Re: [time-nuts] Dual GPSDO - any advantage?

:35 PM (GMT-05:00) To: ewkehren via time-nuts <time-nuts@febo.com> Subject: Re: [time-nuts] Dual GPSDO - any advantage? Bert may I ask how you created the charts (what software are you using).Thank You     On Tuesday, April 10, 2018, 9:04:58 a.m. EDT, ewkehren via time-nuts <time-nuts@

Re: [time-nuts] Dual GPSDO - any advantage?

Jürg will have to explain he is in Switzerland  will be tomorrowBert Sent from my Galaxy Tab® A Original message From: CORNACCHIA via time-nuts <time-nuts@febo.com> Date: 4/10/18 2:35 PM (GMT-05:00) To: ewkehren via time-nuts <time-nuts@febo.com> Subject: Re

Re: [time-nuts] Dual GPSDO - any advantage?

Most likely but PayPal will have to get involved since there are more than one of usBert Kehren Sent from my Galaxy Tab® A Original message From: Clint Jay Date: 4/10/18 10:32 AM (GMT-05:00) To: Discussion of precise time and frequency measurement

Re: [time-nuts] Dual GPSDO - any advantage?

I have run 2 Tbolts from thee same antenna  in to my Tracor and see the corrections are in no way correlated.Bert Kehren Sent from my Galaxy Tab® A Original message From: Florian Teply Date: 4/10/18 7:00 AM (GMT-05:00) To: time-nuts@febo.com Subject: Re:

Re: [time-nuts] Dual GPSDO - any advantage?

Looking at the pictures it is the same unit I bought. It is not dual oven bit trimble works with LH right now shows tracking 10 satelites.Attached  is data that made  me buy a second one for Jürg for $ 129  and one more for me for $9.50.What you see is highly filtered data to see long time

Re: [time-nuts] Dual GPSDO - any advantage?

I bought one too, is a mistake, I am holding my breath  supposedly shipped I previously bought two one for Jürg because it's performance, easier to clean up             Bert Kehren Sent from my Galaxy Tab® A Original message From: donald collie Date:

Re: [time-nuts] Recommendations for Mains Power Monitor / Logger

My 20 year old Junghans`s had no problemBert Kehren Palm City Florida Sent from my Galaxy Tab® A Original message From: Tom Van Baak Date: 3/11/18 8:32 AM (GMT-05:00) To: Discussion of precise time and frequency measurement Subject:

Re: [time-nuts] LT1016 as a pulse shaper...

BruceWisjh I had known about it a week ago and we could have added a board to the A9 order. Next order is probably three weeks away ifIi can help contact me off list     Bert Kehren Sent from my Galaxy Tab® A Original message From: Bruce Griffiths

Re: [time-nuts] LT1016 as a pulse shaper...

We only use three circuits Wenzel sn65ELT35 and LTC6957. For critical applications it is the LTC we refer to it in our designs the Bruce circuit the only problem is solderability, my eyes. Bought 25, to poor to buy junk and not smart  enough to select something less in critical applications.   

Re: [time-nuts] Microsemi up for sale?

The manager many not know but the market does and there have been announcements and the stock is up and for the day the fifth most active of all US markets. At 2 pm #2    Bert Kehren Sent from my Galaxy Tab® A Original message From: "Richard (Rick) Karlquist"

[time-nuts] M12 furono

What is latest on a group buy, have I missed something I am ready to buy        Bert Kehren Sent from my Galaxy Tab® A ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

Re: [time-nuts] FRK

PaulI have never seen a FRK or M 100 that did not have a screw iin lamp but Attila`s unit looks like nothing I have seen before,  I am not a Corby but over time 20 units have passed through my hands       Bert Sent from my Galaxy Tab® A Original message From: paul swed

Re: [time-nuts] FRK

Which one are you talking aboutBert Kehren Sent from my Galaxy Tab® A Original message From: paul swed Date: 2/27/18 9:26 AM (GMT-05:00) To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FRK Thanks

Re: [time-nuts] FRK

Thank you Attila, I have seen many FRK`and M 100 but not one like yours. Some boards are very different and it is very difficult  to get proper documentation.Bert Kehren Sent from my Galaxy Tab® A Original message From: Attila Kinali Date: 2/27/18 5:30 AM

