[time-nuts] HP 53131A Power Off Mod

2018-06-03 Thread Arthur Dent
I had also modified my HP 53132A but kept it extra simple and the modification allows me to use the counter normally.. On my HP 53132A I just mounted a toggle switch in one of the unused holes for the back panel BNC input connectors and wired the switch in series with the power connector. The

[time-nuts] Looking for some Frequency Electronics info....

2018-02-19 Thread Arthur Dent
Some time ago bought one on Ebay for under $50 just because it looked interesting. It isn't a prototype but most of the FEI units probably had limited production. It seemed to be more complicated than I expected it to be but if I understood it better it would make more sense. The 10Mhz board is

[time-nuts] Looking for a cheap low tempco EFC pot

2018-01-18 Thread Arthur Dent
It may not be the best way but what I do with an LPRO is use a 10-turn pot and set it to the center of its range then adjust the internal pot to give me an output of 10 Mhz. Basically that gives me a voltage divider where the top and bottom resistors have the same TC so the offsets pretty much

[time-nuts] Identify RFTGM-II-XO Part

2018-01-10 Thread Arthur Dent
If I recall there are 2 MMIC chips, the large one you mention (U105) and a smaller black plastic one (U100) to the left of the big one and to the right of the 15 Mhz crystal filter. Just above the chips you will see 2 inductors marked L101 and L102 that supply the d.c. power to the chips. The

[time-nuts] Absolute phase

2017-11-17 Thread Arthur Dent
I have 2 antennas mounted on opposite ends of a roof and both of them feed commercial GPS DA/splitters and I can have as many as 10 receivers running at one time for testing. I have also used one of the high frequency type F TV passive splitters with one D.C. feed through and added 200-300 ohm

[time-nuts] Thunderbolt question

2017-08-05 Thread Arthur Dent
Pin 1= 0v Pin 2= 0v Pin 3= 0.749V Pin 4= 4.892v Pin 5= 0v Pin 6= 3.417v I’d say it would be an MMIC amp similar to this device. It has the same pin-out so it is a possibility. The Amp In my newer version is an 23 db gain device but 8-pin so I Suspect your version may have similar specs. Here

[time-nuts] Thunderbolt question

2017-08-04 Thread Arthur Dent
Actually that isn't my photo I linked to but one I just Googled. That is probably a board revision most people don't have but it was the first one I saw so I used it just to show that the GPS receiver is part of the only circuit board and not another easily replaceable board like in some other

[time-nuts] Thunderbolt question

2017-08-04 Thread Arthur Dent
The Thunderbolt is a single board with the GPS receiver in the lower right between the oscillator case and the connectors in the photo in this link. https://www.eevblog.com/forum/testgear/trimble-thunderbolt-gps-disciplined-oscillator/?action=dlattach;attach=102948;image

[time-nuts] How get FEI-Zyfer 380 GPSDO to talk with computer?

2017-05-04 Thread Arthur Dent
I have sent a copy of FEI-Zyper GPSMonInstallerV1.14 (2007) to jsrobbins at earthlink.net <time-nuts%40febo.com?Subject=Re%3A%20%5Btime-nuts%5D%20How%20get%20FEI-Zyfer%20380%20GPSDO%20to%20talk%20with%20computer%3F=%3C006c01d2c466%24af60ca30%240e225e90%24%40earthlink.net%3E> -Arthu

[time-nuts] A Symmtricom GPSDO Board

2016-06-05 Thread Arthur Dent
I have two similar Symmetricom GPSDO boards but with a slightly different parts layout that were manufactured in about 2012. The OCXO in the first one is 4.1950 Mhz and there is a 10 Mhz VCO next to it. The second one has a Symmetricom SA22-c Rb oscillator. The large blank spot in question is for

[time-nuts] PRS10 rubidium lamp module failure

2016-05-09 Thread Arthur Dent
..."apparently got hot enough to create a localized thermal runaway in its lead wire." I don't think that explanation is correct. There are no signs of discoloration caused by overheating anywhere else in the photo and yet the lead wire has apparently melted as you say. That would probably

[time-nuts] GPS Outage..

2016-02-26 Thread Arthur Dent
>kb8tq at n1k.org said: Pretty much all of our surplus gizmos are cell tower surplus (like 99.99%). True - I believe all the Trimble Thunderbolts came from Andrew/Grayson/Geometrix WLS2A-24-G or similar Wireless Location Sensors. I know I removed over 200 T-bolts from these units personally.

