Re: [time-nuts] HP 5372A TIA Question

On 5/31/2018 10:00 AM, "Poul-Henning Kamp" wrote: PS: I do not recall it being mentioned, but the 1 MOhm input pods are horribly unstable compared to the 50 Ohm input pods, which are basically just a stripline and a BNC connector. One thing to note about all the 5372A pods: They should

Re: [time-nuts] Wavecrest DTS2075

On 2018-04-10 8:56 PM, Gerhard Hoffmann wrote: I have been offered a DTS2075. Is this generally regarded as a step forward if you already have a SR620 or is it more or less the same league? Are there any hidden pearls or caveats? TIA and best regards, Gerhard I have the

Re: [time-nuts] Z3801A OCXO manual trimming

On 2018-03-03 3:56 PM, Tom Curlee wrote: What I don't understand is the purpose of what looks like another coil or heater wrapped around the Kapton printed circuit heater stuck to the inner case. This second coil/heater is 2 layers of 1/8" thick red foam wrapped completely around the inner

[time-nuts] Replacement Backup Battery for 5065A?

On 2018-02-26 11:00 AM, Corby wrote: Also I usually remove a battery A2 and install two shottky diodes on the underside of A2s chassis jack. Non-battery units have an A2 that just has these two diodes on it. On mine, I didn't bother with schottky diodes, I just used half of a bridge

Re: [time-nuts] End of Range Oscilloquartz 8600-3

It sounds like yours is different from my 8601. How old is yours? From the label inside it looks like mine is from 1983. Internal pictures are here: http://s701.photobucket.com/user/edpalmer42/library/Oscilloquartz%208601%20Oscillator If you click on 'view as story' you'll see some comments

Re: [time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3

PINGING Mike Monett . Thanks for your off-list offer of assistance with startup of this simulation. Unfortunately, your e4ward.com spam filter is a bit too effective. When I tried to respond to your email, it denied knowing anything about you. Please try again - from a

[time-nuts] Efratom M100 Schematics

As far as I can tell, all online copies of the M100 User Manual are actually the same document. Unfortunately, the schematic and parts placement drawing for the Servo board don't match. For example, the parts placement drawing shows VR2 (voltage regulator) but the schematic doesn't and the

Re: [time-nuts] sine to square wave circuits - performance data?

The "LPRO User's Guide & Integration Guidelines" includes phase noise data for 4 different sine to square converters in Section 3.4. http://www.ko4bb.com/manuals/207.47.238.85/Datum_LPRO_Users_guide1.pdf I used a similar circuit, but to improve performance at 2.5 MHz and 5 MHz, I used 1000 pf

Re: [time-nuts] Datum Cesium Plus (CS PLUS) manuals

Not the manual, just the datasheet. Hope it's useful. https://web.archive.org/web/20030316131651/http://www.datum.com:80/pdfs-ttm/cesium_plus.pdf Ed On 2017-09-02 10:00 AM, Maarten wrote: Hi All, I recently acquired a number of these but don't have any manuals for

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

FYI, a small number of interface boards for the SA22 are available here: www.ebay.com/itm/142461937901 . If you look in the Designer's Reference & User's Guide, it shows the adapter board with and without the heat sink. It has the same connector as the X72, but you don't have to use it!

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

Chris, Are you suggesting reusing the entire cable? I wasn't suggesting that. The cable is over a meter long! Even if the wiring was correct, which it isn't, I don't know if you could pull enough power through those 28 guage wires even though they have multiple leads in parallel. Either

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

I did some more work on the HP printer cable that uses this connector. Here's what I found: 1. Pin 25 on the X72 connector is unconnected. 2. The connector is IDC. It's possible to open it up and add the extra lead, but like all IDC connectors, it's rather fragile. 3. Of the 25 leads in

Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

Chris, One source of that connector is an HP C8231A cable for a Deskjet 450. It's used to connect the printer to a DB-25 parallel port. The connector fits the X72, but there are only 25 leads in the cable. I haven't tried to use it so I don't know if the missing lead is important or not.

