCXO or an Oscilloquartz 8663. On Thu, Nov 7, 2013 at 1:47 AM, Bob Camp li...@rtty.us wrote: Hi All of the eBay OCXO’s are pulled from scrap gear. If they have been on eBay for a while, it’s a good bet that the gear has been pretty well picked over. The only time you can get fairly good parts is when the first hit the market. Bob On Nov 6, 2013, at 5:54 PM, Daniel Mendes dmend...@gmail.com wrote: Ok... maybe i´ll make a not so smart question but... if the MV89 is bad, what´s the recomended parts from ebay for something like that? (10MHz OCXO to upgrade some sort of equipment) (I´m asking because I did almost the same thing than our friend Hagar... I noticed that the MV89 wasn´t as good as I would like it to be). Daniel Em 06/11/2013 20:29, Bob Camp escreveu: Hi You would want a 50 ohm load on the output of the OCXO. Based on recent experience, you may have to buy 10 or more before you find one that is reasonably close to working correctly. The low output issues are far from the only problem on these units. Bob On Nov 6, 2013, at 9:27 AM, HagaaarTheHorrible hagaaar587pl...@googlemail.com wrote: Hello there, I'm trying to build a low phase noise signal generator with a Morion MV89 OCXO. ( http://www.morion.com.ru/catalog_pdf/MV89-OCXO.pdf ) The 10 MHz Sine coming from the MV89 shall be converted to a 10 MHz rectangle with the LTC6957-3 ( http://cds.linear.com/docs/en/datasheet/6957f.pdf ). Since the information in the MV89's data sheet is rather thin and shipping is taking a lot longer than expected/promised, I thought I'd ask if someone here has any experience with it and maybe can answer some questions I have... 1. Does anyone know if the MV89 is internally AC coupled / if the Output Sine has an Offset? 2. I'm not sure if termination is needed in this case or which way to terminate would be best for a low phase noise/low jitter application. Can anyone give me some hints to what would be important? Thanks a lot! ___ 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] HP Z3817A Reverse Engineering
Money has been sent - Paypal On Fri, Nov 8, 2013 at 11:00 AM, Mart Sakalov mart.saka...@ericsson.comwrote: Hello. Yes please. PAYPAL only. Best regards Mart From: time-nuts-boun...@febo.com [time-nuts-boun...@febo.com] on behalf of Gerald Chafee [gcha...@gmail.com] Sent: Friday, 08 November 2013 4:16 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Are you looking for a Paypal payment for postage? Gerald Chafee On Fri, Nov 8, 2013 at 10:07 AM, ashle...@aol.com wrote: Hi All, We acquired a T-Bolt from an estate , its untested, seal is unbroken, it might be good or might be Drek, but in either event its free to someone for postage from 97113 to the lower 48. It will fit into a USPS Small Rate Box for $6. We could ship it international, but at this point we don't know the cost. Thank You Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com -Original Message- From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Oct 27, 2013 1:54 pm Subject: Re: [time-nuts] HP Z3817A Reverse Engineering Hi David, Skip Withrow and I were able to figure out the connections and the basic operational features. I've attached a document that describes our findings. I wouldn't mind picking up another E1938 oscillator, but I'm reluctant to buy one that might have mismatched oscillator and circuit board (i.e. the serial numbers don't match). I've asked a couple of vendors if the serial numbers matched, but they won't respond. Does anyone have any experience with a mismatched combination? How's their performance? Ed On 10/27/2013 1:26 PM, David Hooke wrote: Hi Ed, My E1938 also came from a very battered STLN4096A from the same source, and I might also try to get the other boards functional. Could you share the details of the GPS connections, and which GPS receiver you used? Cheers, david I recently purchased a Motorola STLN4096A with the HP E1938A oscillator. I bought it for the oscillator only. Then I got intrigued by the HP Z3817A GPSDO that's included. I've reverse engineered most of it and I've got it running. The 1 PPS is really good ( 1000 measurements, Std. Dev. of 200 ps, min to max range of 1.5 ns) and the HUP is very slowly dropping (currently at 13 us after ~1.5 days) as the oscillator works out the kinks after it's long sleep. It's dropping much slower than my Z3801A did when I first turned it on. There's one input that I haven't been able to figure out. I've got data in and 1 PPS in from the GPS receiver. Everything seems to be working so I'm at a loss what that the other input could be for. There are no clues to it's function because it appears to go into one of the Xilinx chips. Does anyone have any more info on the unit? Has anyone figured out the other input? I have searched the net and the archives. There's very little info or discussion on this unit. 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. ___ 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.