Re: [time-nuts] Replacement A9 boards for the HP 5065A

We have decided to go with the 1012 do we need to do any thing with pin 5Bert kehren Sent from my Galaxy Tab® A Original message From: Attila Kinali Date: 2/26/18 9:53 AM (GMT-05:00) To: Discussion of precise time and frequency measurement

Re: [time-nuts] FRK

l keep it open for a while. Give me a note if this ok for you. Try it. Of course, from time to time I will clean up a bit. Regards, Arnold, DK2WT Am 25.02.2018 um 15:05 schrieb ewkehren via time-nuts: > We have pictures of the guts of a M100 the file is 1.8 M off list or > permission to pos

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

Discooect I have seen them leak all over the placeBert Kehren  Sent from my Galaxy Tab® A Original message From: Stan Date: 2/25/18 2:41 PM (GMT-05:00) To: time-nuts@febo.com Subject: [time-nuts] Replacement Backup Battery for 5065A? With all this

[time-nuts] FRK

We have pictures of the guts of a M100 the file is 1.8 M off list or permission to postBert Kehren  Sent from my Galaxy Tab® A ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Corby is still asleep, on the old board it was 0.5 uF and 100K now 5 uF and 10K. Who knows what HP knew in the 60`s but it works and I dought that it is critical. No where is there any fine  tuning like two resistors in seriesBert Kehren  Sent from my Galaxy Tab® A Original message

Re: [time-nuts] "Super Rubidium" filter mod for PRS-10?

I still stand by FRK, next to HP largest cell, Corby did it with a M 100 much more difficult. I started on a FRK but because of a macular hole in my left eye had to stop.First  test  should be to change time constant and monitor performance.Remember the outstanding performance  of the HP is do

Re: [time-nuts] Curious, how many t-nuts have 5065A

Old color and a little expensive only one partial pictureBert Kehren Sent from my Galaxy Tab® A Original message From: Bob kb8tq Date: 2/24/18 9:30 AM (GMT-05:00) To: George Atkinson , Discussion of precise time and frequency

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

Some  of you are to young to remember when Javanese products were considered junk same storyBert Kehren Sent from my Galaxy Tab® A Original message From: "Van Horn, David" Date: 2/22/18 4:44 PM (GMT-05:00) To: Discussion of precise time

Re: [time-nuts] Curious, how many t-nuts have 5065A

Do not know but it is the holy grail of AV nuts short of a Maser  or 8607Bert Kehren Sent from my Galaxy Tab® A Original message From: Pete Lancashire Date: 2/22/18 9:44 AM (GMT-05:00) To: Discussion of precise time and frequency measurement

Re: [time-nuts] eBay GPS antenna.

Please keep us informed I bought onBert Kehren Sent from my Galaxy Tab® A Original message From: John Green Date: 2/6/18 4:03 PM (GMT-05:00) To: time-nuts@febo.com Subject: Re: [time-nuts] eBay GPS antenna. I kind of have to believe the specs. The two

Re: [time-nuts] Trimble Thunderbolt Issue

Do not toss, first check output of OCXO if good keep if you do not fiend the problem. If no output replace. If L H shows that it works bring OCXO output directly.Bert Kehren  Sent from my Galaxy Tab® A Original message From: Richard Solomon Date: 1/26/18

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox /other?)

The cheapest is not a 5T there are many 6 and 7 for $ 10. T gives you nothing unless you  have saw tooth correctionBerrt Kehren Sent from my Galaxy Tab® A Original message From: Paride Legovini via time-nuts Date: 1/23/18 12:24 PM (GMT-05:00) To:

Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source

Tbolt is a good oneBert Kehren Sent from my Galaxy Tab® A Original message From: David J Taylor via time-nuts Date: 11/1/17 12:07 PM (GMT-05:00) To: time-nuts@febo.com Subject: Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source From: Mark Sims I

Re: [time-nuts] PRS10 PRBB Shematics

The PRS10 was intended as FRS alternative you can use the same plug with no changes on both unitsBert Kehren Sent from my Galaxy Tab® A Original message From: Mark Sims Date: 10/7/17 1:58 PM (GMT-05:00) To: time-nuts@febo.com Subject: [time-nuts] PRS10

