Re: [time-nuts] Tektronix FCA3103 ADEV measurement tau setting problem

Actually the CNT-91 and FCA31-3 are the same, the 300 and 400MHz are just claims, both are not very useful above 300MHz but de-rated can measure 400MHz. Cheers; Thomas Knox From: time-nuts on behalf of Björn Sent: Tuesday, May 29, 2018 2:03 PM To:

Re: [time-nuts] New GNSS chipsets

Hi All; I think the real break through is using these different constellations and their different frequencies and looking at carrier phase verses timing elements. This should allow the removal of propagation delay. Cheers; Thomas Knox act...@hotmail.com

[time-nuts] Has anyone played with a SRS FS740?

Hi All; Has anyone had hands on experience with a FS740 or any thoughts in general? Seem like a really nice box. Thanks; Thomas Knox ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Need a Watch Recommendation

I think what makes the IWatch unique is it has an option that makes it a standalone cell phone. With this new option it no longer need to be in proximity of you IPhone. You leave the IPhone at home and have a fully function cell phone on your wrist. The only hitch is they will not let you

Re: [time-nuts] PRS10 Information and help needed

Hi Arnold; If you compare the 10MHz to another standard it will most likely show the quartz is in free run. Since quartz acts as a fly wheel for the rubidium the output would look good from all other aspects (Amplitude and Spectral Purity). So it appear to me you are experiencing an issue with

Re: [time-nuts] Beware the Casio WaveCeptor analog watch

Hi All; I have has a Citizen as well and it has been bullet proof skiing, cycling and such well over five years. I did a quick search because when I purchased it was really pricey but a quick search and Zales has what appears the exact model: Analog Citizen Eco-Drive® Skyhawk Atomic Titanium

[time-nuts] Tourbillon: Recalling and honoring our heritage

e mechanics of a watch escapement. Developed around ... Peace; Tom Knox From: time-nuts <time-nuts-boun...@febo.com> on behalf of Jeremy Nichols <jn6...@gmail.com> Sent: Wednesday, January 3, 2018 9:56 AM To: Discussion of precise time and frequency m

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

hat. Cheers, Magnus On 12/08/2017 06:27 PM, Tom Knox wrote: > Hi All; > > Is the "Aging" generally related to the quartz, or other components? > > Happy-Merry; > > Thomas Knox > > > > > From: time-nuts <time-nu

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

Hi All; Is the "Aging" generally related to the quartz, or other components? Happy-Merry; Thomas Knox From: time-nuts on behalf of Bob kb8tq Sent: Friday, December 8, 2017 9:58 AM To: Discussion of precise time

Re: [time-nuts] Favorite counters (current production)?

The FS740 is interesting. Obviously it has a lot going for it, but what appears to be missing is graphic data display capabilities which would simply be a few line of code. Perhaps I missed something skimming through the manual. And it appears to be a simple L1 receiver, I myself am looking

[time-nuts] Lucent OMQ modules

Has anyone played with the Lucent OMQ Time and frequency Modules? I have seen them with Symmetricom 5Mhz Quartz P/N 106824 - 001 oscillators one of which is currently listed on eBay. Other versions have X72's while some have X72's and Quartz. I believe the 5MHz oscillator are digitally

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

Thomas Knox Sr Test and Measurement Engineer Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 act...@hotmail.com From: time-nuts on behalf of Mark Sims Sent: Wednesday,

Re: [time-nuts] In praise of service: PTF

Thanks, It is a sad sign of the times that in far to many companies as the scientists who founded these companies retire the bean counter take over and the company vectors from a customer driven model to a stock holder driven model. Thankfully there are a few shining examples of "customer

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

s chip a few years ago, but it looks like that source has dried up. Ed On 2017-07-08 10:00 AM, Tom Knox <act...@hotmail.com> wrote: > Hi All; > > Does anyone have a data sheet or experience with the Symmetricom C, I > have one in a Symmetricom 4065C and the internal diagn