Re: [time-nuts] Tuning a Symmetricom 1111C

On 2017-07-10 10:00 AM, Tom Knox wrote: Hi Ed; Thanks for the response. Great logic/detail on potential issues and solutions. The power supply issue seems completely intermittent and when running may be completely fine. That said I am leaning toward the power supply being

Re: [time-nuts] Tuning a Symmetricom 1111C

Hi Tom, I have a Datum 4065A standard with a Datum B oscillator. I've never had to tune it, but it appears to be a clone of the HP 10811 so you might get some insights by researching that oscillator. However, if you're having issues with the +-15V supplies, I'd STRONGLY suggest that you

Re: [time-nuts] HP 5065A High-Res Schematics?

Hi Tom, Yes, I hope to get a hard copy eventually, but even with a hard copy, a good OCRed soft copy is useful. After all, you can't do a search on a hard copy. And if you're away from home, even if just across town, lugging manuals along is rarely appropriate. I'm familiar with Dave's

[time-nuts] HP 5065A High-Res Schematics?

Does anyone have clean high-res one-piece scans of the fold-out pages for the HP 5065A Rb Standard? I'm 'upgrading' my soft copy of the manual with full, edited OCR & bookmarks but the only copies I can find are either low-res or chopped into pieces. I've tried to splice the pieces together,

[time-nuts] Fluke PM6681 'fault' or 'characteristic'?

I was comparing my Sulzer 2.5 to my Efratom FRT and saw something very odd. I don't know if my PM6681 has developed a fault or if I'm just measuring two oscillators that are good enought to show oddities in my measurement system. When the phase of the two signals drifts through zero, the

[time-nuts] Datum FTS-4065A Cesium Standard - Software Bug

I just ran across an amusing bug in the system that runs the front panel display on my FTS-4065A Cesium Standard. You can enter the date and time and then have a display of day:hour:minute:second on the screen. But it wouldn't accept the year. I discovered that you can't enter a year later

Re: [time-nuts] Lost Calibration on CNT-81/PM-6681

Okay, sounds like I completely misinterpreted the clues in the manual. I'll look forward to seeing what you come up with. Ed On 2017-02-02 11:00 AM, Magnus Danielson wrote: Hi Ed, First of all, don't be fooled to think it is "calibrated", not yet. What I've done

Re: [time-nuts] Lost Calibration on CNT-81/PM-6681

measurments look better when averages are on... On Wed, Feb 1, 2017 at 8:46 PM, Ed Palmer<ed_pal...@sasktel.net> wrote: >Hi Magnus, > >When you did your measurements, did you use 'single' mode or 'normal' mode? > >When I got my PM6681, I wanted to check the interpolater to make s

Re: [time-nuts] Lost Calibration on CNT-81/PM-6681

Hi Magnus, When you did your measurements, did you use 'single' mode or 'normal' mode? When I got my PM6681, I wanted to check the interpolater to make sure that it was healthy. I couldn't generate pulses over the whole range, but over the range of 50ns to 28 ns, my StdDev readings in

Re: [time-nuts] Fluke/Pendulum Counters - Rubidium Timebase

for the distribution board. There appears to be enough info in the service manual that figuring out the connections shouldn't be a problem. Ed On 2017-01-17 8:14 AM, Magnus Danielson wrote: Ed, On 01/16/2017 11:01 PM, Ed Palmer wrote: >I have a Fluke PM6681 counter that just has the basic oscillator.