[time-nuts] Einstein Special on PBS

2015-11-27 Thread Arthur Dent
In the special it looks like they used two HP5071A standards, an SRS620 counter, and a scope. They first made sure the stds were in sync then took one to the building at the top of the ski lift on New Hampshire's Mount Sunapee at 2726' elevation for 4 days where it would be running a little faster

[time-nuts] Einstein Special on PBS

2015-11-27 Thread Arthur Dent
Tom wrote: "I'll make just a one word correction to your summary. The clocks run a bit faster not because of "the spinning earth" but because of "the earth"." You are correct, I misspoke. While that point may have been wrong I did check the elevation of Mount Sunapee and it is indeed at 2726

[time-nuts] 3GHz prescaler for Pendulum counters

2015-11-14 Thread Arthur Dent
Just a note to say that I bought one of these prescaler boards for my CNT-81. One problem is the way the board mounts in the CNT-81 the "in" connector is toward the back instead of toward the front like some of the other counters and I had to make a longer input cable. Pawel does now know this

[time-nuts] Magellan GPS OEM 10 Channel -- Looking for pinout or any documentation

2015-10-16 Thread Arthur Dent
I have sent an email with an attached copy of a PDF file of a similar Magellan 16-pin OEM 5000 receiver to Mariusz. -Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

[time-nuts] Trimble Thunderbolt and David Partridge divider boardquestion

2015-10-12 Thread Arthur Dent
>Tom Van Baak tvb at LeapSecond.com >Mon Oct 12 11:31:17 EDT 2015 > >"For those of you who want to follow the link Chris provided >without his personal google search metadata, the correct URL is: > http://www.perdrix.co.uk/FrequencyDivider/Frequency%20Divider%202.pdf I believe that the link above

[time-nuts] Lucent RTFG-u DE-9 connectors

2015-10-08 Thread Arthur Dent
The connectors are the same but the mounting posts that are tapped for 4-40 screws that are used on two of the connectors are not used on the other DB type connectors and they use a quick disconnect type of post. The mating connector on the cable end has a piece on each side of the connector shell

[time-nuts] Rohde & Schwarz GPSDO

2015-10-07 Thread Arthur Dent
I believe that like a lot of the Meinberg receivers that this uses a down converter to give an IF frequency of 35.4 MHz. If you don't have the converter that apparently isn't included with the receiver you have a $300 paperweight. You might want to check with the seller before bidding. -Arthur

[time-nuts] Trimble GPSDO board

2015-09-13 Thread Arthur Dent
"Arthur, I did read your posts before I composed my email. You made no mention of getting the RS-232 to work.." Again, reread my specific post of Sat Aug 22 11:19:31 EDT 2015 that describes the RS-232 in detail. The green light is also described in one of my posts -Arthur

[time-nuts] Trimble GPSDO board

2015-09-12 Thread Arthur Dent
"Did anyone have any luck in talking to this unit?" Reread my posts that describe what I did. Mine works great. -Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

[time-nuts] Trimble GPS board

2015-08-28 Thread Arthur Dent
Here is an update on the 57964-60 GPSDO board that I bought. After figuring out what it needed for power (it is definitely 5.6-6.0VDV) and communications as I previously posted, I built it into a nice enclosure and fed the 10 Mhz output into my modified Tbolt so I could get a graph of the output.

[time-nuts] Trimble GPS board

2015-08-24 Thread Arthur Dent
Bob Camp wrote: There’s also this listing that shows an pair of 9 pins tacked on the same board: If you look closely that is a daughter board the seller made that is mounted on top of the Trimble board. Some of the listings use the 50-pin ribbon cable connector to connect to some form of interface

[time-nuts] Trimble GPS board

2015-08-22 Thread Arthur Dent
rbenward at verizon.net wrote: See below, here is a 73090 OCXO (same as on some of those GPSDO boards) powered by +12V. You are incorrect in your assumption that the link you have supplied shows a 73090 OCXO powered by +12VDC. The BOARD is indeed powered by 12VDC (or 15VDC if you read the

[time-nuts] Trimble GPS board

2015-08-22 Thread Arthur Dent
Does anyone have any information or experience with this small Trimble GPSDO? I had previously posted that what I thought these boards were and how they might work and said I was waiting for 2 of these boards that I had ordered to arrive. Yesterday the 2 boards arrived in an Epacket from China.