[time-nuts] Tuning a Symmetricom 1111C

Hi All; Does anyone have a data sheet or experience with the Symmetricom C, I have one in a Symmetricom 4065C and the internal diagnostics say it is at the end of it's tuning range. Is there a way to do a coarse manual adjustment, or is it a possibility the Cesium is locking to a side

[time-nuts] The future of Telecom Frequency Standard surplus

I think many of us Time-Nuts have played with the wide range of frequency standards surplussed from the Telecom market. My questions is, will the quality of future surplus offerings go up or down as 4G and in the more distant future 5G surplus Frequency Standards hit the market? It seems with

Re: [time-nuts] Datum 1130 10 MHz oscillator

Hi; I thought I had the data sheet but cannot find it. It is very, very similar to the 1000B but has slightly worse Phase Noise specs something like 105dB (5dB worse then the 1000B) @ 1 Hz offset for the 10MHz units. I think it was designed more for telecom use and the 1000B for time and freq.

[time-nuts] Sorry for the unedited post: Counter Internal Oscillator Importance with ExternalReference?

Hi All; I used my speech recognition software last night and reading my post this morning I was embarrassed. Hopefully this email will make sense. Thanks everyone for their input. Tom, i have a question; was there any difference between the two 53230A oscillators when locked to an external

Re: [time-nuts] Looking for a HP-58503 display

I am 99% sure you are correct, it is the same display as the 53131/2A counter. Sadly although in the past I have found and been able to order raw similar displays for product such as the 3458A, after a prolonged search I was never able to find a part number or order the 58503/53132 displays.

Re: [time-nuts] Counter Internal Oscillator Importance with ExternalReference?

Hi All; Thanks for the input. Tom a question, was there any difference between the two 53230A oscillator when locked to an external reference? I have also experienced poor results with my 53230A often showing constant reference errors. Sadly I have several each 53230A's Ultra Stab and

[time-nuts] Counter Internal Oscillator Importance with External Reference?

Hi All; How important is the standard, medium, or high stability reference in counters like the 53230A, or FCA3120 when locked to an ultra low phase noise external reference? Particularly when making measurements and adjustments on other ultra high performance references? I know Agilent sold

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

If it is any help, the 836XXA/B series are all capable of 1Hz resolution but are locked at 1KHz unless you enter the license key for option 008. So it could be software/firmware related. Happy Merry; Thomas Knox From: time-nuts

[time-nuts] Thanks: Lady Heather Version 5 is now available

This seems like an idea time to send my thanks to all involved in the development of Lady Heather as well as the many Time-Nut that have contributed to the advancement and accessibility of the science of Time and Frequency. This thanks goes to all from those scientists I am barely smart enough

Re: [time-nuts] 53132 replacement fan

Hi All; Mouser has more then 200 of the EFB0412MD OEM fans in stock. 10.93 in singles. I have so many fans running in my lab I do not worry much about a little more noise. But a noisy fan is a major concern because of overheating if the fan fails, and although I usually go for an OEM parts in

Re: [time-nuts] 53132 replacement fan

Hi John; The exact part in a 2010 Agilent 53132A is EFB0412MD 12VDC 0.10A Brushless motor. Operating Supply Voltage12 VDC Airflow7.17 CFM Speed6300 RPM Pressure Type5.5 mmAq Bearing TypeBall Noise24 dBA Power Rating0.72 W Housing MaterialPlastic TypeD Height40 mmLength40 mm I have a

Re: [time-nuts] 53132 replacement fan

Hi John; There is a good chance I have the exact fan. I will check later today and let you know. If I do have it I well send you one. At least I should be able to find the Agilent and manufacturer part number . Cheers; Thomas Knox Sr Test and Measurement Engineer Boulder Colorado 80305

[time-nuts] L1 L2 choke Ring Question

I recently purchased a used L1 L2 Choke ring antenna AeroAntenna AT2775-20W-000-05-26-NM, it has an AT2775 aircraft antenna with a 3.3" x 1.8" bolt pattern at it's heart. Sadly the antenna is dead. I have been looking into the possibility of replacing the aircraft antenna portion and was

