Timing Center - Maser Log
as of Monday, 07-Oct-2013 04:04:42 ASTGo to Most Recent Entry
| Name | Date | Comment | |
|---|---|---|---|
| ANS | anolla@naic.edu | 12/19/2000 | The HM was installed back as Household reference since 12/18/2000 AST 13:21.It had problems with the Vacion , WG fixed it. GPS 3 was been used as household reference while HM was out of service & the Rub 1 supplied the 5 Mhz for the Buffers. |
| ANS | anolla@naic.edu | 1/23/2001 | The HM is out of service for maint. by Don Rhine , he is performing the Vacion replacement & adjustments on it. |
| ANS | anolla@naic.edu | 1/25/2001 | HM back as household ref since 1/25/2001. Don Rhine replaced both Vacion pumps on unit. |
| ANS | anolla@naic.edu | 3/13/2001 | W Genter replaced the back up batteries in the HM. Were 4 of them ,the replacement are Power Sonic model PS-12750 NBH 12 VDC 75 AH. |
| LW | lwray@naic.edu | 3/16/2001 | The HM wheels are in the storage van. Also spare parts for the HM are in the cryo shop in a shelf especially for them. |
| LW | lwray@naic.edu | 3/19/2001 | On 3/16/2001 WG & LW adjusted the T Time clock , now is +/- .140 usec. |
| LW | lwray@naic.edu | 4/20/2001 | WG is working with the Stanford clock software. He found that the comp DB 9 connector was wrongly wired. |
| LW | lwray@naic.edu | 5/4/2001 | HM charging system was not working properly, so batteries were weak (17 vdc instead 24 vdc) .Due to this clocks came out of sync when try to replace the UPS on HM. Clocks were reseted. |
| LW | lwray@naic.edu | 5/7/2001 | Rub 1 & 2 were sync. Rub 1 is 9.72 us & Rub 2 is 8.07 us. |
| LW | lwray@naic.edu | 8/17/2001 | Air Conditioner unit quit working since midnight , so auxiliary ac unit at window turned on by telescope operator. Room temp was at 87 f , doors opened to let cooled air circulate. |
| LW | lwray@naic.edu | 9/5/2001 | HM failed due to the 18 VDC power supply , it was replaced with the Rub 1 standard since 9/4/2001. HM back into service |
| LW | lwray@naic.edu | 9/17/2001 | Room temp at 80ºf due to failure on main AC unit. Window unit turned on. |
| LW | lwray@naic.edu | 2/26/2002 | Room was without air conditioner from 1:00 AM to 8:00 AM , nobody turned on the auxiliary ac unit at the window until 8:00 AM. |
| ans | anolla@naic.edu | Tuesday, August 27, 2002 13:51:03 | Temp chart paper recorder pens filled with ink. |
| ans | anolla@naic.edu | Wednesday, November 13, 2002 08:55:12 | DATUM clock replacing the Rb 1 , is 20 nsec off from HM. |
| LSW | lwray@naic.edu | Monday, December 2, 2002 17:27:13 | 100 MHz reference was out of lock, noticed on Thursday night (SETI observations). Crystal oscillator has been re-tuned. No idea yet how long this has been out of lock. |
| ans | anolla@naic edu. | Thursday, February 6, 2003 08:46:14 | NIST recvr was out during the last 5 days. Its 1PPS sync signal from HM was out for 718 msec. It happen since 1/30/2003 due to a power glitch. |
| ans | anolla@naic edu. | Tuesday, March 4, 2003 14:23:43 | The problem with the NIST was that the maser clock A was not sync with clock B. Have to double check it after reseting the HM. |
| ans | anolla@naic.edu | Tuesday, March 4, 2003 14:26:42 | The HM battery charger was not working due to an open 10 amp fuse in the battery charger ckt. It was replaced and it is charging . This condition has more than six months with it.EC found the problem. |
| ans | anolla@naic edu. | Wednesday, March 5, 2003 12:52:49 | The HM was tested for battery auxiliary power.It's 110 vac was removed and was left with the battery back up , no problems with it.It worked perfectlly. The batteries were checked again before these test .baterry 1 was 12.9 v , battery 2 was 13.4 v ,battery 3 was 12.1 v and battery 4 was 12.6 v. |
