Re: [time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks

2016-05-19 Thread Rex
I just watched it on PBS. Nicely done recreation of your GREAT experiment, Tom. Good to see you had a couple personal appearances, and especially for the final results. Looks like your SR620 counter had a hyperdrive undercarriage lighting option. :-) On 5/17/2016 7:50 PM, Tom Van Baak

Re: [time-nuts] GPSCon for Jackson Labs

2016-03-03 Thread Rex Moncur
Hi Keith Does this version allow one to make use of the 1PPS to give accurate timing of the PC and what timing accuracy do you expect? Rex VK7MO time-nuts mailing list -- To unsubscribe, go to

Re: [time-nuts] MTI 260-0624-D OCXO

2016-02-20 Thread Rex
etic seal, you loose that, but most aren't, anyway. So I just thought I'd mention this other mechanical attack method. I think unsoldering the whole solder seal in one go and pulling it apart without damaging the internals is a pretty difficult task. -Rex On 2/19/2016 9:09 AM, time...@meta

Re: [time-nuts] modification Lucent RFTG

2015-12-14 Thread Rex
;move" and "pad"?) and probably easy to figure out, so probably fine as it is. Just thought I would mention it. Thanks for sharing your Mods. Nicely done. Should be helpful. -Rex On 12/13/2015 1:59 PM, Jörg Logemann wrote: Rex, I made some modifications to my article and I hope, t

Re: [time-nuts] modification Lucent RFTG

2015-12-13 Thread Rex
If you like, I could possibly help make a more readable annotated picture if you can provide me a higher res picture of the board. Just an offer to help if you would consider my suggestions. I think you will see my email in my post. -Rex KK6MK On 12/12/2015 4:39 PM, Jörg Logemann wrote: H

[time-nuts] Centennial Pi Day

2015-03-13 Thread Rex
This is somewhat time related, so... Tomorrow is a centennial Pi Day, since the year is 15. Major local observation times are just before 9:27 AM or PM. 3-14-15 9:26:54 or for time-nuts 9:26:53.589793... (take it as far as you like) Here's one Pi Day web page,

Re: [time-nuts] Motorola Oncore UT+ firmware upgrade backup power questions

2015-03-13 Thread Rex
On UT+ firmware update. I don't think it is possible to update the firmware in a UT+. Back in 2006, time-nuts had a member, Randy Warner, who worked at Synergy. In the message linked here He describes the firmware update as a

Re: [time-nuts] HP 58503A Com 4 conflict

2015-01-05 Thread Rex
You left out a lot of details, like what OS your PC is running, Assuming it is Windows XP or greater, you may be able to juggle the assigned com port. If you are using a USB/serial adapter, be sure it is plugged in so it shows on the devices list. You need to open Device Manager. One way is

Re: [time-nuts] New Years Eve TV countdown

2015-01-01 Thread Rex
TV doesn't seem to care about time sync much these days. It also depends a lot on the path getting to you, I get most of my TV via satellite (Dish network). The receiver I have also can get OTA. I have happened to notice, once, that I had a local channel on two TVs. One was receiving the

Re: [time-nuts] was 10MHz LTE-Lite (Phase Matrix)

2014-11-20 Thread Rex
I had not realized that EIP continued to live on in a different form. Counters even kept the same name on the front panel. On 11/20/2014 2:40 PM, Alex Pummer wrote: they are affordable and good: 585C/588C Frequency Counters

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

2014-11-01 Thread Rex
Here's another reference on driving 10-ish MHz square wave outputs via digital chips. A few years ago I hacked my HP Z3816 to covert its 4 - 19.6608 MHz square wave outputs to be 4 more 10 MHz outputs. In the process I reverse engineered some of what was there. I found each of these outputs

Re: [time-nuts] HOW WE GOT TO NOW WITH STEVEN JOHNSON | Time An Inside Look | PBS

2014-10-25 Thread Rex
grade school level. Most of the interesting stuff was glossed over. I was unimpressed enough that I never watched any of the following shows after those two. Maybe others have other opinions. -Rex On 10/25/2014 11:51 AM, Brooke Clarke wrote: Hi: I don't have TV and wonder if anyone who has PBS