Re: [time-nuts] True Position GPSDP + Rb X72

Starting with a 10 second clean up loop for a FEI 5680/GPSDO to now 600 Seconds using Wenzel's j circuit for the Tbolt we have a variety of boards. I am presently out of country but when back will gladly attach some board designs, material cost is minimal  if there is interest.Bert Kehren

Re: [time-nuts] OCXO inside the FEI AN/URQ-23

Thanks I have 2. Will run some tests. In my opinion ADEV does hide changes in Frequency and we see it when we compare ADEV plots with at the same time frequency measurements. We see it with your plots on the Tbolt. The URQ shows frequency specs 2E-12 most likely ADEVBert Sent from my Galaxy

Re: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse

Having  had a fan failure on a well insulated Rb we use a temperature sensor also used for compensation in to a PIC to shut down the systemBert Kehren Sent from my Galaxy Tab® A Original message From: "David G. McGaw" Date: 5/10/17 11:20 PM

Re: [time-nuts] Anyone using UBLOX LEA-M8F for GPSDO?

Neil we  have used M7 and I have boards contact me off list toBert Kehren  Sent from my Galaxy Tab® A Original message From: Neil Smith G4DBN Date: 5/10/17 4:03 PM (GMT-05:00) To: Discussion of precise time and frequency measurement

Re: [time-nuts] hm H Maser

Do we know what the PHM development for Galileo cost? Sent from Samsung tabletBob Camp wrote:Hi > On Jan 10, 2017, at 2:45 AM, Dr. David Kirkby (Kirkby Microwave Ltd) > wrote: > > Once 9 Jan 2017 12:59, "Bob Camp" wrote: >>

Re: [time-nuts] Tbolt issues

Know all that that is why we decided not to do it. Not knowing all the ins and outs and limits of the Tbolts that is why I asked the question to begin with Bert Kehren Sent from Samsung tabletCharles Steinmetz wrote:Bert wrote: > On our to do list was temperature

Re: [time-nuts] FE-5680A software calibration units ?

Depends on who you got it from Sent from Samsung tabletNick Sayer via time-nuts wrote:When I got it, the setting was zero. That suggests to me that the factory tuning was erased, assuming that the factory tunes it the same way - by changing the value adjusted by that

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

Hal there is not one straight answer, as mentioned before these units are intended for commercial applications with large temperature ranges. Most have added frequency compensation using heater current sensing for C field adjustment or in the case of the FE 5680A DDS control. Looking close

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

Charles I agree with every thing you wrote and I am implementing many of your recommendations. Forty years ago I bought a 15 foot Alu channel to make small frequency counter housings, always small, and at the time I did have access to a machine shop so I made end plates. Still have five

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

Bob which Efratom are you talking about? Bert In a message dated 8/24/2014 6:33:12 P.M. Eastern Daylight Time, kb...@n1k.org writes: Hi It is not what is done in the Efratom Rb’s. Their pps input is set up to get things on frequency / on time quickly. The assumption is that you plug it

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

Charles I use double bobble pack inside the Alu channel and I always start out by monitoring the OCXO and make sure it is at least 10 C below the spec range. The tbolt is center located and I use a combination of rubber mounts but suspended that they sell for hard drives and squares of

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

Sorry but I disagree. Having done extensive work with the M7 and M6 in connection with the with GPSDO work we are doing we have characterized the units extensively. First from what we can see the difference between a SSR-6T and a $ 16 M6 is that one has a TCXO and outputs sawtooth

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

Ed We may be talking past each other I had problems with the statement that the basic M6 and M7 are not suitable for GPSDO's. They are not GPSDO's in them self but great GPS engines even without saw tooth correction which is an impossibility since the data is not available. But as you

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

Be patient as soon as we have finished rollout of the FE 5680A and FE 405 B GPSDO I will be off the list. Bert Kehren In a message dated 8/19/2014 9:31:50 P.M. Eastern Daylight Time, csteinm...@yandex.com writes: Bert wrote: I guess time nuts like to talk about it but not fix it.