[time-nuts] Fluke/Pendulum Counters - Rubidium Timebase

I have a Fluke PM6681 counter that just has the basic oscillator. I was thinking of upgrading it to the Rubidium timebase. From the service manual, it appears to use an LPRO, but there's nothing obvious regarding heat sinking. Does anyone have pictures of this installation or, at least,

Re: [time-nuts] UCCM GPSDO

The UCCM modules came from Samsung WiMAX radio systems. It looks like they OEM'd the boards from both Trimble and Symmetricom. "UCCM = Universal Core Clock Module" UCCM-P = "Universal Core Clock Module - Plus". I managed to find a system description document that mentions it two or three

Re: [time-nuts] Inside of FT1200-100

What value are you going to change it to? Since the frequency is too low, you probably have to reduce the capacitance somewhere. This one is only 24 pf 5% tolerance. It seems unlikely that this by itself is setting the frequency. It's rather small and the tolerance is rather large. Is

[time-nuts] FTS-1000A Oscillator - Oven mod

I recently bought an unused FTS-1000A Oscillator. My previous experience and Christopher Hoover's recent experience warned me that with time and heat, the red rubber blanket that surrounds the oven will bond the oven assembly to the Dewar flask. It occurred to me that this is the perfect time

Re: [time-nuts] Inside of FT1200-100

On 2016-09-26 10:00 AM, Christopher Hoover wrote: > >You might be able to slide something like a feeler guage down between the >oven and the rubber blanket to break the oscillator free. The oven on mine >is a plain metal cylinder. This way, the rubber sheet should

Re: [time-nuts] Inside of FT1200-100

I had to tear apart an FTS1200 that had a broken Dewar. I had trouble getting it apart because that red rubber sheet was bonded to the glass of the Dewar and the oven. Since the Dewar was smashed anyway, I was able to dig the oscillator out by smashing the Dewar even more. You might be able

Re: [time-nuts] Noisy Sulzer 2.5 - Suggestions?

onquer makes a lot of sense. Ed Lots of possibilities for trouble. But also worth the effort to figure it out. Great old oscillators. Regards Paul WB8TSL On Wed, Aug 17, 2016 at 4:25 PM, Ed Palmer<ed_pal...@sasktel.net> wrote: >I picked up a Sulzer 2.5 (not 2.5A or 2.5B or 2.5C) os

Re: [time-nuts] Noisy Sulzer 2.5 - Suggestions?

capacitors in the oscillator were covered with fuzz on the electrode ends. I am guessing that they were growing a great tin whisker beard. I cleaned it all off, and performance improved greatly. -Chuck Harris Ed Palmer wrote: I picked up a Sulzer 2.5 (not 2.5A or 2.5B or 2.5C) oscillator and 5P power

Re: [time-nuts] Noisy Sulzer 2.5 - Suggestions?

-17 7:03 PM, Bob Camp <kb...@n1k.org> wrote: Hi Let it run for a month before you worry much about measuring what it is doing …. Some (but not all) of those old crystals took a while to settle in. Bob >On Aug 17, 2016, at 4:25 PM, Ed Palmer<ed_pal...@sasktel.net> wrote: > >

Re: [time-nuts] Datum Starloc II GPSDO issues

On 2016-06-29 10:00 AM, Mark Sims wrote: I don't think so. The day and year is there, only the month is 0. The guy selling them has them available in sealed factory case lots. They look new. They are in sealed anti-static bags. My guess is they came from somebody's product line

Re: [time-nuts] Symmetricom SA.35M Information Request

. Is that a dead STEL-1173 I smell? We haven't got to that point yet, but it's on my radar! Ed On 2016-03-15 8:02 PM, Magnus Danielson wrote: Ed, On 03/14/2016 10:10 PM, Ed Palmer wrote: >Does anyone have any info on the Symmetricom SA.35M Miniature Rb >Standard? I have the data sheet, patent do

Re: [time-nuts] Symmetricom SA.35M Information Request

My unit was produced in Aug. 2010 so I don't think warranty is an option. Besides, they'd take a dim view of me removing the top! :) Ed On 2016-03-14 9:01 PM, time-nuts-requ...@febo.com wrote: From: Bob Camp To: Discussion of precise time and frequency measurement

[time-nuts] Symmetricom SA.35M Information Request

Does anyone have any info on the Symmetricom SA.35M Miniature Rb Standard? I have the data sheet, patent document and the MACDEMO program. Is there anything else available? For example, I'd like some more explanation of the various parameters read by the MACDEMO program. I have a sick unit

Re: [time-nuts] GPS jumps of -13.7 us?