[time-nuts] Trimble GPS board

2015-08-16 Thread Arthur Dent
Does anyone have any information or experience with this small Trimble GPSDO? If you search on Ebay for more of the same GPSDO you will find that there are several sellers offering these units. The units are a Trimble 57963 (x) where x is a revision letter. Some have a different oscillator number

[time-nuts] yet another GPSDO

2015-08-12 Thread Arthur Dent
I made some progress with the Symmetricom CGBA card I bought on Ebay and mentioned here last Friday. After getting it running and checked out, I took a closer look at the board to see if I could communicate with it. What I found was 3 unused holes on the board marked 'USER' and 2 of those pads had

[time-nuts] yet another GPSDO

2015-08-07 Thread Arthur Dent
I picked up yet another version of a GPSDO on Ebay the other day. I thought that I'd mention this because sometimes when one unit shows up there are a lot more that will be listed for sale later, like with the many Lucent RFTG units that are currently being sold on Ebay. This one is a Symmetricom

[time-nuts] Leap Second video

2015-07-01 Thread Arthur Dent
Here is a short video of the leap second compared to a regular clock. http://youtu.be/725ECUOXqeY -Arthur ___ 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

[time-nuts] Tuning a Trimble Thunderbolt

2015-04-22 Thread Arthur Dent
wb6bnq wrote: “I am a little confused. In your screen shot the overdetermined clock says you are at precisely 46.00 North by 7.0 East at 547 Meters.” I think I have the answer. I know when I was selling Tbolts I would PhotoShop out every digit after the decimal point so the displayed

[time-nuts] Trimble Thunderbolt question, splitting its output.

2015-03-27 Thread Arthur Dent
The telco equipment that all these Tbolts came from had the 10 Mhz output feed 2 different modules using a MicroCircuits ZFSC-2-1-S two-way 0° 50 ohm power splitter. There are some of these splitters for sale on Ebay but almost any other similar unit should work.

[time-nuts] OXCO insulation

2015-02-25 Thread Arthur Dent
If you check the popular auction site you can find several listing for Aspen Aerogel SPACELOFT Insulation. One listing has a 10x14x.2 piece for $7 including shipping and another listing has 481 rolls for $1.8 million, in case you have several ovens you need to re-insulate. ;-)

[time-nuts] Another use for a Trimble Thunderbolt

2014-12-25 Thread Arthur Dent
’d say that the plot is telling the truth. It also seems to be giving you information fast enough that thermal drift and barometric pressure is not to big an issue. If you had to wait a day or three for the same data, drift would be a much bigger issue. Yes, when you get to the “close enough”

[time-nuts] Another use for a Trimble Thunderbolt

2014-12-24 Thread Arthur Dent
Those of you who know I had hacked the RFTG-u REF 1 GPS years ago and had one running for 4 years before other time nuts discovered these units probably won't be too surprised that I have tried another hack that may have limited interest but works for me. Having owned a large number of

[time-nuts] Frequency distribution isolation transformers YCL 20F001n arrived

2014-12-14 Thread Arthur Dent
paulswedb at gmail.com Another Time-nut suggested the use of 10 baseT ethernet transformers for 10 MHz isolation that he pulls from old ethernet boards. The 20F001n. These are available from UTSource on ebay at 90 cents each NOS. Ordered 20. Well I have to say as a BPF or something for 10 Mhz

[time-nuts] KS problem

2014-12-10 Thread Arthur Dent
http://evoria.net/AE6RV/KS/KS.Screen.pnghttp://evoria.net/AE6RV/KS/KS.Status.png works better as http://evoria.net/AE6RV/KS/KS.Screen.png http://evoria.net/AE6RV/KS/KS.Status.png -Arthur ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] Nortel Trimble GPSDO

2014-12-09 Thread Arthur Dent
I did miss it. I just did a search and found this thing discussed back in July. Joe Gray W5JG + Search Sept 2013 and you will find the NTBW50AA discussed as well as a NTPB15AA I modified (w/photo link). -Arthur ___ time-nuts