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

There is no question that direct fan control in combination with a heat sink is the best solution and we use it on FRK and M 100 with proper thermal insulation we get 0.01 C on the back plate and better than 0.1 C on the front. For us the FE 5680 A is not in that class so we looked for a

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

Knowing a litle bit about semiconductor production it is safe to assume that all 7M series divvices have the same chip and during production at ublox some features are disabled or enabled. The result is one mask set one chip run and one inventory. I did see a recent announcement where a 7M

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

I recall when the LEA-M8F was announced that they mentioned a VCTCXO and maybe I wrongly assumed that they used it for sawtooth correction they also mention ability to control in addition an external OCXO. I previously suggested using saw tooth correction information to tune a TCXO but that

[time-nuts] Mc Coy OCXO in HP equipment.

I am presently downsizing and that has also resulted in shrinking my HP 70 000 series spectrum analyzer. Out with the 70310A OCXO reference. The unit has a McCoy OSC92-13B OCXO. The original price was $ 5000 and the option with out OCXO was a $ 2500 saving. Some OCXO. Does any one have any

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

Having had more than ten FRK's and M100's on my bench and once locked none where as low as any thing in E-9. What you should buy is a ubox for $ 16 shipping included and you will with your counter be able to get better than 1 E-9 for testing. Bert Kehren In a message dated 8/10/2014

Re: [time-nuts] temperature sensor

Hi Tom I agre the educational aspect of time nuts is great and I have learned a lot but it would be even more useful if discussions include what can be attained and what may be in the reach of time nuts. I used to have a HP 2804A with matched probe prom only used it once when developing a

Re: [time-nuts] temperature sensor

Slow is not a problem in our applications the loop takes care of that. Will look in to PT 100. Bert Kehren In a message dated 7/21/2014 8:19:48 A.M. Eastern Daylight Time, alex...@ieee.org writes: NTC are not that very stable, they are amorphous material winch could recrystallize

Re: [time-nuts] temperature sensor

Thank you Charles . As a first step I will fill one of my Tbolt boxes with small foam particles. Sounds like a good idea. I have one unit where I have given particular attention to low power from the power supply. Bert Kehren In a message dated 7/21/2014 7:43:49 P.M. Eastern Daylight

Re: [time-nuts] temperature sensor

What I am missing in all these discussions is what do we want to archive or is this an other paper only discussion. I am used to starting out with a goal, and tackle the challenge from there. We have a saying in German Papier ist geduldig. Translate You can write any thing on paper. Bert

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

Bruce, please make those tests it will help me to how to proceed and probably many other time nuts. Bert Kehren In a message dated 7/11/2014 3:50:36 A.M. Eastern Daylight Time, br...@ko4bb.com writes: The Achilles heel of that biasing technique is that the emitter currents of the pair

[time-nuts] sine to square wave converter

As part of the FE 405 B project a separate output circuit is in the works. The universal controller and auxiliary board are the same as used in the FE5680A GPSDO but because of the very low ADEV a separate circuit board that divides by three and has also two ground isolated transformer

[time-nuts] FE 5680A disciplined controller

The development phase of the FE 5680A disciplined controller is nearing its completion in no small part thanks to Scott's work on frequency/ temperature control. As I have pointed out in the past we have no plans to use the 5680 so Juerg is considering selling his FE5680A along with

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

Thank you Alex I have that info I am concerned about rise time Bert Kehren Sent from Samsung tabletAlexander Pummer alex...@ieee.org wrote: look Charles Wenzel's waveform conversion: http://www.wenzel.com/documents/waveform.html 73 Alex On 7/10/2014 11:40 AM, br...@ko4bb.com wrote: On July

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

Magnus Thank you for your recommendation I use Wenzel extensively as a matter of fact I just completed in the last three days two boards that have Wenzel on it and in my projects I can count 14 boards. Rise and fall time is my concern but I am open to suggestions that is why I turned to the

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

Will the added stage negatively effect ADEV? Bert In a message dated 7/10/2014 3:48:44 P.M. Eastern Daylight Time, mag...@rubidium.dyndns.org writes: Bert, OK, good that you are familiar with it, it was not obvious in that message. If you consider it as the first stage, and that you

Re: [time-nuts] Interesting frequency standard project

In the seventies I did for some friends that had FCC First class licenses a counter that on the input had three J/K F/F's to subtract the IF from the LO. They modified receivers including running the IF in to saturation and they certified stations without going there.. I think measurements