Here's what my Z3801A saw using Z38XX. 00:00 on the graph = 06:00 UTC. My location is ~N50, W104. I don't know what SVNs were used. I'm not logging that data. Ed On 2016-01-26 11:00 AM, time-nuts-requ...@febo.com wrote: Message: 3 Date: Tue, 26 Jan 2016 16:12:41 +0100 From: Paul Boven

Re: [time-nuts] STEL-1173/CM Source

On 12/18/2014 11:00 AM, Magnus Danielson wrote: Ed, On 11/15/2014 04:38 PM, Ed Palmer wrote: Yes, I'm sure. I did check the cabling. If I was somehow measuring the Tbolt or 4065A against itself, there wouldn't be any frequency offset. The Oscilloquartz 3210 (which appears to be an OEM'd

Re: [time-nuts] STEL-1173/CM Source

in time interval mode? On Fri, Nov 14, 2014 at 3:26 PM, Ed Palmer ed_pal...@sasktel.net wrote: FYI, I found a source for the PLCC44 version of the STEL-1173 that's used in some Datum FTS Cesium standards. I got mine from here: http://www.aliexpress.com/item/Free-shipping-10PCS-STEL-1173-CM-PLCC

[time-nuts] STEL-1173/CM Source

FYI, I found a source for the PLCC44 version of the STEL-1173 that's used in some Datum FTS Cesium standards. I got mine from here: http://www.aliexpress.com/item/Free-shipping-10PCS-STEL-1173-CM-PLCC/2023682701.html I left positive feedback, not sure why it doesn't show. Shipping was very

Re: [time-nuts] EFC info on Trimble 34310-T OXCO

Hi Charles, I agree with your statement regarding the determination of the optimum time constant, but, as Bob Camp mentioned, temperature change has a significant impact on setting the value. My 'lab' is a non-airconditioned bedroom. My Tbolt doesn't have any active temperature control.

Re: [time-nuts] EFC info on Trimble 34310-T OXCO

Now that I see it again, I think I knew about Miller's Shera version, but I purged it from my brain in horror and disgust. He bought a Z3801A, threw away the controller and added a Shera board. The Shera board is good, but . Ed On 8/23/2014 1:40 PM, Charles Steinmetz wrote: Ed wrote:

Re: [time-nuts] time-nuts Digest, Vol 121, Issue 65

forum was a guy who lives in a ground floor, north-facing condo. He might need to have a disciplined Rb standard due to poor GPS visibility. Ed Thanks, Dave M Message: 5 Date: Fri, 22 Aug 2014 16:19:45 -0600 From: Ed Palmer ed_pal...@sasktel.net To: Discussion of precise time and frequency

Re: [time-nuts] EFC info on Trimble 34310-T OXCO

Have you checked your X72 to see if it has the 1 PPS discipline option? That would be a lot easier (and probably better) than your proposed transplant. Ed On 8/22/2014 12:39 PM, Dave M wrote: Does anyone have any info on the OXCO in the Nortel/Trimble NTBW50AA-17 GPSTM receiver? The OXCO

Re: [time-nuts] Ublox neo-7M GPS

you pay for. No, I'm not associated with Synergy or Jackson labs. So Graham, if you survived the firestorm started by your simple question, are you any wiser? Ed On 8/20/2014 7:56 PM, Tony wrote: On 19/08/2014 16:11, Ed Palmer wrote: Does anyone have a neo-7M and an HP 5371A or a 5372A

Re: [time-nuts] Ublox neo-7M GPS

Paul, How far from the equator are you? The farther you are, the more trouble GPS has measuring your latitude due to worsening geometry. By the way, does anyone know what the timing effects of that will be? Is it documented anywhere? I noticed that the GLONASS satellites have a higher