[time-nuts] Lucent KS-24361 15 Mhz and 10 Mhz

2014-12-01 Thread Arthur Dent
I had Planned to eventually convert the 5 Mhz output I added from J8 on the Lucent RFTG-u REF1 (that I described previously) to 10 Mhz. Since I made that 5Mhz modification 4 years ago I have been using the 5 Mhz sinewave output for some of the equipment I have around the bench that can use it

[time-nuts] Minicircuits specs

2014-11-29 Thread Arthur Dent
Here is a link to a pretty exhaustive list of MCL models that would be handy if you only need published specs. -Arthur http://www.minicircuits.com/MCLStore/ModelSearch?model= ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] lightening protection of a GPSDO system / optical isolated distribution amp

2014-11-26 Thread Arthur Dent
Here is a link to a good 12 page description of grounding practices/requirements. http://www.reeve.com/Documents/Articles%20Papers/AntennaSystemGroundingRequirements_Reeve.pdf ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Lucent KS-24361 Web Page

2014-11-21 Thread Arthur Dent
If you refer to the picture of the microprocessor board, you will notice that the locations marked D1, D2 and D3 are populated by zero ohm resistors. That means that the 3 V microcontroller was powered from 5V. I am actually amazed that they worked at all, let alone worked for a while. It is a

[time-nuts] Yet another GPSDO

2014-11-18 Thread Arthur Dent
I just noticed this on Ebay. The seller has several other related items but the pricing is kind of confusing. No a lot of info. http://www.ebay.com/itm/GPS-DISCPLINED-CLOCK-GPSDO-10M-OUTPUT-SQUARE-WAVE-/111514491254 -Arthur ___ time-nuts mailing list

[time-nuts] Yet another GPSDO

2014-11-18 Thread Arthur Dent
You can see a similar product by this seller direct - http://www.cart100.com/seller/bg7tbl/ http://www.cart100.com/Product/38848104218/ Looks like a similar product at almost 3 time the Ebay price. There are more photos at the second link under 'specifications' and you can read MV89A on the

[time-nuts] Z3801 question on EFC at 81000 but stable

2014-11-15 Thread Arthur Dent
I also seem to recall pix of the Z3801 oscillator and there were not any adjustments. I sure hope I missed something. Thanks Paul WB8TSL + There is an adjustment on the inner 10811 oscillator but it isn't easy to get to. Here is a description.

[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

2014-11-05 Thread Arthur Dent
Could someone who has both the REF 0 and REF 1 units check to see if the REF 0 unit has U1 missing. U1 is an AD7849 serial input, 14-Bit/16-Bit DAC on my REF 1 units but is missing on an old REF 0 I just dug out of the to-do pile. Someone may have already mentioned this and I missed it. -Arthur

[time-nuts] NPR Story I heard this morning

2014-11-04 Thread Arthur Dent
Lester Veenstra lester at veenstras.com Tue Nov 4 16:56:29 EST 2014 wrote: And you can get a I climbed Mt. Washington sticker for your clock. +++ It may be a little OT but I actually worked on the summit for the Mount Washington Weather Observatory for 4 winters as well as climbing

[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

2014-11-03 Thread Arthur Dent
GandalfG8 at aol.com GandalfG8 at aol.com Sun Nov 2 09:08:30 EST 2014 wrote: Ooh err, whoops, and oh dear !! Arthur, I've only just had a chance to look at your latest photos, and unless I've really got my wires crossed, if you'll pardon the expression:-), your links on J5 are not shown on pins

[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

2014-11-01 Thread Arthur Dent
Keep in mind that I made the modifications to my RFTG-u REF 1 almost 4 years ago and the details of why I did what I did are kind of foggy today. It was a pure hack but I *believe* that the circuitry as well as the jumpers were required, or at least I thought so. The big problem with getting

[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system

2014-10-31 Thread Arthur Dent
….” ++ Reposting what I had posted over a week ago, in case you missed it…. Arthur Dent golgarfrincham at gmail.com Wed Oct 22 13:59:48 EDT 2014 “…Way back on Fri Jun 11 16:48:43 UTC 2010 I posted about using one of these units I had modified but at the time there wasn't a single person who

[time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup

2014-10-25 Thread Arthur Dent
I can't remember when I initially powered up my RFTG-u REF 1 how long it took to give me the green light but I *believe* it was a long time, maybe the better part of 24 hours. I think after testing and being fustrated I forgot to turn it off one night and the next day things looked normal. I have