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

Good Morning Angus Let me start out by saying the FE5680A project was intended for time nuts and the unit will not be part of our bench, so the work on it is limited. As far as Rb's are concerned our focus is on FRK and HP5065. Looking back I would most likely not suggested it, had I known

[time-nuts] FE 5680A GPSDO update

First let me thank again Scott Newell for all the work he has done. The links included in this post where made possible by Scott. All three exceed the limit of time nuts but will give you a better understanding as to what is going on. First removing the 10 K resistor changes the Rb frequency

[time-nuts] FE 5680A GPSDO update second link problem

Some how a dot snuck in at the end of the second link after the s you can use the old link and delete the dot or use this one http://n5tnl.com/time/fe-5680a/gpsdo/JK5680A_Test35c.xls Sorry about that Bert Kehren ___ time-nuts mailing list --

[time-nuts] Ulrich Bangert

After talking with Hartmut off list and finding out that no family lives close by I decided to send this letter shown below in German, hand written on German condolence stationary to his neighbor and friend. The English translation is below. Sehr geehrte Herr Hackfeld, Als Erstes möchte

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

Because the 96K attachment needs moderator approval I am sending it again without attachment. It is the one I posted before and shows clearly the frequency jumps. So here is the rest of it. Magnus Sorry but I disagree with your statement. First and foremost we have to accept that these

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

Thanks Bob for putting it in perspective, 0.05 C is very doable, looks like it is also used in some OCXO's. Bert Kehren PS on a related subject I just pulled PROCEEDINGS OF THE ANNUAL SYMPOSIUM ON FREQUENCY CONLTROL ATLANTIC CITY in the late 70's did attend a few because of my involvement

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

I can only answer some of your questions. The tuning word is modified by the temperature but if it came back to the same oven current it will again have the same tuning word to the DDS. Since we have not fount a temperature sensor they most likely use oven current that Bob mentioned. If you

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

Will someone beside us use heat pipe. Would love to have an impendent input. What does it take to get a test going. Scott has done a lot of work, how about some one else step up to the plate. There are a lot of time nuts out there with the 5680A,many for the first time will have a very good

[time-nuts] FE 5680 A GPSDO (frequency control)

I probably should have called it more correctly frequency control. Thanks to the help from Scott N5TNL we clearly where able to watch the DDS as fan cooling was added and removed from the Rb. Only a small change resulted in the DDS tuning word changing by 89 which is a frequency change of 6

[time-nuts] FE5680 GPS Disciplined Controller Update

The response has been very positive such that a $ 45 kit is doable. Working on getting at least two beta tests lined up. However it is disappointing that no one has stepped up to tackle the temperature problem. how many have looked at the temperature attachment and clicked on the N5TNL link.

Re: [time-nuts] FE5680 GPS Disciplined Controller Update

Again we are talking past each other I am talking about temperature compensation with the DDS that ideally should be removed. Those steps upset any loop. Bert In a message dated 6/24/2014 6:38:48 P.M. Eastern Daylight Time, hol...@hotmail.com writes: Check out the temperature control

Re: [time-nuts] FE5680 GPS Disciplined Controller Update

Lets be clear the 1 E-13 is a totally different project and does not relate to the FE 5680 A. Yes most likely we will use the same universal controller but with different code, same board. GPS crosses the 1 E-13 line at 10 seconds little more than a day. I whish it was just temperature

Re: [time-nuts] temperature sensor

We use NTC 10K with the FRK. Precision is not important.We have to play with the settings in order to have fan starting voltage over the full temp. range. Bert Kehren In a message dated 6/24/2014 8:12:45 P.M. Eastern Daylight Time, shali...@gmail.com writes: After having tried just

Re: [time-nuts] Sad news Ulrich Bangert

It is a shock and a loss not just to time nuts but many others that where touched and benefited from him. Like in the case of Brooks I know what I will do and I urge those of you that knew him through any type of contact make the old fashioned proper thing by sending his wife a letter or

Re: [time-nuts] HP E3610A Power supply

Paul we need to talk about 405 many things happening. I will be out from 11 till 3 otherwise at home. Bert In a message dated 6/18/2014 10:41:32 P.M. Eastern Daylight Time, paulsw...@gmail.com writes: Bert just finding out that google mail is treating your emails as spam! Not sure if