| ans | anolla@naic edu. | Tuesday, March 11, 2003 12:33:38 | Batteries for the power back up been ordered by EC , They are Power Sonic model PS-12750 NHB 12VDC 75 AH. |
| ans | anolla@naic.edu | Wednesday, March 19, 2003 14:51:22 | After a series of consecutive power dips check the clocks an WALLLAAAA!!!!!!! All of them on time.Thanks Eddie!!!!!!! |
| ans | anolla@naic.edu | Friday, March 28, 2003 09:01:14 | There it was a power dip that lasted around 1 minute.HM and clocks were ok except GPS 3 & Stanford clock that it's tide to it. |
| ans | anolla@naic.edu | Tuesday, April 1, 2003 16:13:08 | Commercial power was out since AST 08:34 until AST 15:45.All clocks are OK except the GPS 3 that is out since power dip on 3/28/2003, Calixto is working on it. |
| ans | anolla@naic.edu | Tuesday, April 8, 2003 12:44:11 | GPS 3 back into service.While checking power supply and power for the rf section of the GPS it came back functional.Why???? I don't know , but it is working. |
| ans | anolla@naic.edu | Tuesday, April 22, 2003 13:18:44 | Ed Castro adjusted the cavity , it was set from 30676 to 31581 , it's a 905 bit increase. Was a Bill Diner request. |
| ans | anolla@naic.edu | Tuesday, May 20, 2003 14:21:27 | Calixto was checking the phase jitter of the D. Backer GPS ,and to the Datum GPS. |
| ans | anolla@naic.edu | Tuesday, May 27, 2003 14:53:06 | The 28 vdc main power supply was bad , it had a high ripple on it (.5 v ). Was replaced with the spare one , but was wired outside the HM due tha was not identical as the one on the HM. |
| ans | anolla@naic.edu | Thursday, May 29, 2003 10:19:51 | The external main 28 vdc power supply was triped off forunknow reason. So the HM was running on its auxiliary battery supply.We do not want to remove the original power supply until next maintenance time in order to avoid a further problem with the HM. |
| ans | anolla@naic.edu | Monday, June 16, 2003 14:21:53 | The main + 28 power supply was fixed by IC , it had it's electolitic capacitors bad, all were replaced. |
| ans | anolla@naic.edu | Monday, June 16, 2003 14:25:28 | The Datum clock was removed in order to send it to factory for modification , a 5 mhz rub osc is going to be installed to have a 5 mhz out available. |
| ans | anolla@naic.edu | Thursday, June 19, 2003 09:01:01 | The computer table was swapped in order to open an space for the new Datum HM that will arrive this Friday. |
| ans | anolla@naic.edu | Monday, June 23, 2003 13:15:13 | The new Datum HM arrived.Calixto is working on it , it came without batteries for the back up power. |
| ans | anolla@naic.edu | Tuesday, July 1, 2003 10:10:39 | Panasonic batteries LC-X1242P installed in the new Datum HM.They are in series to have +24 vdc as an auxiliary power back up. |
| ans | anolla@naic.edu | Thursday, July 3, 2003 08:47:49 | Calixto is performing some test with the new Datum HM. He is compearing the old HM 1PPS out with the new Datum HM.The T Time clock been used to produce the Datum 1 PPS , we locked it to the Datum using the 10 mhz out of it to lock the T Time clock ref oscillator. |
| ans | anolla@naic.edu | Monday, July 7, 2003 09:10:40 | The T Time clock was set to have the Datum 10 mhz ref on it , in oder words we are compearing the Old HM with the Datum HM thru the T Time clock 1 PPS. |
| ans | anolla@naic.edu | Friday, July 11, 2003 15:49:27 | The Datum clock is back after its modification ( add a 5 mhz output ) Calixto installed it. |