Re: [time-nuts] 3120A issues

inal Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Knox > Sent: Saturday, June 18, 2016 6:17 PM > To: Time-Nuts > Subject: [time-nuts] 3120A issues > > Does anyone have any insight as to why Microsemi has stopped shipping 3120A > Phas

[time-nuts] 3120A issues

Does anyone have any insight as to why Microsemi has stopped shipping 3120A Phase Noise test sets beside that they are not to spec? Thanks; Thomas Knox ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Slaving ET6000 off external 10MHz

Hi All; Does anyone know if the ET6000 or 9730-6000 can be slaved off and external 10MHz source? I know for example the Microsemi XLI can be locked to an external reference, but cannot find find that function on the 6000 series unit I am playing with. THANKS IN ADVANCE FOR ANY HELP. Thomas

Re: [time-nuts] FTS1050A performance

Actually they are really nice, especially if it has the external 5MHz reference input. For many aspects of Time and Freq related work I do close in Phase Noise is a primary concern. If you ever decide it is not needed let me know I and I am sure many other "Time Nuts" would be interested.

Re: [time-nuts] Owner's Manual and advice for Austron 2110 Disciplined Frequency Standard

Hi Tim; I am a little late to this string, Did you find the information you needed? I do have an Operation and Service Manual in my archive. One thing I have done with these is up grade the LCD to a high contrast LED back lite display. I can send you details on how to do that. My only request

Re: [time-nuts] Jackson Labs M12M Replacement Receiver

In my humble opinion Jackson Labs continues to raise the bar in GPS time and frequency with products that are compact, reasonably price, and most of all offer exceptional performance. Any idea if these will plug and play in my FEI/Zyfer Commsync II"s Thanks All Thomas Knox > Date: Wed, 7

Re: [time-nuts] Rohde & Schwarz GPSDO

What is interesting is I spent a little time on the Manufactures Web Site and could find no AD or PN specs. So even if you can find the down converter antenna, you have no idea how well it will perform. I imagine it has a something like an Oscilloquartz 8663. No doubt as with almost all RS

Re: [time-nuts] Troubleshooting Fluke PM6681

I am not sure if this could be related but I have worked on several of these and found the power supply caps can often be a problem and cause the instrument to display a wide range of issues related to the excess PS noise. This problem is more common with the 6681R which runs a bit hotter.

[time-nuts] Service manual or schematic for 1050A ?

I was wondering if anyone has a service manual or schematic for any generation of the FTS, Datum, Symmetricom, Microsemi 1050A oscillator? I have several of these and although quite old still have state of the art performance, unfortunately I have several with PLL issues. Schematics and

Re: [time-nuts] Current state of optical clocks and the definition of the second

I think the key to this concept is an optical comb filter. Archita Hati of the Phase Noise measurement Group at NIST has been researching ultra low phase noise 5MHz references using an optical standard and comb filter as well as extensive RF components to down converting to the desired

Re: [time-nuts] Any reason not to use one power amplifier and splitter for distribution amplifier?

seen a setup that tries / needs to “distribute” -170 dbc/Hz signals over anything bigger than a rack. I’ve seen *lots* of systems that regenerate those sort of signals many times over (= in many different boxes) to get around distributing them. Bob On Jan 5, 2015, at 2:15 PM, Tom

Re: [time-nuts] Any reason not to use one power amplifier and splitter for distribution amplifier?

Happy New Years All! I have seen a number of discussions on various approaches to distribution amps discussed on Time-Nuts ranging from DYI to products intended for Video. I thought I my weigh in with one point of interest; It seems like long term performance is pretty easy, but a low phase

[time-nuts] Symmetricom/Datum cesium tube interchangeability

Does anyone know if a Symmetricom/Datum cesium tube model 7613a/077 will plug and play in a 4065 clock? Or if not plug and play if they can be used in the 4065 at all. I have a couple 4065's with tired tubes and a fairly fresh 7613A. Thanks; Thomas Knox

[time-nuts] SSR-6Tr vs Lotus M12M

Does anyone have experience with the Synergy SSR-6Tr and the fairly recent Lotus based M12M. It sounds like both are plug and play replacements for the Older M12M's. Both claim improved specs. Both my XLI and FEI Zyfer time and freq rec's use versions of the M12. Does anyone want to weigh in on