Re: [time-nuts] Ublox neo-7M GPS

to -17 meters total range Since you're closer to the equator your results should be somewhat better than mine. You could use these numbers to help decide if you've got a problem or not. Ed On 8/21/2014 3:57 PM, Paul wrote: On Thu, Aug 21, 2014 at 4:03 PM, Ed Palmer ed_pal...@sasktel.net wrote

Re: [time-nuts] Ublox neo-7M GPS

16:11, Ed Palmer wrote: Does anyone have a neo-7M and an HP 5371A or a 5372A Analyzer? Use the Histogram Time Interval function to measure a block of samples. That will show the length of the samples with a resolution of 200 ps. That's what I did a couple of years ago when I analyzed

Re: [time-nuts] DIY FE-5680A lobotomy (disable temp compensation)

Is a heatpipe really appropriate for this application? The heatpipe expects that the heat source wants to burn up and so there's lots of heat available to vaporize the liquid in the pipe. It's not clear to me whether that situation exists with these Rb standards. My tests with an FE-5680A

Re: [time-nuts] Ublox neo-7M GPS

Does anyone have a neo-7M and an HP 5371A or a 5372A Analyzer? Use the Histogram Time Interval function to measure a block of samples. That will show the length of the samples with a resolution of 200 ps. That's what I did a couple of years ago when I analyzed the Navsync CW-12 with the old

Re: [time-nuts] Lamp for FRK Rubidium Needed

How did you make the measurement that showed a 0.8 Hz difference? What are the specs on your Racal reference? When was it calibrated and against what standard? That will tell you how much confidence to put in it's frequency. As others have said, an FRK isn't a primary standard and should be

Re: [time-nuts] OT Gel Cell question

As I understand it, the only time that any sealed lead acid battery will vent is in the case of gross overcharging. The battery is designed so that normal charge rates and correct float voltage will result in recombination of any hydrogen and oxygen produced. Was there a fault in the

Re: [time-nuts] OT Gel Cell question

I talked about this earlier today, but my message disappeared along with a second message. Neither made it to the list at all. So out of three messages sent, so far only one made it to the list. Let's see if this one makes it. All UPSs have a problem when trying to figure out what float

Re: [time-nuts] Noise and non-linear behaviour of ferrite transformers

I've seen a few pieces of equipment that use a transformer-coupled output and an isolated BNC jack to break any ground loops. Then they connect the shield to the chassis with a parallel RC network. The C might be in the 1-10 nf range while the R is a few hundred ohms. I know of one piece of

Re: [time-nuts] Setting Windows XP clock.

or something, if it doesn't work anymore. However it's easy to change the NTP server, like Ed Palmer alrady described.-- I think all you need to do is double click on the clock icon Chris Albertson Redondo Beach, California ___ time-nuts mailing

Re: [time-nuts] Setting Windows XP clock.

You don't need an app. 1. Right click on the time display in the task bar. 2. Select 'Adjust Date/Time'. 3. Click on the 'Internet Time' tab. 4. Type in any server you want. I suggest 'us.pool.ntp.org'. This gives you access to a pool of servers so that if one is down or wrong, the next one

Re: [time-nuts] sine to square wave converter

How much of an improvement does the LTC6957 give over, say, a simple 74AC gate? Actually, is there a list of different techniques and the performance of each? I know that the LPRO Integration manual gives some good info for phase noise, but I'm not aware of a similar document for slew rate

Re: [time-nuts] WWVB remodulator update Sent twice but never made it through XX More

Put it on one of the free filesharing sites and post the link. I've used Mediafire.com for that in the past. Ed On 7/4/2014 3:30 PM, paul swed wrote: Happy 4th of July on this Hurricane soaked day to any in the US. I did send the document set out twice this week and I thought it might get

Re: [time-nuts] VNA design

There's a DIY project to build a spectrum analyzer at http://scottyspectrumanalyzer.com . Since it's modular, one version of the project is to add a couple of modules that change it into a network analyzer. If you search ebay for directional couplers, I can almost guarantee that you will