Re: [time-nuts] LTE-Lite Eval Kit available

2014-09-24 Thread Rex
On 24/09/2014 12:16 PM, Dave Martindale wrote: Hello. Please add me to the list of people interested in the LTE-Lite eval kits. (I did not send a previous email, and you did not lose it - I've just been slow in writing). Thanks, Dave On Tue, Sep 23, 2014 at 8:05 PM, S. Jackson via

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

2014-07-20 Thread Rex
On 7/19/2014 6:38 PM, Richard (Rick) Karlquist wrote: Or another way of putting it is you do a bunch of measurements and then construct a theory to explain what you already know experimentally. I like that. Or perhaps, stated another way, in the real world engineers are just as important as

Re: [time-nuts] Synergy-GPS SSR-6tru problems

2014-07-16 Thread Rex
I think your story is rather incomplete. You never (to my deduction) told us what you are plugging this into. You mention a GPSDO so I guess that is where it is plugged while not doing what you want, but you never mention what that GPSDO might be. You blew off Art Sepin's reply as not

Re: [time-nuts] Introduction and info about a Lucent RFTG

2014-07-04 Thread Rex
Several years ago there were a number of these showing up pretty cheap on eBay, so I bought one. As I recall there were a couple of similar versions with some differences so take this recollection with a grain of salt. I did some tracing of the internals on the one I had and found the

Re: [time-nuts] National Standards labs worldwide - specifically Australia

2014-06-30 Thread Rex Moncur
) accredited laboratories. 73 Rex VK7MO ___ time-nuts mailing list -- To unsubscribe, go to and follow the instructions there.

Re: [time-nuts] GPS puck?

2014-06-27 Thread Rex
On 6/26/2014 10:45 PM, David J Taylor wrote: Amazon UK want over $200! A Garmin GPS 18x LVC would be half the price.. Cheers, David The UK Amazon listings are crazy. There's a listing of the USB version at 35 pounds or about $60 (still pretty high) but the only serial version listed

Re: [time-nuts] GPS puck?

2014-06-26 Thread Rex
found Amazon a little cheaper than eBay listings. Serial has a PS-2-style connector but needs an adapter for connection to PC. Connector pin-out is here... -Rex On 6/26/2014 1:59 PM, Tom Van Baak wrote: David

Re: [time-nuts] Weather/units question for European members

2014-05-23 Thread Rex
I have a crappy Chinese-made handheld propeller anemometer. I'm not in Europe but FWIW the output can be selected as: m/s, km/h, ft/min, knots or mph. So, the first two of those seem to be likely metric choices. Your method sounds interesting. Would you be willing to share any details about

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

2014-03-29 Thread Rex
On 3/27/2014 8:47 PM, Mark Sims wrote: Granite tends to be rather radioactive (particularly avoid the pink stuff). Apologies before I begin... He who holds the scintillation detector has a gamma ray-son detre. Paranoia strikes deep into your home it will creep There's a man with a Geiger

Re: [time-nuts] Aircraft ping timing

2014-03-23 Thread Rex Moncur
at around 17:00 UTC on 7 March. The flight No on ADS-B is slightly different and shows as MAS370 rather than MH370. Both are quoted on Flight Radar 24 when you click on the aircraft to see its track.,100.35/6 Regards Rex VK7MO

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

2014-01-31 Thread Rex
If you take the link in the original message (it is a youtube presentation), the player on that page has an option to open the video in Youtube. Anyway, it goes here: On 1/30/2014 8:30 PM, Max Robinson wrote: Tom. Could you give us a link to the u

Re: [time-nuts] 24 hr clock movements...

2014-01-20 Thread Rex
That listing is a bit vague about if it has a second hand. For the kind of pulse drive that has been discussed here, it seems you would want a definite second capability and step vs. smooth second hand drive. I know nothing except a little web searching, but this one seems to have the right

Re: [time-nuts] 24 hr clock movements...

2014-01-20 Thread Rex
I think there is a slight flaw in slowing the drive to half rate. The hour hand could then go around once in 24 hours, but the minute and second hand movement is halved too. Rather non-intuitive to read unless you only put on the hour hand and make a new 24-hour dial face. On 1/20/2014 5:57

Re: [time-nuts] 24 hr clock movements...