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

Hi Is this the right chip: http://www.oemstrade.com/search/STEL-1173%252FCL/ At $65 it is pricy but a bargain if it fixes your clock. Thomas Knox Date: Mon, 5 May 2014 15:14:16 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] Datum 4065A Cs Tube Response

Re: [time-nuts] Symmetricom chip scale atomic clock

Bringing a product as revolutionary as the CSAC at such a low price point is an amazing feat. It would be great if a product launch this innovative could go flawlessly but that is seldom the case. Problems are inevitable, but what defines a company in my humble opinion is how they address a

Re: [time-nuts] Symmetricom chip scale atomic clock

For the sake of discussion let me just add that even if medesigns comments were true of Microsemi, the Microsemi responses on this form have been from long time Time-Nuts who have for years contributed their knowledge to the betterment of the community in the proudest traditions of acadimia.

Re: [time-nuts] Wenzel oscillator - L1 value?

Does adding these filter elements lower Q or affect Phase Noise? Thanks; Thomas Knox From: li...@rtty.us Date: Wed, 23 Apr 2014 17:47:26 -0400 To: time-nuts@febo.com Subject: Re: [time-nuts] Wenzel oscillator - L1 value? Hi Roughly (very roughly) speaking, the series combination of

Re: [time-nuts] hp 54600a and rs-232

This may help: http://cp.literature.agilent.com/litweb/pdf/54652-97004.pdf Thomas Knox From: coll...@navcanada.ca To: time-nuts@febo.com Date: Tue, 22 Apr 2014 07:21:22 -0400 Subject: [time-nuts] hp 54600a and rs-232 While only related to time nuttery in the sense of the hp 54600a

Re: [time-nuts] Software for use HP 82350B gpib card.

The 82350B is not national instruments IEEE488.2 compatible? Thomas Knox From: ct1...@gmail.com To: time-nuts@febo.com Date: Mon, 14 Apr 2014 12:58:08 +0100 Subject: [time-nuts] Software for use HP 82350B gpib card. Hi, I need any software to work with HP5335a or hp 5370B witch work

Re: [time-nuts] Software for use HP 82350B gpib card.

I am not an expert but have used the 82350B with Labview on a regular basis with no problems. Have you installed the Agilent I/O Libraries. Best Wishes; Thomas Knox Date: Mon, 14 Apr 2014 08:21:08 -0700 From: j...@quikus.com To: time-nuts@febo.com Subject: Re: [time-nuts] Software for use

Re: [time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency?

To: time-nuts@febo.com Subject: Re: [time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency? On 4 Apr 2014 08:55, Tom Knox act...@hotmail.com wrote: 90 microns is approx a freq res of about 1 x 3.66 -12 Thomas Knox Since the Doppler shift

Re: [time-nuts] 3.0GHz Channel 3 installation in Agilent 53132A Counter

Jim the 5 and 12.8GHz modules are the same part and the software/firmware set the upper freq limit. I assume at least the 12.8 GHz option must be unlocked/accessed most likely through the key pad. The 5GHz may be plug and play. Thomas Knox From: jsrobb...@earthlink.net Date: Wed, 19 Mar

Re: [time-nuts] 3.0GHz Channel 3 installation in Agilent 53132A counter

I think the solution will be in the firmware. It must be factory set so default is the 5GHz C channel option. The 12GHz option is the same part as the 5GHz sampler with a different firmware lock. Best Wishes; Thomas Knox From: jsrobb...@earthlink.net To: time-nuts@febo.com Date: Tue, 18

Re: [time-nuts] Power Supply for AD9852 / AD9854

I do not know if this is of interest or would be applicable. Wenzel uses their Finesse Voltage Regulator in many products which I may be better described as active noise cancelling regulator. From: albertson.ch...@gmail.com Date: Sat, 15 Mar 2014 22:36:23 -0700 To: t...@patoka.org;