[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

2014-10-24 Thread Arthur Dent
Anthony Roby aroby at antamy.com wrote: My curiosity got the better of me so I ordered these earlier this week and received them today. I've powered both up and quickly measured the 10MHz output. I don't yet have a GPS antenna feed that I can connect, so couldn't check that out. And I need to

[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

2014-10-22 Thread Arthur Dent
GandalfG8 at aol.com GandalfG8 at aol.com Wed Oct 22 04:35:40 EDT 2014 Similarly, with this RFTG-u kit I'd be more inclined to look for ways of routing the native 5MHz from the GPS conditioned Milliren 260 series oscillator to the outside world, and to just treat any other use found for the

[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

2014-10-22 Thread Arthur Dent
Oops, photo link didn't make it in my last post http://i906.photobucket.com/albums/ac262/rjb1998/RFTG-uREF1photo1_zps87c505ca.jpg -Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Old 500 kHz oscillator

2014-08-30 Thread Arthur Dent
One of these was my first frequency standard that I used as a marker for checking the calibration of an old Collins TCS-12 receiver I used around 1959. I built a small power supply for the oscillator and used it for a few years until the filament opened and it died. Even way back then I felt that

[time-nuts] Cutler NAA on 24.0kHz....

2014-08-15 Thread Arthur Dent
Not sure whats up with the link when I click it I get the download. Its a 2.5MB file http://www.glkinst.com/test-equipment/manuals/Tracor900A.pdf. The problem with the above link is the period is included as part of the link when you click on it. It will work without the period. -Arthur

[time-nuts] WWVB for Time Nuts

2014-08-13 Thread Arthur Dent
On August 10th Dale J. Robertson wrote: How does patent infringement litigation get started anyway? I would think that the infringement claim would have to be specific i.e. you are infringing on our patent number blah, claims blah, blah, blah blah. not just you are infringing on our patent. you

[time-nuts] Any Isotemp OCXO107-10 Info?

2014-03-12 Thread Arthur Dent
Sounds kind of like this oscillator. I found it to be very low power but it took about a week for it to really settle down and until then I was continually adjusting the EFC. http://i906.photobucket.com/albums/ac262/rjb1998/Oscillator_zps63a30a2f.jpg -Arthur

[time-nuts] Any Isotemp OCXO107-10 Info?

2014-03-12 Thread Arthur Dent
The photo looks like one of the 2 units I have but the info on one if my oscillators says: CTS Knights 970-2074-0    5 Mhz  0410-2540     8947 I'm pretty sure the last numbers are the date code. If more than one company made these units they could have been in some piece of equipment made

[time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillatorboard

2013-12-25 Thread Arthur Dent
quartz55 quartz55 at hughes.net Tue Dec 24 10:06:49 EST 2013 I'd like to see some of your LH traces if you don't mind, especially the osc trace. I don't seem to be able to get my osc trace less than ~400 ppt/div. ++ Here is a 17 hour LH plot of my NTPB15AA 05 which is about the same

[time-nuts] Crude Survey Technique

2013-11-21 Thread Arthur Dent
Brooke Clarke wrote: Most low cost hand held and car GPS receivers can only display direction based on changes in position. True, but the Garmin 62s handheld that I use for geocaching and hiking ($200-$400) has a 3-axis, tilt-compensated electronic compass that shows your heading even when

[time-nuts] powering Trimble Thunderbolt with -5V rather than -12V

2013-10-31 Thread Arthur Dent
Having dismantled a good number of the wireless locator units that these Trimble Thunderbolts were in I can tell you that the DC-DC power supply in these units did not have a -12VDC output but put out -7VDC instead. If I recall the DAC output voltage of almost all the T-bolts I tested was

[time-nuts] TBolt temperature sensor

2013-09-11 Thread Arthur Dent
Didier Juges shalimr9 at gmail.com Wed Sep 11 12:24:51 EDT 2013 With all that discussion about the old temperature sensor in the TBolt no longer being available,... Actually I've bought all mine on Ebay and they are still available from the same seller plus others have some of the old

[time-nuts] New NTBW50AA

2013-09-10 Thread Arthur Dent
Mark Sims holrum at hotmail.com Tue Sep 10 09:03:24 EDT 2013 Again,  THE TEMPERATURE SENSOR IS NOT BROKEN!!  The firmware in some of these units (those from NTPX modules) does NOT  read the temperature sensor in high-res mode. I have sold over 200 T-bolts and had to replace about