| ans | anolla@naic.edu | Monday, July 14, 2003 14:58:43 | The HM back up power supply batteries were replaced. Were Power Sonic PS-12750 12 vdc 75 AH. Now are YUASA DM55-12. |
| ans | anolla@naic.edu | Monday, August 11, 2003 15:32:54 | There is a new table and computer at the timing room. |
| ans | anolla@naic.edu | Wednesday, August 13, 2003 08:50:22 | The Stanford clock was removed , then a TRAK clock model 9000A was installed instead. Calixto is working in its settings. |
| ans | anolla@naic.edu | Wednesday, October 1, 2003 16:04:34 | The DATUM Maser was connected to the NIST receiver ,it will be like that for a month for testing purposes. |
| ans | anolla@naic.edu | Wednesday, October 8, 2003 14:25:26 | Program not running.Was reset.There were power dips. |
| ans | anolla@naic.edu | Monday, December 1, 2003 16:26:37 | The NIST receiver was set up again with the old hydro Maser ( 1PPS & 5 Mhz). It was done at AST 14:15. |
| ans | anolla@naic.edu | Wednesday, January 14, 2004 15:24:50 | The main 28 vdc power supply quit working so we put the spare one , but it didn't last.Power consumption of these P.S. is 5 amp and the power consumption of the HM ckt is above 8 amps. So we put a lab one that is up to 10 amps.CR sent for a spares P.S. Also the HM was reset by Ed Castro on 1/14/2003 at AST 14:00. All clocks are on time. |
| ans | anolla@naic.edu | Tuesday, March 2, 2004 08:52:18 | Calixto tried to replace the power supply from the lab to the existing repaired one , but didn't work. Today (3/2/2004) the room temp is 4º higher than normal. |
| ans | anolla@naic.edu | Tuesday, March 2, 2004 16:25:06 | Calixto tried the fix Lambda P.S. , but didn't work . HM load was tripping it off. So HM with lab P.S. for a while. |
| ans | anolla@naic.edu | Wednesday, March 3, 2004 10:19:45 | The HM old P.S. was installed after been fix , but it didn't worked .It was not holding the load , it is supposed that it's load is 8 amps.In the need of a new one P.S. |
| ans | anolla@naic.edu | Tuesday, March 16, 2004 13:01:43 | The old Lambda +28 vdc P.S. was installed in HM on 3/11/2004. |
| ans | anolla@naic.edu | Monday, April 19, 2004 13:16:48 | The temp chart recorder ink pens arrived . So chart recorder back into action. |
| ans | anolla@naic.edu | Thursday, May 27, 2004 12:50:51 | TRAK clock has been under stress due to power dips due to AEE (power company) service. It had to be adjusted a couple of times during the last two days, we have been running on emergency power for around a week. |
| ans | anolla@naic.edu | Thursday, August 12, 2004 08:59:36 | HM is out.Is by +/- 11 milliseconds. |
| ans | anolla@naic.edu | Thursday, August 12, 2004 11:48:40 | JPL HM was out since 8/12/2004 AST 02:01:04. DATUM clock is in since 8/12/2004 AST 10:48:00. |
| ans | anolla@naic.edu | Friday, August 13, 2004 15:57:14 | DATUM standard clock is shifting by 50 nsec/day vs. GPS clocks. |
| ans | anolla@naic.edu | Monday, August 16, 2004 08:43:07 | Calixto was setting the DATUM GPS clock outputs at back of it in order to have more 1 PPS outputs on it at 8/13/2004. |
| ans | anolla@naic.edu | Thursday, August 19, 2004 15:56:10 | EC , JRV & ANS were working with the JPL HM in order to put it back into service. The left side vacion pump was shorted out. Still working on it. |
| ans | anolla@naic.edu | Wednesday, August 25, 2004 16:07:13 | Bill Sisk found that the power output of the 5 mhz coming from the DATUM maser to the 5 mhz driver buffers was +17 dbm , so he add an attenuator in order to lowered to + 13 dbm. |