Re: [time-nuts] FE5680 GPS Disciplined Controller

Tom I am not concerned having followed the discussions lets see what comes from it. Based on the response, we will have our hands full. Let me make clear I take credit for instigating it but it involved five people that at this time have chosen not to be mentioned. Bert. In a message

[time-nuts] Ublox 7

Having used lately ublox 6M for GPSDO work I decided to buy a couple of MAX 7C's on ebay for $ 16.00 181293242043 Super results. We are going to do some saw tooth analysis but most likely will not post them because the deterioration of the list has resulted in many on the real time nuts

Re: [time-nuts] Ublox 7

Don I will continue to be part of the list but am frustrated with the loss of some of the best we used to have and I do not consider my self one of them, but I learned immensely from then. I am not the only one with that opinion looking at the number of responses I am getting. I do not know

Re: [time-nuts] Ublox 7

There have been a couple of questions on and off list. as to the specific listing. I did forget to mention one thing. The unit comes with a built in antenna. For time application not exactly what we want Not easy to take off since it is a block of ceramic with a pin through the center with

[time-nuts] HP E3610A Power supply

This may be off topic but I did check with Tom and many time nuts may have HP E3610A power supplies on their bench and mine smoked a ublox GPS so that makes it topic related.. The reference section has some 1 uF 50V capacitors and in my unit one shorted. The reference section has fuses on

Re: [time-nuts] HP E3610A Power supply

Brooke NO Bert In a message dated 5/22/2014 3:12:56 P.M. Eastern Daylight Time, bro...@pacific.net writes: Hi Bert: My E3617A has a front panel adjustment screw for Over Voltage Protection. Does the E3610 have that? http://www.prc68.com/I/Capacitors.shtml#SupCMeas Have Fun, Brooke

Re: [time-nuts] OT - Need a German speaker

Joe I am German living in the US. The site does ship to the US and once the product is available middle June If necessary I will be glad to help. How ever we have time nuts living in Germany and some probably have bought from this site. They can log in and find out what then payment options

Re: [time-nuts] Can (will) a M12+T generate a negative sawtooth message ?

I think there is confusion between where there is a negative delay. Yes the M12 can have a negative value but in order to correct for the full range of the saw tooth at zero the DS chip has to add 128 nsec delay plus the zero value. Depending on the message it ads or subtracts from that

Re: [time-nuts] Can (will) a M12+T generate a negative sawtooth message ?

The question is what is the definition on time. Yes it will be always 140 nsec late to what the M12 calls zero. Good for a GPSDO. How ever if you want it to relate to NIST time more hardware is needed unless you can compensate that 140 nsec in antenna delay. A simple solution would be a

[time-nuts] FTS 1200 transistor replacement

Traced the problem of my FTS 1200 to the first BC109 Transistor on the A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor low noise is critical. This unit is at least 30 years old and my question is, what transistor will have even lower noise than the than low noise

Re: [time-nuts] FTS 1200 transistor replacement

Thanks for all the help. I do have a couple of BC 109 but I thought with all the work to carefully disassemble the unit that after 30 years there would be a better transistor. Thanks again Bert Kehren In a message dated 5/17/2014 6:47:55 P.M. Eastern Daylight Time, csteinm...@yandex.com

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

The original price of the STEL1173CL was $ 125 in quantity 10 so $ 65 is a bargain. I have no idea as to how it is used in the 4065A but if it is limited to 13 frequencies it may be worth wile to take a look at the AD 9913 it is capable to produce very precise frequencies exceeding its 32

Re: [time-nuts] Low cost GPS module for 100ns timestamping error

I am not advertising for DX but I have bought 4 with good results and their units have a 5 V regulator on it. Some have even a TTL to RS converter on board. Bert Kehren In a message dated 5/2/2014 11:40:47 P.M. Eastern Daylight Time, tn...@toneh.demon.co.uk writes: On 03/05/2014 00:59,

Re: [time-nuts] Low cost GPS module for 100ns timestamping error

Tony There seem to be many variables. Cost, power, how many, overall stability etc. Most likely you will find that the GPS module is not the most expensive part but the VCXO. It also makes a large difference if it is one off or a larger volume is needed. You can always find a bargain, and