Re: [time-nuts] Power Supply for AD9852 / AD9854

Sorry, I forgot to add the link: http://www.wenzel.com/documents/finesse.html Thomas Knox From: act...@hotmail.com To: time-nuts@febo.com Date: Sun, 16 Mar 2014 09:46:04 -0600 Subject: Re: [time-nuts] Power Supply for AD9852 / AD9854 I do not know if this is of interest or would be

Re: [time-nuts] Mains frequency

So we know there are deviations in line freq. But it seems strange in this era of very accurate and inexpensive freq references. How much is related to the generation? It seems in this era of switching supplies and other complex loads that even if the power were perfect at the generator the

Re: [time-nuts] HP 10811 - 60165 Info Request

1 - BRN Oscillator Return (Com) 2 - RED Oscillator Power (+12V) 3 - ORG Oven Monitor Return (Com) 4 - YEL Oven Monitor Output 5 - GRN Oven Power (+18-24V) 6 - BLU Oven Return (Com) Thomas Knox To: time-nuts@febo.com From: johncr...@aol.com Date: Mon, 10 Mar 2014 14:17:58 -0400 Subject:

Re: [time-nuts] HP 10811 - 60165 Info Request

Thanks to TVB for hosting this manual containing info for most models of the venerable 10811. http://www.leapsecond.com/museum/10811a/10811a.pdf Thomas Knox To: time-nuts@febo.com From: johncr...@aol.com Date: Mon, 10 Mar 2014 14:17:58 -0400 Subject: [time-nuts] HP 10811 - 60165 Info

Re: [time-nuts] HP53131A Fan/Blower

Sorry I have not been following this thread closely. Isn't the fan a fairly standard size? If not what is unique about it? There is a good chance I have a few around. You are welcome to contact me directly act...@hotmail.com Best Wishes; Thomas Knox Date: Thu, 27 Feb 2014 15:35:19 -0800

Re: [time-nuts] A small piece on HP's hydrogen maser in 1968

HP was always a class act, proven by the classic Woody wagons used to transport gear in the photos. Thomas Knox To: time-nuts@febo.com; p...@petelancashire.com From: p...@phk.freebsd.dk Date: Mon, 24 Feb 2014 16:17:23 + Subject: Re: [time-nuts] A small piece on HP's hydrogen maser

Re: [time-nuts] strange behavior of 53230A or is the light on, but nobody in?

, Tom Knox a écrit : Thanks Tom and Bob, I have been thinking of contacting Agilent for some time. I think they are a great company with some good products, but there are a few real blind spots in some current products. I also have seen in the past a genuine interest in listening. I

Re: [time-nuts] strange behavior of 53230A or is the light on, but nobody in?

I have asked Agilent if stock versions of the 53230A and 53132A switched the internal oscillator out of circuit with an Ext Ref signal applied. I thought Agilent's engineer was intentionally vague but said the oscillators were indeed switched out of circuit on the counter with Ext Ref signal

Re: [time-nuts] strange behavior of 53230A or is the light on, but nobody in?

out my old data and send it to you. Maybe as group we can help them fix the problem. /tvb On Feb 18, 2014, at 12:10 AM, Tom Knox act...@hotmail.com wrote: I have asked Agilent if stock versions of the 53230A and 53132A switched the internal oscillator out of circuit with an Ext

[time-nuts] Resistors in VCO

Hi everyone, some VC oscillators I have played with keep trimmer resistor in circuit to adjust the EFC close enough for the PLL to work. I was wondering if changing to more stable resistors could improve ADEV and P/N performance. Also could this add stability if used to divide the loop

Re: [time-nuts] How to open solder-sealed OCXOs?