2014-01-20 Thread Rex
decipher). On 1/20/2014 4:04 PM, Jim Lux wrote: On 1/20/14 3:32 PM, Rex wrote: That listing is a bit vague about if it has a second hand. For the kind of pulse drive that has been discussed here, it seems you would want a definite second capability and step vs. smooth second hand drive. I know

Re: [time-nuts] Interesting HP oscillators...

2014-01-13 Thread Rex
This document lists that part number... It says (I think -- in a quick scan) that it is mostly the same specs as a 10811 D/E except a narrower EFC tuning range. On 1/13/2014 6:19 PM, Brian, WA1ZMS wrote: I have happened upon a pair of

Re: [time-nuts] Question about the FE-5680A

2013-12-12 Thread Rex
The FE5680A has about ten years of history on time-nuts. The FEI webpage bears little resemblance to most of the units that you will find. I have never seen one with a factory separate connector for oscillator output. Many needed both 15V and 5V to operate. Different versions have outputs for

Re: [time-nuts] Efratom Rubidium SPTB-100/LN-001 info wanted

2013-12-05 Thread Rex
know and I'll correct or update. -Rex KK6MK On 12/4/2013 7:08 PM, Jerome Peters wrote: Hello, Can anybody shed some light on this particular model: Model - SPTB-100/LN-001 Efratom part No. 703-200-11 Date Code 8609 (I have looked at K04BB's website, it has lots of other models

[time-nuts] Coax cable for volute antenna

2013-10-17 Thread Rex
On 10/16/2013 8:26 PM, quartz55 wrote: I've been searching for the small copper hardline I can use for the feed on the gps volute (egg beater) antenna. Can anyone steer me where to get a foot or so of the small 50 ohm line so I can make a few antennas? I've been searching mouser to

Re: [time-nuts] Coax cable for volute antenna

2013-10-16 Thread Rex
I wish you had learned to post a new message, rather than replying to a previous message with an unrelated new subject. (screws up threading displays in mail readers) On 10/16/2013 8:26 PM, quartz55 wrote: I've been searching for the small copper hardline I can use for the feed on the gps

Re: [time-nuts] FTS 4060 Cesium Time Frequency Standard, Datum

2013-10-04 Thread Rex
On 10/4/2013 9:41 AM, Tom Miller wrote: Maybe someone can tell me the best way to search the time-nuts archive. Do you need to download all the files to a common DB? Regards, Tom I usually use this for time-nuts searches...

[time-nuts] Help in Locking a Windows Computer to GPS Time

2013-08-22 Thread Rex Moncur
of the PC. Rex VK7MO ___ time-nuts mailing list -- To unsubscribe, go to and follow the instructions there.

Re: [time-nuts] Help in Locking a Windows Computer to GPS Time

2013-08-22 Thread Rex Moncur
Hi David Yes I did not make myself clear but I am looking for UTC time from a GPS. Thanks for all your references which I will work through and see how I go. Regards Rex VK7MO -Original Message- From: [] On Behalf Of David J

Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?

2013-08-15 Thread Rex
I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I'm not sure of the model number, Lucent had several variations on the same theme

Re: [time-nuts] Removing goop was: =Re: 10811 Outer oven controller schematic

2013-08-01 Thread Rex
On 7/31/2013 7:06 PM, Dr. Edward H. Currie wrote: DW-40 is a good label goop remover ... Does the DW stand for dyslexic writing? :-) Pretty sure you meant WD-40 as in this link... ___ time-nuts mailing list --

Re: [time-nuts] Removing goop was: =Re: 10811 Outer oven controller schematic

2013-08-01 Thread Rex
On 7/31/2013 5:42 PM, Don Latham wrote: Xylene is availble as goof-off in paint departments. Goof-off now seems to be a whole family of products. See... Maybe Heavy Duty Remover or power Cleaner and Degreaser might be the best current options. The one MDS

Re: [time-nuts] 10811 Outer oven controller schematic

2013-07-31 Thread Rex
I suspect by gas he meant gasoline. I don't know about what paint remover he meant but I have another suggestion that might have worked. For cleaning label gunk off of used test equipment I have used automotive bug and tar remover. Seems to loosen up lots of gunk but not so strong it hurts

Re: [time-nuts] RS 232

2013-07-26 Thread Rex
FWIW, it was clear as mud for me too. Bert began with, Since joining time nuts over four years ago I have not used a single MAX 232 chip. Two reasons MAX do not give me isolation and do generate noise in critical applications. From that I took that he was doing RS232 using opto

Re: [time-nuts] The auction site?