| ans | anolla@naic.edu | Monday, August 30, 2004 16:00:17 | DATUM Maser still shifting +/- 50 nsec/day. |
| ans | anolla@naic.edu | Thursday, September 9, 2004 09:11:47 | Due to power brakedown of 1.5 hrs.(were at aux generator) clocks went bad , Bill Genter set all clocks with the DATUM GPS 4 as reference , all were less than 200 nsec. |
| ans | anolla@naic.edu | Friday, September 10, 2004 11:08:10 | CR & BG set the TRAK 2 clock. It was out due to power shut (1.5 hrs.) from yesterday. This clock produces the 1 PPS from DATUM maser to compare the it with the rest of the clocks. |
| ans | anolla@naic.edu | Tuesday, September 14, 2004 09:15:46 | Personnel from Honeywell working with old HM. |
| ans | anolla@naic.edu | Friday, September 24, 2004 13:17:18 | Bill Genter fix the GPS 2 receiver (Joe Taylor). He found the BNC connector at the antenna output broken. |
| BG | anolla@naic.edu | Wednesday, September 29, 2004 08:16:44 | C.Rodriguez updated firmware for NIST GPS recvr. |
| W. Genter | wgenter@naic.edu | Sunday, October 31, 2004 10:38:08 | 10/27/04 A. Nolla reported that GPS-3 was off time. On checking the software was found to be locked and not tracking. Re-initalized the software and now GPS-3 is OK. |
| ans | anolla@naic.edu | Monday, May 16, 2005 15:35:08 | System ok.Sometimes the program has an APT condition (Abnormal program Termination), like this month with 3 times. |
| ans | anolla@naic.edu | Tuesday, July 5, 2005 09:05:23 | Calixto adjusted the trak 2.The Trak 1 has to be adjusted. |
| ans | anolla@naic.edu | Friday, August 5, 2005 10:54:03 | Bill Genter cleaned out the Joe Taylor computer disk , it was full.So it was not taking the latest data. |
| ans | anolla@naic.edu | Friday, August 26, 2005 13:13:12 | Clocks power was turned off by maintenance people.During a power outage at the site the electricians shut off the power braker for the timing room line conditioner.Clocks (all) were reset. |
| ans | anolla@naic.edu | Monday, August 29, 2005 10:08:33 | TRAK clock readind was 1.517 usec against maser. All other clocks were out , why ? |
| ans | anolla@naic.edu | Tuesday, August 30, 2005 15:56:12 | Symmetricom maser suffer a major brake down on 8/28/2005 at AST 01:00. So the DATUM GPS 4 was set as house reference on 8/29/2005 AST 15:30.Today was found a blown fuse for the cavity heater.It will take around 2 days to stabilize according to the manufacturer advice. |
| ans | anolla@naic.edu | Wednesday, August 31, 2005 11:33:41 | C.R. set on time the TRAK 2 receiver.Now the NIST receiver ism getting the rigth data.It was set on 8/30/2005 AST 16:07. |
| ans | anolla@naic.edu | Friday, September 2, 2005 11:22:16 | The Symmetricom maser back as house reference since 9/2/2005 AST 10:51. Control room notify. |
| ans | anolla@naic.edu | Tuesday, September 6, 2005 14:56:29 | System checked after more than 72 hrs. run ,Maser stability is exellent. Still under survillance. |
| ans | anolla@naic.edu | Friday, September 30, 2005 16:14:12 | Yesterday Calixto replaced an UPS for our clocks.Later he reseted them.Today I found the TRAK clock out for 1 second.So I reset it & informed BG & Calixto.Clocks were ok yesterday. |
| ans | anolla@naic.edu | Thursday, October 6, 2005 12:36:26 | On 10/4/2005n found that the antenna cable for the Don Backer GPS was bad , fix it up and GPS back to normal.Today Calixto performed a test to the TRAK 2 clock which show that the alarm for the reference input was not working.So unit is going back to factory in order to be repaired.The 1 PPS reference for sampler & NIST receiver are the outputs 9 & 10 of the 1 PPS buffers been feeded by the TRAK clock respectivily. |