Re: [time-nuts] STEL 1175 vice 1173

Hi Corby, Thanks very much for the offer, but it looks like it would still be a big project to use an '1175 to replace an '1173. I think I'll have to pass. The package difference (PLCC68 vs. PLCC44) would still require a daughterboard of some sort. I've learned a little over the past week

Re: [time-nuts] STEL 1175 vice 1173

/14/2014 06:53 PM, Ed Palmer wrote: Hi Corby, Thanks very much for the offer, but it looks like it would still be a big project to use an '1175 to replace an '1173. I think I'll have to pass. The package difference (PLCC68 vs. PLCC44) would still require a daughterboard of some sort. I've

[time-nuts] Datum 4065A Cs Standard Info?

I realize that this question has been asked before, but it's worth asking again. Has anyone come up with any technical info on any of the 4065A or any of the other 4065 Cesium standards or the 5045A Cs Module that it contains? I have checked the archives and searched extensively through

Re: [time-nuts] Datum 4065A Cs Standard Info?

a modulation scheme similar to the HP 5061A just because it would be interesting to implement my own system. Ed On 5/11/2014 3:30 PM, Magnus Danielson wrote: Ed, On 05/11/2014 08:26 PM, Ed Palmer wrote: I realize that this question has been asked before, but it's worth asking again. Has

Re: [time-nuts] STEL 1173 datasheet

I've been looking for some kind of converter but, so far, I've come up empty. A converter to allow a PLCC44 to be used in place of a DIP is easy to find, but a converter to allow a DIP to be used in place of a PLCC44 is rare, at best. It also occurred to me that signal fidelity (crosstalk,

Re: [time-nuts] STEL 1173 datasheet

Now that looks promising! The show-stopper problem with adapters like Jason found is size. There's only about 20 mm between the circuit board and the top of the case. I can imagine soldering this plug to a board that had either the DIP chip or a ribbon cable to connect it to an FPGA board.

Re: [time-nuts] STEL 1173 datasheet

It's starting to add up, isn't it? The only reason I'm considering it is because I was able to confirm that the Cs tube is alive. If I can get it working for a couple of hundred dollars and some time I think it's a worthwhile project and as Bert Kehren mentioned, I'm not the only one with a

Re: [time-nuts] Datum 4065A Cs Tube Response

don't want to do that conversion! In any case, I have many other toys to amuse me! :) Thanks for all the tips! Ed Good luck. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Monday, May 05, 2014 12:46 AM

Re: [time-nuts] Datum 4065A Cs Tube Response

tube. I'd recommend continuing with the repair. Good luck. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Monday, May 05, 2014 12:46 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts

Re: [time-nuts] Datum 4065A Cs Tube Response

...@febo.com] On Behalf Of Ed Palmer Sent: Monday, May 05, 2014 12:46 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Datum 4065A Cs Tube Response I'm playing with my first Cs standard. It's a Datum 4065A which appears to have a dead STEL-1173 synthesizer. Before I put

Re: [time-nuts] Datum 4065A Cs Tube Response

Hi Magnus, On 5/5/2014 3:30 PM, Magnus Danielson wrote: Ed, On 05/05/2014 10:56 PM, Ed Palmer wrote: Hi Joe, I didn't realize that the info in the 5061A manual was somewhat 'generic'. Thanks for the pointer. On 5/5/2014 6:20 AM, J. L. Trantham wrote: Ed, If I have the math correct

[time-nuts] Datum 4065A Cs Tube Response

I'm playing with my first Cs standard. It's a Datum 4065A which appears to have a dead STEL-1173 synthesizer. Before I put too much effort into replacing that, I thought I'd check the tube and see if it has any life left. I've attached a chart showing the response of the central peak. My