2013-07-02 Thread Rex
On 7/1/2013 11:59 PM, Doug Calvert wrote: Hello, Why do people go out of their way to avoid writing ebay on this list? The statements are purposely written so that it is obvious that the insert mystical phrase is ebay and not a generic auction site. What history am I not aware of? I dunno

Re: [time-nuts] What is the deal with

2013-06-18 Thread Rex
___ time-nuts mailing list -- To unsubscribe, go to and follow the instructions there.

Re: [time-nuts] What is the deal with

2013-06-18 Thread Rex
:25 PM, Rex wrote: ___ time-nuts mailing list -- To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list

Re: [time-nuts] WWVB remodulator for the spectracom 8170 the schematic is to large

2013-06-17 Thread Rex
On 6/17/2013 9:52 AM, Chris Albertson wrote: Here is an even smaller version, at the same resolution.The trick is to remove the background. Then all you have is mostly a plank sheet and a small amount of ink that compresses very well. What you do is adjust the contrast until you have only

Re: [time-nuts] Spectracom 8170 Time of Day grief...(WWVB Clock)

2013-06-13 Thread Rex
On 6/13/2013 9:02 AM, J. L. Trantham wrote: However, as a 'modern art' piece, I might have a chance. :^) Joe Like this? Hmm, maybe not. ___ time-nuts mailing list

Re: [time-nuts] Good (cheap) PIC chip choice for project?

2013-05-25 Thread Rex
On 5/25/2013 1:22 PM, Bob Camp wrote: If you are going to code on a cheap PIC (the PIC16 series) you will likely need to learn PIC assembler. All my coding on those parts was in assembly language. They are old enough / slow enough / small RAM enough that things like C (or the other high level

[time-nuts] Checking Time difference between PCs

2013-05-23 Thread Rex Moncur
a program that outputs the PC time as a pulse on a sound card so I can compare these on a CRO. Regards Rex VK7MO ___ time-nuts mailing list -- To unsubscribe, go to and follow

Re: [time-nuts] Precise positions for GPSDOs

2013-05-02 Thread Rex
PHK, the big pdf link in your sneak page is broken (gives 404). Can you fix that for us? P.S., while you are there you could change goory' to gory. On 5/2/2013 5:22 AM, Poul-Henning Kamp wrote: In message, Stewart Cobb

Re: [time-nuts] Time nut newbie

2013-04-30 Thread Rex
It doesn't affect the general magnitude conclusions by Bruce, but as long as we are making corrections, my calculator seems to think 60 * 60 * 24 * 12 = 1036800 seconds in 12 days, not 1024800. That does come out to 115.7 days for 1 sec error. Maybe the 12-day number was a typo? -Rex On 4

Re: [time-nuts] Are there any rubidiums programma to 40 MHz?

2013-03-25 Thread Rex
Please tell us if I am parsing the content of your message correctly with my inserted comments. On 3/25/2013 9:09 AM, Stan, W1LE wrote: Hello Dave, The problem I experienced with a Rb at 10 MHz stabilizing a AD6IW PLL at 106.5 MHz for a DB6NT 10 GHz G2 transverter, I assume by stabilizing

Re: [time-nuts] Win XP and NIST time

2013-03-23 Thread Rex
I'm running Microsoft Windows XP Professional -- Version 5.1.2600 Service Pack 3 Build 2600. I still get occasional notifications and update my OS with latest changes. (Don't know how much longer that will continue.) The time on my system updated OK and is currently correct. I haven't noticed

Re: [time-nuts] Lady Heather numbers

2013-03-12 Thread Rex
Do you think that the oven is working correctly? Is the DC current high on power-up then dropping to a steady lower value after warm-up time? My concern is that the resistors may have unsoldered themselves because the oven ran away into an over-temp condition. On 3/12/2013 9:55 AM, Garren