| ans | anolla@naic.edu | Thursday, October 6, 2005 13:54:35 | GPS 2 (Joe Taylor) not working. |
| ans | anolla@naic.edu | Friday, October 7, 2005 13:51:07 | The GPS 2 (Joe Taylor) receiver been fix replacing his burned out antenna rf section with the one of the GPS 3 , they are compatible.David Nice getting a new antenna for the GPS 2. |
| ans | anolla@naic.edu | Tuesday, October 11, 2005 11:55:02 | TRAK 2 removed from timing room in order to check it or send it to factory for repairs. |
| ans | anolla@naic.edu | Tuesday, November 29, 2005 11:24:49 | TRAK 2 installed today after replacing the alarm card. |
| ans | anolla@naic.edu | Tuesday, January 10, 2006 13:34:47 | True Time clock set by Calixto.It was out by 27 usec.Set on 1/10/2006 at AST 13:15. |
| ans | anolla@naic.edu | Friday, January 13, 2006 15:37:53 | The antenna for the GPS 3 was hooked up. |
| W. Genter | wgenter@naic.edu | Tuesday, February 7, 2006 10:17:16 | While conducting weekly detailed checks of the timing related equipment, the LCD display on the TrueTime Code Generator was found to be washed-out. The display intensity was at maximum. I have requested a quotation from TrueTime for a new LCD display. |
| ans | anolla@naic.edu | Tuesday, March 28, 2006 09:15:48 | The IRIG clock at the control room was frozen ,Willy Iguina unplug it to reset it.Back to normal. |
| ans | anolla@naic.edu | Monday, May 8, 2006 10:48:33 | The timing room run out of power for more than 8 hours on 4/29/2006 AST 22:30 .BG came to set system.All clocks were out , Maser was ok after the 8 hours. |
| ans | anolla@naic.edu | Wednesday, May 10, 2006 11:36:59 | The timing room power was cutoff at AST 11:08 and return it at AST 11:22 in order to replace the burned out cables of the 208 vac xformer of our power substation.Timing cabinet power (UPS)for the clocks was connected into the visitors room power. |
| ans | anolla@naic.edu | Wednesday, June 21, 2006 13:13:17 | Manuel Alvarez replaced burned out flusforecent ligths. |
| ans | anolla@naic.edu | Wednesday, July 5, 2006 10:33:21 | The Don Backer GPS ( #5 ) receiver removed.Going to be shipped back. |
| Bill | wgenter@naic.edu | Monday, January 8, 2007 14:06:04 | Adjusted maser synthesizer to 57516861453 this AM. This is to reduce the heater voltage and bring the maser slope to a positive region. This will raise the frequency of the maser 1.3E-14. |
| ans | anolla@naic.edu | Monday, April 23, 2007 13:09:58 | On Friday 20 ,2007 we run the clocks with an external power generator feeding the UPS.The TRAK clock was reset.Rest was ok. |
| ans | anolla@naic.edu | Monday, April 23, 2007 13:11:45 | Forgot to mention that was due to a power shut down that was programed. |
| ans | anolla@naic.edu | Thursday, May 10, 2007 13:08:53 | All not used rf cables were removed from timing room.Were 5 of them. |
| ans | anolla@naic.edu | Wednesday, May 16, 2007 13:41:28 | The equipments at the timing room rack were relocated in order to make space for the clocks at the small rack on top of it on 5/14/2007.Also the batteries for the NIST receiver were replaced , it has to be done yearly. |
| ans | anolla@naic.edu | Thursday, May 17, 2007 10:05:53 | The memory batteries of the NIST receiver were replaced yesterday , but accidentally the power cord of the receiver was removed by me , then the receiver was to be reset on its location parameters.It was done by CR , BG and RV. |
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