Re: [time-nuts] Influence of Cycle Wraps on TInt-Measurements with53132A

What happens if you use Timelab to analyze the same data instead of Plotter? I find that, depending on the dataset, one program or the other will sometimes have trouble removing the steps completely. They leave small steps behind. It isn't related to the counter used, but seems to be

Re: [time-nuts] Influence of Cycle Wraps on TInt-Measurements with53132A

I've seen similar results with my Racal-Dana 1992 counter. It has trouble measuring time intervals when the inputs are almost in phase. I think there has been discussion in the past about how various counters handle that, but I can't find it right now. Ed On 5/1/2014 10:08 AM, Hans Holzach

[time-nuts] Isotemp OCXO107-10 Internal Photos

FYI, I've posted a few pictures of the inside of this oscillator. Noteworthy is the tiny Dewar flask. http://s701.photobucket.com/user/edpalmer42/library/Isotemp%20OCXO107-10%20Oscillator If you click on the magnifying glass at the bottom of the picture and then do it again, you'll get the

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

The specs that I found here: http://web.archive.org/web/20010302193035/http://www.isotemp.com/ocxo107.htm say the electrical EFC range is 0.1 PPM, but that's for the version with the D/A converter. I can't find any hint about our version. My unit is starting to settle down. Yesterday

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

: In message 531f7161.2080...@sasktel.net, Ed Palmer writes: I just picked up an Isotemp OCXO107-10 Oscillator. I thought it looked like it might be interesting, but it turns out that it's better than I thought. It's got a Dewar flask! I found the specs, but it didn't mention anything about that. So

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

Could be, but I didn't see a good picture of that oscillator. Here's the one I bought: http://www.ebay.com/itm/121264125456?orig_cvip=true Ed On 3/12/2014 1:43 PM, Arthur Dent wrote: Sounds kind of like this oscillator. I found it to be very low power but it took about a week for it to

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

It's hard to see in the picture, but my oscillator is labelled: 0410-2540 Model OCXO107-10 Freq 5.000 MHz S/N6396-40 Notice the same '0410-2540' line. So you're probably right. I wouldn't be surprised to find that Lucent had multiple sources for the oscillator and their part

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

I just picked up an Isotemp OCXO107-10 Oscillator. I thought it looked like it might be interesting, but it turns out that it's better than I thought. It's got a Dewar flask! I found the specs, but it didn't mention anything about that. So, before I let the magic smoke out, does anyone

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

531f7161.2080...@sasktel.net, Ed Palmer writes: I just picked up an Isotemp OCXO107-10 Oscillator. I can't remember which variant the on I have is. I'll check tomorrow. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] FE-5680A sweep range setting

I also have a 5680A with that strange little board. On a hunch, I disconnected the orange wire and injected a DC voltage into the main board. It caused the frequency to change. I don't know if it's the C-field control or another mechanism, but the result is the same. Ed On 2/23/2014 4:01

Re: [time-nuts] How I got my FE-5680A to lock in Sydney, Australia

months when you're using it for something important? Ed On 2/9/2014 6:39 PM, Jamieson (Jim) Rowe wrote: Hi again Magnus, Mark, Tom Harris, Ed Palmer et al, Well, before performing any surgery on my tricky little beasty, I decided to check its frequency swing limits when starting up

Re: [time-nuts] How I got my FE-5680A to lock in Sydney, Australia

Hi Jim, On 2/6/2014 3:32 PM, Jamieson (Jim) Rowe wrote: Hi again folks, You may (or may not) recall that a month or so ago, I asked for any information that might be available regarding how to fix a ‘used’ FE-5680A rubidium module from China (via ebay) which was tested by the supplier in

Re: [time-nuts] Rb as source for ADEV?

Hi Hal, More offset is better, but the actual amount is irrelevent. It's easier to process the difference frequency (i.e. 1 Hz or 10 Hz or whatever) if it's higher. The problem is that low frequency means low slew rate which means trigger noise that will be interpreted as jitter which will

Re: [time-nuts] Z3815A receiver transplant

Hi Morris, You should be able to bridge one of the TTL to RS-232 ports on a MAX232 onto the line from the Z3815A to the GT-8031. This will let you capture the commands the Z3815A sends by using any terminal program. Similarly, if you bridge onto the line from the GT-8031 to the Z3815A you

Re: [time-nuts] Efratom SLCR-101 rubidium - what have I just bought?