It has been a long time since I opened one of these, but at the time I remember thinking it must be possible to open one of these without deforming it. Like anything correct technique must be the key. Companies like Wenzel do this on a daily basis and I would guess their technique would include

Re: [time-nuts] Replacement fan in SR620

A little off topic but It seems many instruments (the SR620 and 53132A included) would work best with an internal fan. (A closed system, not exchanging outside air). Possibly with some sort of internal/external heat sink if needed. Or in high power situations outside air would flow through a

Re: [time-nuts] Replacement fan in SR620

On 02/02/14 20:28, Tom Knox wrote: A little off topic but It seems many instruments (the SR620 and 53132A included) would work best with an internal fan. (A closed system, not exchanging outside air). Possibly with some sort of internal/external heat sink if needed. Or in high power

Re: [time-nuts] Replacement fan in SR620

Magnus I have a big collector of fans, mostly for Agilent equipment not that it matters, let me know the dimensions I will see what I have that is quiet. Cheers; Thomas Knox Date: Sat, 1 Feb 2014 18:56:48 +0100 From: mag...@rubidium.dyndns.org To: time-nuts@febo.com Subject: [time-nuts]

Re: [time-nuts] New Acquisition: HP-53132A

I know that with the ovenized oscillator the power supply (and therefore fan) are always on. Thomas Knox Date: Sat, 1 Feb 2014 22:50:13 -0500 From: stanw...@verizon.net To: time-nuts@febo.com Subject: [time-nuts] New Acquisition: HP-53132A Hello The Net, I just got in the counter

Re: [time-nuts] Tom's Adventures of a Time Nut (Banquet Talk)

Tom thanks for your continuing contributions to the science and history of time and frequency. Your passion and knowledge set a high bar for both amateurs and professionals that can help motivate each of us toward our own goals. The ability to both educate and motivate is indeed a rare gift.

Re: [time-nuts] EFC divider resistors

I am not sure if anyone else mentioned this, Placing the parts against the oscillator with a little thermal epoxy under a small piece of foam so they are at least partially ovenized should really help. Thomas Knox From: li...@rtty.us Date: Fri, 31 Jan 2014 22:36:46 -0500 To:

[time-nuts] 1050A Oscillator configuration

Does anyone have experience with Datum 1050A output configurations. I have seen them loaded with everything from 1ea - 1PPS, 100KHz , 1MHz, 5MHz, and 10MHz to 4-10MHz and 1-5MHz to units with just a single 5MHz and 10MHz. I would like to switch one unit to 2-10MHz and 3-5Mhz or even 1-10MHz and

[time-nuts] Tourbillon movement watches

I hope this will fall within the Time-Nuts interested. I recently spend some time with a neighbor who does ornamental machining and cutting of gems. We got into a discussion of time as an art form. He was telling me about a gentleman in South Centeral Colorado that makes his living making a few

[time-nuts] New Symmetricom 1000C oscillator

I noticed today that Symmetricom has upgraded it's venerable 1000B. The 5MHz C model has a premium version with a rated -130dB @ 1Hz offset. I think that is the best rated spec I have seen. Noise floor is a lackluster 160dB @ 100KHz. Sounds like a BVA. The data sheet is at:

[time-nuts] Phase Noise at 5-10Mhz

I was wondering what kind of Phase Noise performance benchmarks Time Nuts have achieved in their labs. I have been rebuilding my Time and Freq test system for the last few years and at times it has been humbling to say the least. I am finally seeing light at the end of the tunnel and seem to

Re: [time-nuts] sysclock source for AD9912 DDS?

Actually the Rohde SMA100A with opt B22 is pretty darn good, and Rick is being a bit humble, the Agilent E8663D is also very good. I hope all member have a happy and prosperous new year. Thomas Knox Date: Tue, 31 Dec 2013 20:01:38 -0800 From: rich...@karlquist.com To:

Re: [time-nuts] Austron

Austron was purchased by Datum which was then purchased by Symmetricom, which was recently sold to Microsemi. Thomas Knox From: j...@westmorelandengineering.com Date: Thu, 26 Dec 2013 17:42:21 -0800 To: time-nuts@febo.com Subject: [time-nuts] Austron Hello Time-Nuts! I hope everyone

Re: [time-nuts] Shortt Clock Recent Measurements

There should be some error if you are to buy into Dr Allan's new gravitational theory. Has anyone attempted to duplicate his experiments concerning high energy density effects on a Shortt Clock? I posted a link to Dr Allan's web site last night on this thread. Thomas Knox From:

Re: [time-nuts] Shortt Clock Recent Measurements

I thought I needed to throw this in the mix. http://www.allanstime.com/Research/Pendulum/index.html Enjoy. Thomas Knox Date: Mon, 9 Dec 2013 17:02:22 -0800 From: bro...@pacific.net To: time-nuts@febo.com Subject: [time-nuts] Shortt Clock Recent Measurements Hi: The Wiki page for

Re: [time-nuts] GPS timing antenna 5 meter BNC Plug with cable

Amazing how reasonable some of these Chinese cables and other electronics are. The quality is also constantly improving. But I would see if they can use at least RG/142. It is more expensive but I would not recommend RG/58 for a GPS antenna. Or even for distributing 5 and 10 MHz outputs if

Re: [time-nuts] Man killed in quartz crystal accident

This quartz crystal accident is a canary in the coal mine that demonstrates how poor safety and regulations often work in the real world. What I feel is a bigger concern is the similar risks we have with our aging Nuclear reactors. Many are over twenty-five years past their intended life. The

Re: [time-nuts] Advice on getting a used Agilent E4432B RF-Generator

Amazing price, is there a gun involved? Thomas Knox To: time-nuts@febo.com From: xne...@luna.dyndns.dk Date: Tue, 19 Nov 2013 16:15:51 + Subject: Re: [time-nuts] Advice on getting a used Agilent E4432B RF-Generator On Tue, 19 Nov 2013 15:44:16 +, cfo wrote: I can get it

Re: [time-nuts] Advice on getting a used Agilent E4432B RF-Generator

...@luna.dyndns.dk wrote: On Tue, 19 Nov 2013 09:35:00 -0700, Tom Knox wrote: Amazing price, is there a gun involved? Thomas Knox No gun , but some previous buys from same seller. And no options installed in the unit. I have just been told that the attenuator is made up of some

Re: [time-nuts] Femtosecond Systems Phase Nosie Stuff

I have the FSS1000E manual, and I recently purchased a new scanner. I may not have the time to scan the entire manual but could easily find time to send any info on the noise source interface and send it to you. That said Tom's option may be better, and the founder of FSS may have all the

Re: [time-nuts] Off Topic Sortof: Board Rework Stations

It is amazing how affordable these rework stations have become. Ten years ago a station like these would cost you thousands of dollars. Thomas Knox Date: Thu, 14 Nov 2013 23:57:49 -0500 To: time-nuts@febo.com From: glennmaill...@bellsouth.net Subject: Re: [time-nuts] Off Topic Sortof:

Re: [time-nuts] Bathys Atomic time wristwatch with Symmetricon SA.45s CASC

I am holding out for the Leapsecond version to be available to the public with low Phase Noise 10MHz, 5MHz, And 1PPS outputs, and the built in adapter with low jitter 44.1KHz and 192KHz outputs for my home entertainment system. Thomas Knox Date: Fri, 8 Nov 2013 17:25:49 + From:

Re: [time-nuts] The 5MHz Sweet Spot

My questions exactly. For the moment I think question 4 may be covered in Archita Hati's paper State-of-the-Art RF Signal Generation From Optical Frequency Division. The other questions are what drives many Time-Nuts I know. Thomas Knox Date: Sun, 3 Nov 2013 03:40:40 +0100 From:

Re: [time-nuts] The 5MHz Sweet Spot

To: time-nuts@febo.com Subject: Re: [time-nuts] The 5MHz Sweet Spot Hi Tom, On Sat, 2 Nov 2013 16:06:06 -0600 Tom Knox act...@hotmail.com wrote: Our house standard F1 a cesium fountain is used roughly one month every few months to characterize roughly 12 5071A cesium standards steering

Re: [time-nuts] The 5MHz Sweet Spot

not be done and why. Bob On Nov 2, 2013, at 8:22 PM, Tom Knox act...@hotmail.com wrote: From reading your past posts I must respect your opinion. Your are obviously extremely educated on the subject. So why is there some disagreement in two very knowledgeable groups