[time-nuts] Bathys Atomic time wristwatch with Symmetricon SA.45s CASC
hello, Couldn't find a reference in the mailling list so i put here the link to news: http://upstart.bizjournals.com/companies/rebel-brands/2013/11/01/john-patterson-bathys-atomic-watch.html?page=all Good for collector's of wristwatches i imagine... ;) Cheers, Andre Esteves ___ 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] Bathys Atomic time wristwatch with Symmetricon SA.45s CASC
I am holding out for the Leapsecond version to be available to the public with low Phase Noise 10MHz, 5MHz, And 1PPS outputs, and the built in adapter with low jitter 44.1KHz and 192KHz outputs for my home entertainment system. Thomas Knox Date: Fri, 8 Nov 2013 17:25:49 + From: aifeste...@gmail.com To: time-nuts@febo.com Subject: [time-nuts] Bathys Atomic time wristwatch with Symmetricon SA.45s CASC hello, Couldn't find a reference in the mailling list so i put here the link to news: http://upstart.bizjournals.com/companies/rebel-brands/2013/11/01/john-patterson-bathys-atomic-watch.html?page=all Good for collector's of wristwatches i imagine... ;) Cheers, Andre Esteves ___ 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] EGG RFS-10-7 output selection
Hi, I used to have notes on how to select which output frequency the EGG RFS-10-7 provides but I can't find them! It can be 5 or 10 Mhz. Does anybody know where the selection is made? Thanks, Corby Dawson ___ 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] Anyone want an engineering job making a GPSDO comparator for T-Bolts?
We successfully replaced an internal low-quality TCXO with an external T-Bolt signal with much help from Time Nuts; but one guy called me up and suggested we discipline the INTERNAL oscillator instead of replacing it with an external signal. I think his name was Bill (but can't remember for sure!) and now I am stuck for an answer on how to build a comparator to watch one with the other and back-feed a control signal to manage one with the other. Short of him not remembering me anymore than I remember HIS name; is anyone else interested in a contract engineering job to design such a comparator? I am a pretty sharp radio guy but this is a few millimeters outside my talent range! Robert L. (Bob) Burchett WB6SLC CCA AC-12-12727 22826 Mariposa Ave. Torrance CA 90502 310.534.4456 bob.burch...@eeontheweb.com QCWA ARRL ___ 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] 3GHZ Extender for HP 53131A and 53132A
I suppose this might be a bit off topic, but for those of us with these HP counters there's been very good deal running on 3GHz extender boards on Ebay for the past few weeks. These aren't HP originals but they are new plug 'n play alternatives, certainly a very good clone, and excellent value at $98 BIN, or with an auction option starting at $75 if you fancy your luck. The current auction, if not already sold, is number 111210845150. Usual disclaimer, I have no vested interest other than as a happy customer, and he doesn't seem to need much help from me to sell them anyway:-), but I thought some others here might be interested. I bought one last week, shipping from Poland to the UK took just a few days, and was sufficiently impressed to buy another one earlier this evening, and no I probably didn't really need one, let alone two, but they are very nice:-) At 1000 MHz, the highest frequency I can generate right now, I've measured the channel 3 input sensitivity as -50dBm with a sinusoidal signal. Regards Nigel GM8PZR ___ 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] Anyone want an engineering job making a GPSDO comparator for T-Bolts?
I wonder what you gain by this? You still need the GPS to provide a reference. Either you use it's 1Hz or 10MHz output. Then you compare the phase of these to the phase o the TCXO and adjust the TCXO until the phase is constant relative to the reference. The instrument still needs the signal coming into it. OK the advantage is the you can disconnect the signal the the internal TCXO will continue to run undisciplined. Comparing the phase of the TXCO and reference is not hard. the simplest is to use an XOR logic gate. Is this a one-off deal? If you only have one TCXO to replace you can buy something off the shelf. If you intend to place this into production than the engineering cost may be worth it. On Fri, Nov 8, 2013 at 2:51 PM, Bob Burchett bob.burch...