Re: [time-nuts] Low cost GPS module for 100ns timestamping error

Welcome to the nuts Tony You are not specifying exactly how accurate time has to be but in my book and based on tests the most reasonable priced GPS with 1 pps is a Ublox 6M that you can get with antenna for less than $ 22 antenna included from _www.DX.com_ (http://www.DX.com) . They have

Re: [time-nuts] Rb vs.Crystal OCXO

The thunderbolt is one of the best timing devices but not for frequency, if you want high resolution. Over time it is ok but high resolution short gate times and you see the frequency changes. They use the OCXO to correct for timing error and if you have a Tracor 527E you can see it. Also

Re: [time-nuts] New timing receivers?

And quite a few companies use them. In a message dated 4/26/2014 8:27:57 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi There are a number of timing receivers on the market. They still are a very small percentage of the total units sold. A lot of people play with the uBlox parts.

Re: [time-nuts] How to accurately measure an oscillator's temperature.

Chris I am not sure if you want to measure temperature or control a fan. To measure there are many options depending on how much money you want to spend. To control I suggest either a LM 335 or a NTC resistor. I have worked extensively with both and for measuring I have now downsized to a

Re: [time-nuts] Looking for GPSDO for home use

Having done extensive testing on the ublox 6M that you can buy with antenna for less than $ 23 new from DX.com I can say with certainty that the 1 Hz pulse is better than 1 E-9 accurate, closer to E-10. Depending on the counter it could be used to adjust a frequency counter to that accuracy.

Re: [time-nuts] GPS antenna in silicon/RTV encapsulation

The Gerber Baby Food Jar at Wall Mart $ 0.49 In a message dated 4/15/2014 1:03:40 P.M. Eastern Daylight Time, jim...@earthlink.net writes: On 4/15/14, 8:13 AM, ewkeh...@aol.com wrote: Working off list on a super high performance GPSDO but low cost thanks to a time nut (sorry forgot

Re: [time-nuts] GPS antenna in silicon/RTV encapsulation

Having five GPSDO's running and some for over 14 years I have a very sophisticated and expensive antenna system. This is part of a project that with the disappearance of Tbolts and other commercial GPSDO's to make available to time nuts state of the art performance at an affordable price,

Re: [time-nuts] GPS antenna in silicon/RTV encapsulation

Washed all three down the sink Bert Kehren In a message dated 4/15/2014 3:18:34 P.M. Eastern Daylight Time, jim...@earthlink.net writes: On 4/15/14, 11:02 AM, ewkeh...@aol.com wrote: The Gerber Baby Food Jar at Wall Mart $ 0.49 Is there a particular kind of food that works best?

[time-nuts] GPS antenna in silicon/RTV encapsulation

Am experimenting with small low cost GPS antennas and am considering as an alternative RTV/silicon. Any information on RF attenuation of RTV/silicon at 1.6 GHz ? Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] FEI-5660 Rubidium Oscillator

All Rb's have XO's and with the exception of the HP5065C all Rb's influence long term stability only the only exception is the HP which uses a TC below 0.1.sec, and as Corbe demonstrated ADEV is controlled below 1 sec. by the cell. The same can not be said with other Rb's. Bert Kehren

Re: [time-nuts] Using GPS to Fine Tune a Rubidium Frequency Standard.

The QEX unit is a spin off of the Shera, how ever the DAC is only 12 bits covering the full tuning range of the Rb. Shera does it better with 18 bits and has additional features. I would not spend the money to get a copy. Bert Kehren In a message dated 3/28/2014 2:42:55 P.M. Eastern

Re: [time-nuts] Hanging bridge question

The lowest cost solution is a DS chip in combination with a PIC. How ever has any one thought about a fix by going to the source of the problem. The TCXO. Use a DDS with internal multiplier like the AD9851 or AD 9913 and use the sawtooth message from the GRS receiver and change the

Re: [time-nuts] Hanging bridge question

Yes if you want to use it only in a GPSDO and it is being done but if you are a time nut you may want the 1 PPS.. Bert Kehren In a message dated 3/25/2014 6:33:12 P.M. Eastern Daylight Time, albertson.ch...@gmail.com writes: On Tue, Mar 25, 2014 at 5:44 AM, ewkeh...@aol.com wrote: The

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