Re: [time-nuts] The 5MHz Sweet Spot

They have crystals so it would seem so. I wonder are the jumps are model, brand, or design dependent and to what degree? Also thanks to everyone contributing their knowledge and experience to the thread. I for one am learning a great deal. I am still interested if anyone has insights to

Re: [time-nuts] The 5MHz Sweet Spot

etc. Just don't expect it to be a few simple rules. Cheers, Magnus On 11/03/2013 10:52 PM, Tom Knox wrote: They have crystals so it would seem so. I wonder are the jumps are model, brand, or design dependent and to what degree? Also thanks to everyone contributing their knowledge

Re: [time-nuts] The 5MHz Sweet Spot

Mike I think we must be talking to the same smart people. I think 5MHz was adopted over 3MHz simply because 5MHz multiplies to other commonly used frequencies with greater ease. I think the top frequency standards have evolved to 5MHz Third Overtone SC cut crystals for a reason. The evolution

Re: [time-nuts] The 5MHz Sweet Spot

: [time-nuts] The 5MHz Sweet Spot Hi The only thing that the 5 MHz 3rd crystal is “optimum” for is a holder that will accept a 0.55” max diameter blank. Bpb On Nov 2, 2013, at 6:06 PM, Tom Knox act...@hotmail.com wrote: Mike I think we must be talking to the same smart people. I think

[time-nuts] The 5MHz Sweet Spot

A while ago I mentioned 5MHz oscillators were used in most metrology applications compared to the more commonly available 10MHz because 5MHz was a sweet spot for quartz. At the time I didn't know why. I finally had a chance to ask the person I learned this from why. The main reason is simply

Re: [time-nuts] Anyone Know What The Models Were In This NIST Paper?

I do not have any say in it but I voiced the groups concerns to a few affiliates at NIST today. One Senior Researcher told me he has been making an effort for some time now to document all the equipment used related to a research project, adding the standard disclaimer that it was not an

Re: [time-nuts] Anyone Know What The Models Were In This NIST Paper?

John the problem is the NIST does not endorse one brand vs another. They go to great lengths to stay neutral. But if knowledge of the products used sheds light on the research it is not a usually a problem. I would say an educated guess the 6 and 8 channel receivers were oncores, and the

Re: [time-nuts] Splitter for GPS antenna suggestions?

I think this discussion could use some parity. Some many options have been presented. But to return to one of the first posts, I would buy a Symmetricom Splitter on eBay. They have really become the industry standard and can be had for a reasonable price. There are certainly products that could

[time-nuts] HP 4193A 4815A probe compatibility?

I hope this is not to far off topic. Does any one know if the 4193A and 4815A probe are physically interchangeable and electronically compatible? If not does anyone know the differences and how to identify which is which? If you feel this is to far off topic please contact me directly. Thanks

Re: [time-nuts] HP 4193A 4815A probe compatibility?

On 2013-10-16 09:15, Tom Knox wrote: I hope this is not to far off topic. Does any one know if the 4193A and 4815A probe are physically interchangeable and electronically compatible? If not does anyone know the differences and how to identify which is which? If you feel this is to far off

Re: [time-nuts] HP 4193A 4815A probe compatibility?

, not a cheap knockoff. Rick Karlquist N6RK On 2013-10-16 09:15, Tom Knox wrote: I hope this is not to far off topic. Does any one know if the 4193A and 4815A probe are physically interchangeable and electronically compatible? If not does anyone know the differences and how to identify

Re: [time-nuts] Need Fluke 6071A synthesizer info

Hi Ed; This may help: http://www.ko4bb.com/Manuals/Fluke/Fluke_6071/Fluke_6071_Service_Manual-1.pdf http://www.davmar.org/Spec/Fluke6070A-spec2.pdf Best Wishes; Thomas Knox Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 Date: Mon, 14 Oct 2013 08:44:12

Re: [time-nuts] A man with two clocks...

It is all a matter of proper placement, now I know you are expecting a tirade on propagation delay and antenna placement and cable length. But actually my thought is to place them far enough apart with the WWV clock in front of your and your GPS at a 12-15 degree angle so it takes 0.2 second to

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