@eeontheweb.comwrote: We successfully replaced an internal low-quality TCXO with an external T-Bolt signal with much help from Time Nuts; but one guy called me up and suggested we discipline the INTERNAL oscillator instead of replacing it with an external signal. I think his name was Bill (but can't remember for sure!) and now I am stuck for an answer on how to build a comparator to watch one with the other and back-feed a control signal to manage one with the other. Short of him not remembering me anymore than I remember HIS name; is anyone else interested in a contract engineering job to design such a comparator? I am a pretty sharp radio guy but this is a few millimeters outside my talent range! Robert L. (Bob) Burchett WB6SLC CCA AC-12-12727 22826 Mariposa Ave. Torrance CA 90502 310.534.4456 bob.burch...@eeontheweb.com QCWA ARRL ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] 3GHZ Extender for HP 53131A and 53132A
On 2013-11-08 15:49, gandal...@aol.com wrote: At 1000 MHz, the highest frequency I can generate right now, I've measured the channel 3 input sensitivity as -50dBm with a sinusoidal signal. Regards Nigel GM8PZR This high sensitivity is probably a bad thing, not a good thing. It is indicative of a dynamic divider. For a frequency counter prescaler, you want a static divider, such as the HP5386 used. Dynamic dividers make errors if the signal being measured has a broadband noise floor or sufficiently high spurs at any frequency. Rick Karlquist N6RK ___ 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] 3GHZ Extender for HP 53131A and 53132A
Wouldn't an attenuator solve that? On 11/8/2013 7:03 PM, Richard Karlquist wrote: On 2013-11-08 15:49, gandal...@aol.com wrote: At 1000 MHz, the highest frequency I can generate right now, I've measured the channel 3 input sensitivity as -50dBm with a sinusoidal signal. Regards Nigel GM8PZR This high sensitivity is probably a bad thing, not a good thing. It is indicative of a dynamic divider. For a frequency counter prescaler, you want a static divider, such as the HP5386 used. Dynamic dividers make errors if the signal being measured has a broadband noise floor or sufficiently high spurs at any frequency. Rick Karlquist N6RK ___ 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] 3GHZ Extender for HP 53131A and 53132A
Hi Rick As far as I'm aware this is pretty much a copy of the HP original which used a Fujitsu, or similar, MB510-PF prescaler, so a sort of what you see is what you get situation:-) Regards Nigel GM8PZR In a message dated 09/11/2013 00:03:58 GMT Standard Time, rich...@karlquist.com writes: On 2013-11-08 15:49, gandal...@aol.com wrote: At 1000 MHz, the highest frequency I can generate right now, I've measured the channel 3 input sensitivity as -50dBm with a sinusoidal signal. Regards Nigel GM8PZR This high sensitivity is probably a bad thing, not a good thing. It is indicative of a dynamic divider. For a frequency counter prescaler, you want a static divider, such as the HP5386 used. Dynamic dividers make errors if the signal being measured has a broadband noise floor or sufficiently high spurs at any frequency. Rick Karlquist N6RK ___ 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] 3GHZ Extender for HP 53131A and 53132A
rich...@karlquist.com said: This high sensitivity is probably a bad thing, not a good thing. It is indicative of a dynamic divider. For a frequency counter prescaler, you want a static divider, such as the HP5386 used. Dynamic dividers make errors if the signal being measured has a broadband noise floor or sufficiently high spurs at any frequency. What do static and dynamic mean in that context? Is it the same as DRAM vs SRAM? If so, I don't see any obvious way that translates into one works and the other doesn't. -- These are my opinions. I hate spam. ___ 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] 3GHZ Extender for HP 53131A and 53132A
In a message dated 09/11/2013 01:30:14 GMT Standard Time, hmur...@megapathdsl.net writes: rich...@karlquist.com said: This high sensitivity is probably a bad thing, not a good thing. It is indicative of a dynamic divider. For a frequency counter prescaler, you want a static divider, such as the HP5386 used. Dynamic dividers make errors if the signal being measured has a broadband noise floor or sufficiently high spurs at any frequency. What do static and dynamic mean in that context? Is it the same as DRAM vs SRAM? If so, I don't see any obvious way that translates into one works and the other doesn't. I wondered that. cc.ee.ntu.edu.tw/~jrilee/course/COMMIC08/CommIC_07.pdf The MB510 looks to be a series of flip-flops so presumably would be classified as a static divider? Regards Nigel GM8PZR -- These are my opinions. I hate spam. ___ 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] Use of Trimble Thunderbolt for GPS clock time source?