[time-nuts] New NTBW50AA

2013-09-10 Thread Arthur Dent
I would say the temp sensor is working, but still why those jumps? Ah, that new temp plot looks like the 'normal' staircase steps I was talking about. The previous plot didn't look right with all the little steps in between. As I mentioned before, and Bob mentioned, any problem with the

[time-nuts] New NTBW50AA

2013-09-09 Thread Arthur Dent
I have a slightly earlier version, or a close cousin, of the NTBW50AA that I modified and I've posted photos of it on this list before: http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15AA05.jpg The LH plot from the NTBW50AA by quartz55 doesn't look quite right. Here is a LH plot from my

[time-nuts] GPS antenna splitter

2013-06-29 Thread Arthur Dent
The amp/splitter I've bought from seller RDR-electronics on Ebay have been Minicircuits ZAPD-3DB-1575-3, 2-way GPS Antenna Splitter N-f. I didn't see any for sale right now but they show up from time to time. See item # 300915251060 to see what they look like. -Arthur

[time-nuts] Z3801 replacement

2013-06-29 Thread Arthur Dent
To answer the question of whether the Nortel/Trimble units will work with Lady Heather, here is a photo of my modified NTPB15AA with the T-bolt monitor built-in. This version I bought from RDR-electronics works fine. http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15AA05.jpg -Arthur

[time-nuts] +12 Volts 1A (plus a bit) supply?

2013-06-27 Thread Arthur Dent
The OCXO in the TBolt has a linear controller. It drops back to about 150 to 250 ma on the +12 line after warmup. It's been at least 40 years since I saw an on/off oven control in production …. Remember that the +12 feeds the oscillator circuit. The more crud on the 12 volts, the worse the

[time-nuts] GPS receivers W/timing outputs greater than 1PP

2013-06-26 Thread Arthur Dent
But do they have a actual website. I did not find one or a webstore? How is it you even knew they had the items?? Thanks Paul I have bought many items from them and have always been satisfied with the items I've bought and their service. They sell on Ebay and that is where their 'store' is. Try

[time-nuts] Thunderbolt GPS APP updates?

2013-06-14 Thread Arthur Dent
The two apparently were manufactured within 3 months of one another. I'd say 9 months. The firmware revision from 2.2 to 3.0 is the 3 months you mentioned and from what I could gather ( which may or may not be correct) mainly changed the algorithm for handling carryover and unless you're

[time-nuts] 9390 GPS RX

2013-05-31 Thread Arthur Dent
On May 24th Mark C. Stephens asked: Does the 9390-5588A have the 16.618 Mhz Vectron oscillator externaly located on one of the wire wrap boards? Well I had to dig it out and open it up to see. Actually I mispoke when I said my 9390 had an FRK, it turned out that was another unit I was thinking

[time-nuts] 9390 GPS RX

2013-05-24 Thread Arthur Dent
I have owned a similar 9390-5588A with the FRK Rb inside for a few years now. Although the Rb is quite old, the unit locks in just 3 minutes and finds the GPS time (off by 1024 weeks, 16 sec, UTC) in four minutes and displays an initial PDOP 03. I have reset the time to the correct UTC time but

[time-nuts] Lady Heather numbers

2013-03-12 Thread Arthur Dent
Garren Davis garren.davis at qlogic.com Tue Mar 12 12:55:48 EDT 2013 I found the 1 ohm resistor from the 12 volt pin to the heater circuit popped off its solder pads and was laying between the insulation and the metal enclosure. ++ You might want to check the 2 photos and

[time-nuts] Interesting looking crystal on ebay

2013-03-07 Thread Arthur Dent
This style of crystal was quite common at one time, and yes, it fits  a valve base but it's for a B7G 7 pin base, not B6G as suggested in the auction. The XTAL is a Bliley BG6 which has nothing to do with the number of pins. The link below is a photo I just took of a Bliley BG6 series with 2

[time-nuts] nteresting looking crystal on ebay

2013-03-07 Thread Arthur Dent
That's one of the better ones - clip mounted. Here's a better view of the innards where you can see the wire from the XTAL to the green support soldered at both ends. Below the support the wires are spot welded. http://i906.photobucket.com/albums/ac262/rjb1998/Blileyxtal2_zps9c0dacb1.jpg