Hi Philip, I also have an SLCR and have found almost no info online. Here's the only thing I found: http://web.archive.org/web/2229191126/http://www.datum.com/prod_slcr.html Ed On 12/25/2013 7:18 PM, Philip Pemberton wrote: Hi guys, It seems I must have had a bit too much to drink

Re: [time-nuts] Motorola GPS antenna type GCNT20A3A

On 12/12/2013 1:29 PM, Robert Atkinson wrote: I know Goldmine would not sell duff stuff knowingly, but the Engineering Sample label worries me a little. Often this is indicates a non-functioning item for display or trial fit purposes. Then again it maybe not. I wondered about that as well,

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

Re: [time-nuts] TBolt temperature sensor

It looks like there might be one or two sellers on ebay that still have the old chips. Just make sure to ask what version the chip is before you buy. Ed On 9/11/2013 10:24 AM, Didier Juges wrote: With all that discussion about the old temperature sensor in the TBolt no longer being

Re: [time-nuts] DTS-2077 Very Cool Toy!

: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: 10 September 2013 05:34 To: Discussion of precise time and frequency measurement Subject: [time-nuts] DTS-2077 Very Cool Toy! I fed a 1 GHz sine wave @ 0 dBm into the DTS-2077. I told the DTS to sample

Re: [time-nuts] Wavecrest DTS 2070

Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that

Re: [time-nuts] A day gone awry...

At least I didn't drop it on my foot! :) Ed On 9/9/2013 10:10 AM, Burt I. Weiner wrote: Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my

Re: [time-nuts] Wavecrest DTS 2070

it (of course) Yup. I needed to get at the mounting screws for the cardcage so that I could inspect the motherboard. Ed -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion

Re: [time-nuts] Wavecrest DTS 2070

not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me

Re: [time-nuts] Wavecrest DTS 2070

] On Behalf Of Ed Palmer Sent: Tuesday, 10 September 2013 1:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 2070 Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered

Re: [time-nuts] A day gone awry...

swed wrote: OK I don't get it. When I search for a 2077 I get some online game. Now it makes sense that thats a time sink but generally nothing that will break a tooth. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 12:48 PM, Ed Palmer ed_pal...@sasktel.net wrote: At least I didn't drop it on my foot

Re: [time-nuts] A day gone awry...

, the dishwasher goes on the fritz; fix the dishwasher, and the car won't start - you get the picture... ;-) 73, geo - n4ua On Mon, Sep 9, 2013 at 4:41 PM, Ed Palmer ed_pal...@sasktel.net wrote: It could have been from grinding my teeth in frustration at buying a dead unit! :) My money's on the 'bad luck

Re: [time-nuts] Wavecrest DTS 2070

I used to work for a telephone company. Our big sites had power plants that put out -48V at a few thousand amps. If you dropped a wrench across the buss bars, the wrench disappeared in a puff of smoke and a helluva bang. We were also warned about wearing rings or watches when working on the

[time-nuts] DTS-2077 Very Cool Toy!

I fed a 1 GHz sine wave @ 0 dBm into the DTS-2077. I told the DTS to sample the voltage every 10 ps and dump the data to a file. The attached graph shows the result. The horizontal axis is samples (i.e. increments of 10 ps). The vertical axis is units of 100 uv. I've got a digital scope

Re: [time-nuts] GPS outage?

Bill, did you forget your meds or double up on the dosage or something? ;-) Ed On 9/6/2013 1:07 PM, Bill Hawkins wrote: You bet I'm outraged by GPS causing the death of simpler, more secure systems like Loran. GPS has many ways to fail, but vacuum tube transmitters just required new tubes.

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