bob.burch...@eeontheweb.com said: Anyone know if the Serial DB-9 port on a T-Bolt can provide us with GPS clock time for a dual purpose? We use the 10 MHz now to create a TCXO replacement in a VHF radio (makes for good simulcast clock lock so they are all on channel) but now we need to synchronize the rest of the system using store-and-forward of our TCP packets and make everything on time. That needs real GPS clock time and we don't want to buy another GPS RX for each location. Can we get both signals from one T-Bolt? Sure. I think the right model for the box is that the PPS and 10 MHz just run all the time and you can also talk to it over the serial port. The serial port can do monitoring and control. Monitoring includes things like watching the satellites and telling you the time. What sort of time accuracy do you need? If you are forwarding TCP packets, I assume UDP works too. It would be interesting to see what NTP thinks of that channel. -- These are my opinions. I hate spam. ___ 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] 3GHZ Extender for HP 53131A and 53132A
On 2013-11-08 17:38, gandal...@aol.com wrote: What do static and dynamic mean in that context? Is it the same as DRAM vs SRAM? If so, I don't see any obvious way that translates into one works The MB510 looks to be a series of flip-flops so presumably would be classified as a static divider? Regards Nigel GM8PZR Dynamic dividers oscillate when not driven. Static dividers are like ordinary flip flops used for logic and do not oscillate when the clock signal is removed. The MB510 is probably nothing great, even if it was used by HP in some counters. I personally was to blame for designing the MB506 into the 5334B counter. I was trying to reduce factory cost. I knew perfectly well it didn't work all that well. It was at least no worse that the divider used in the 5334A, which was made by HP in Santa Clara and cost $100. The dividers that were made by HP in Santa Rosa were much better because they were static. The 5386 used these. They were also not cheap. Rick Karlquist N6RK HP 5334B Project Manager ___ 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] 3GHZ Extender for HP 53131A and 53132A
Maybe he means fixed vs. automatic gain (or threshold)? Perhaps a worry about picking up higher frequency noise on a lower frequency but larger signal you are looking to measure? Peter On 11/8/2013 8:38 PM, gandal...@aol.com wrote: In a message dated 09/11/2013 01:30:14 GMT Standard Time, hmur...@megapathdsl.net writes: rich...@karlquist.com said: This high sensitivity is probably a bad thing, not a good thing. It is indicative of a dynamic divider. For a frequency counter prescaler, you want a static divider, such as the HP5386 used. Dynamic dividers make errors if the signal being measured has a broadband noise floor or sufficiently high spurs at any frequency. What do static and dynamic mean in that context? Is it the same as DRAM vs SRAM? If so, I don't see any obvious way that translates into one works and the other doesn't. I wondered that. cc.ee.ntu.edu.tw/~jrilee/course/COMMIC08/CommIC_07.pdf The MB510 looks to be a series of flip-flops so presumably would be classified as a static divider? Regards Nigel GM8PZR ___ 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] 3GHZ Extender for HP 53131A and 53132A
On 2013-11-08 18:07, Peter Gottlieb wrote: Maybe he means fixed vs. automatic gain (or threshold)? Perhaps a worry about picking up higher frequency noise on a lower frequency but larger signal you are looking to measure? Peter The problem is the opposite. Low frequency noise will wipe out measurement of high frequency signals. They used to test the 5334A/B above 1 GHz by driving it with an HP 8660 followed by a 1 GHz high pass filter. Rick ___ 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] Anyone want an engineering job making a GPSDO comparator for T-Bolts?
Bob wrote: We successfully replaced an internal low-quality TCXO with an external T-Bolt signal with much help from Time Nuts; but one guy called me up and suggested we discipline the INTERNAL oscillator instead of replacing it with an external signal. Whether or not this is a good idea depends entirely on your particular needs. A GPSDO works by relying on the quartz oscillator for stability at low tau, and the GPS for stability at higher tau. In the case of a quartz OCXO, the crossover generally occurs between perhaps fifty and several hundred seconds. If you need good stability at tau 100 seconds, where the GPS is not very stable, the disciplined TCXO may be much worse than the disciplined OCXO (both because the oven stabilizes the crystal better, and because OCXOs generally use better crystals in the first place). When excellent stability at tau 100 seconds is required, you would likely find the disciplined TCXO inferior to a disciplined OCXO. This is not to say that disciplined TCXOs are necessarily junk -- Jackson Labs makes some that reportedly perform fairly well -- but I suspect JL uses better TCXOs than the ones you usually find. Even so, their disciplined TCXOs are not as good as their disciplined OCXOs. Best regards, Charles ___ 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] Anyone want an engineering job making a GPSDO comparator for T-Bolts?
Chris wrote: I wonder what you gain by this? You still need the GPS to provide a reference. Either you use its 1Hz or 10MHz output. Then you compare the phase of these to the phase o the TCXO and adjust the TCXO until the phase is constant relative to the reference. Certainly if you start with a GPS that puts out 10 MHz (i.e., a GPSDO), there is very little reason to use the 10 MHz to lock the internal TCXO rather than simply replacing the TCXO output with the output of the GPSDO (plus whatever dividers, etc. are necessary if the TCXO frequency is not 10 MHz, which are already part of the current solution as I understand it). The real reason to make the change would be to replace the pricey 10 MHz GPSDO with a $2.00 GPS module that puts out only a PPS signal. Of course, the PLL is much more complex when you are locking to a PPS signal, so the cost of the newly-designed PLL would bridge some of the price gap. Best regards, Charles ___ 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.