[time-nuts] Nortel EBSCTM-C / NTPB15AB-05

2013-03-02 Thread Arthur Dent
Has anybody traced out the connections on the DB-37 connector on the back of this beast yet? I never looked at the 37-pin connector on the back of the unit but back in December, 2012 I did post that I had added a display and an A.C. supply to the one I had and it seems to be working fine. I

[time-nuts] Lady Heather numbers

2013-02-27 Thread Arthur Dent
There has been a lot of speculation about the innards of the OXCO in the Thunderbolt so here is what I found inside a dead one that I opened. I didn’t trace the circuit out so most of the description that follows is just from a cursory look and may not be totally correct. Below are links to a

[time-nuts] altinex switches

2013-02-21 Thread Arthur Dent
I haven't looked any further but the daughter boards in the unit have 75 ohm resistors which I'm guessing determines the input/output impedance of the unit. If that's the case it should be easy to switch it to 50 ohms although it may not make any real difference. -Arthur

[time-nuts] GPStar Plus: Rubidium, anyone?

2013-02-13 Thread Arthur Dent
Despite what has been previously posted I’ve found my 565s to be very good frequency references for my counters and they seem to compare well to the Thunderbolts. I haven’t run any long term checks but comparing Tbolts to 565s on my scope from time to time I’ve never seen any jumps or

[time-nuts] altinex switches

2013-02-11 Thread Arthur Dent
I just bought the last one at 11:30PM. -Arthur ___ 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] Low noise power supplies?

2013-01-30 Thread Arthur Dent
But the only NiCd I know about are the AA sized ones. I have some of the wet NiCd batteries that are capable of putting out 200A continuously. I'm assuming the internal resistance is pretty low. ;-) Arthur ___ time-nuts mailing list --

[time-nuts] MTI 260 Stability Plot

2013-01-27 Thread Arthur Dent
Has anyone run a stability plot (0-100 or 1000 seconds) on the MTI 260.. There are several sub-models of the 260 in either AT or SC cuts with widely different characteristics. It might help to know which one you have. The ones on the popular auction site may be custom built units. Try checking

[time-nuts] Serial port / Mouse issue (was mentioned inThunderbolt Monitor)

2013-01-25 Thread Arthur Dent
Besides the previous mentioned Time-Nuts reference in this thread to the so-called psychomouse problem on November 1, 2010 there was a thread on November 29, 2011 entitled Unplug T-bolt before booting up...?? that had most of the information covered here. Although this problem has been known

[time-nuts] Interval Timer Recommendation

2013-01-14 Thread Arthur Dent
The manual states that loosing the settings on a 6680 is no big problem , but on the 6681 you loose the interpolator calibtation. And it sounds like that's not a good thing. I didn't know you had to watch out for Battery on a PM6680/81. CFO - Tnut-Beginner Denmark The battery in the 6680

[time-nuts] time-nuts Digest, Vol 101, Issue 152

2012-12-30 Thread Arthur Dent
Bob Camp- A quartz crystal in insensitive to magnetic field. This being Time Nut's that's not the whole story. Ferrite core inductors can indeed exhibit a bit of static mag field sensitivity. Your OCXO may or may not have some in it. Precision crystals have clips made from nickel. The posts

[time-nuts] Nortel NTPB15AA (Trimble) GPSDO

2012-12-11 Thread Arthur Dent
I picked up one of the  Nortel NTPB15AA (Trimble) GPSDO from the common auction site and decided adding a monitor display to the front panel would be a good idea. The entire unit draws about 300ma at 48vdc at power up and there is room inside the case for a small AC power supply. There is

[time-nuts] Thunderbolt oven / non-stable operating temperature

2012-12-10 Thread Arthur Dent
I feel like shouldn't need to fuss with ambient conditions this heavily for an OCXO, and find myself researching construction / design for a DIY outer-oven to wrap the thunderbolt in. Anyone have experience with non-stable temperature on a trimble thunderbolt? The temperature you see is not from

[time-nuts] Thunderbolt oven / non-stable operating temperature

2012-12-10 Thread Arthur Dent
I believe that the high temperature alarm you see is triggered at 50 degrees C.  If that is what you're seeing without artificially raising the temperature of the Thunderbolt by insulating it so it can't radiate the heat, what I said about replacing the chip is correct but if it is staying

[time-nuts] GPSDO Alternatives

2012-12-06 Thread Arthur Dent
On Mon, Dec 4, paul swed wrote: Yes sir $139. But boy I have not seen cheap tbolts in  bit. As I recall $260 these days? On Mon, Dec 3, 2012 at 9:12 PM, Bob Camp lists at rtty.us wrote: Hi The gotcha is that you go from paying surplus prices to paying new prices. New price to new price,

[time-nuts] Z3801 Replacement GPS Receiver Card

2012-09-22 Thread Arthur Dent
The GPS receiver in my Z3801 has died and I need  to replace it. Go to ebay and type oncore in the search box.  There are MANY available starting at just about $20. Search for oncore vp (which is what a z3801a needs), and you won't find ANY, at any price. On Ebay rdr-electronics has a

[time-nuts] 60 Hz line quirks, anybody recognize this stuff?

2012-09-01 Thread Arthur Dent
IMO, you have an instrumentation issue. I don't think the power grid can do anything like that. YMMV, -John I agree. If this was happening on the grid by the time this blip had traveled down the line  to you it would have been so filtered through transformers and other devices and you

[time-nuts] oscillators

2012-08-28 Thread Arthur Dent
I don't know that there is any data showing the TBolt adjusting for aging during holdover. In other words: showing the holdover DAC voltage changing at a completely constant temperature. Bob I haven't seen any data either but here is information from section 5.1.2 of the 2003 Thunderbolt

[time-nuts] newbie question Thunderbolt supply

2012-08-25 Thread Arthur Dent
I think I remember comments about it being used by the DAC.  Wasn't there some mention of the TBolt working with a dead -12 supply, but only as long as the DAC output was above 0. That was the conclusion. Actually the units these Thunderbolts were removed from used -7VDC instead of -12VDC.

[time-nuts] T-Bolt Temperature

2012-08-22 Thread Arthur Dent
Hi: What is the temp chip reading? Is it reading the oven temperature or just the ambient temperature? Ron The DS1620 thermometer chip is in the corner of the pc board next to the RS232 connector and diagonally opposite the OXCO so it reads ambient temperature. -Arthur

[time-nuts] Z3815A Internal SMA 10Mhz Output

2012-08-21 Thread Arthur Dent
Not every GPSDO has a 10MHz OCXO. That is certainly true although from a time-nuts point of view, 10Mhz is certainly a very nice number. I have linked to a photo of both sides of a Trimble 1.5x5 GPSDO built about 2008 that has a 1 square Trimble branded OXCO that has a 76.80Mhz as well

[time-nuts] Thunderbolt GPS and frequency divider loading question

2012-08-16 Thread Arthur Dent
I'd put the distribution amplifier between the TB and the divider Dave The units that these Thunderbolts were removed from solved this problem by feeding the 10Mhz output through a power splitter. One output  from the power splitter went to a 2-way distribution amplifier and the other went to

[time-nuts] T-Bolt Temperature

2012-08-16 Thread Arthur Dent
I have two Thunderbolts that I'm monitoring with Lady Heather.  The temperature on the older unit (MFG 2/26/2004) seems to track the environment.  The newer one (MFG 11-24-2004) shows 44.75 °C and only changes in increments of exactly 1°. All REV-E Thunderbolts with date codes after about

[time-nuts] T-Bolt Temperature

2012-08-16 Thread Arthur Dent
Do you know the part number of a chip to replace the DS1620? The part number is the same, DS1620. What is important is the revision of the DS1620. When Dallas Semiconductor/Maxim 'improved' the chip and went from REV-D (or D2) to REV-E they made a change in the way the data was sent to the

[time-nuts] Morion MV89A pics

2012-06-08 Thread Arthur Dent
I just got an DOXCO made by Frequency Electronics, Inc., so the first thing I did was remove the screws from the outer cover to open it up and check out the insides. Once I removed the foam so I could see the oven, I had the feeling of deja vu. but I'd never owned one of these units before. I

[time-nuts] Morion MV89A pics

2012-06-08 Thread Arthur Dent
Hi I do not believe FE owns Morion. The most certainly own space in the Morion factory. Last time I was there I saw the space. Bob 'Own' may have been too strong a word but FEI is invested in Morion and the FEI site doesn't describe Morion as a wholly-owned subsidiary but one of its 

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