Re: [time-nuts] frequency reference for portable operation

2013-03-11 Thread Rex
On 3/10/2013 6:10 PM, Hal Murray wrote: said: or if you have a beacon in range that you can find to establish your offset. What do you do after you determine the offset? Do you tweak it out with a trimmer (R or C)? Or tell the software? Or do the corrections with pencil and

Re: [time-nuts] frequency reference for portable operation

2013-03-11 Thread Rex
probably go for that experiment. -- In reality, don't know if I ever will. -Rex On 3/10/2013 5:15 PM, Bob Camp wrote: Hi If you go with one of the better DOCXO's on eBay (spend the full $30 not $15) you should get something that will hold 0.3 ppb for 48 hours. You would have to do a few

Re: [time-nuts] frequency reference for portable operation

2013-03-10 Thread Rex
their mobile microwave rigs. -Rex, KK6MK On 3/10/2013 7:23 AM, Jim Lux wrote: Asking here on behalf of a friend.. With respect to portable amateur microwave operation.. you want good close in phase noise (so you can use narrow band filters) AND good frequency accuracy (so you can find

Re: [time-nuts] PTS 3200 remote programming

2013-03-01 Thread Rex
I looked at a copy of the 3200 manual I found a while ago. I used to have a bunch of PTS stuff on my web pages but was asked by the company to take it down. I think KO4BB manual pages have the same issue. Do you have the manual? It doesn't look like there is anything unexpected in the

Re: [time-nuts] PTS 3200 remote programming

2013-03-01 Thread Rex
If you have a pdf manual, you probably have the same one I have. When I was looking today, I did see that the input pin numbers listed in the table, where it describes the programming (p 29 in the one I have or p32 of the pdf), does not match SCHEMATIC, PE-1121 (figure 7 or p44 of the pdf). I

Re: [time-nuts] Looking for Z3801

2013-02-14 Thread Rex
Here is a Z3816a -- 271152849045 I don't know the seller but has lots of sales. 3816 requires no serial configuration (like 3801) and has two 10 MHz out standard. Several years back I came up with a mod to convert the 4 19...MHz outputs to additional 10 MHz square outputs. --

Re: [time-nuts] altinex switches

2013-02-12 Thread Rex
Yes, this switch matrix seems intended for video signals, so 75 ohms is the expected standard. I doubt that would be much of a problem for 50 ohm timing signals. Some of us shall see soon. BNCs may be 75 ohm versions too, but probably not a big issue. On 2/11/2013 6:20 PM, J. L. Trantham

Re: [time-nuts] FRK-L Rubidium

2013-02-08 Thread Rex
Do you have the service manual? If not, get it here... As I recall there's pretty good trouble shooting in the manual. Several years ago I fixed an FRK-H that wouldn't lock. The crystal osc had drifted enough that the trimmer

Re: [time-nuts] Low noise power supplies?

2013-01-31 Thread Rex
On 1/31/2013 12:20 AM, Bruce Griffiths wrote: With some care its possible to make the emitter current of the shunt transistor approximately PTAT so that, at least for small signals the temperature dependence of the rejection is reduced significantly. Sorry, what does PTAT mean? I'm not

Re: [time-nuts] Interval Timer Recommendation

2013-01-09 Thread Rex
On 1/9/2013 12:48 PM, Azelio Boriani wrote: and don't forget the PM6681 (50pS) The PM6681 was sold by Fluke/Philips. The same counter is also occasionally seen as the Pendulum CNT-81. Additional good features: small, light, and quiet. On Wed, Jan 9, 2013 at 7:29 PM, Magnus

Re: [time-nuts] 10 MHz - 16 MHz clock multiplier

2013-01-05 Thread Rex
On 1/4/2013 4:48 PM, Bob Camp wrote: Hi As I recall the spec was: 1) Cheap 2) no phase slips on the 16 MHz relative to 10 MHz 3) Cheap Bob GAK! Here is the original from TVB What's the simplest way to generate 16 MHz from 10 MHz? This will be for clocking a microcontroller at 16 MHz

Re: [time-nuts] 10 MHz - 16 MHz clock multiplier

2013-01-03 Thread Rex
On 1/3/2013 6:22 PM, David wrote: Alternatively if you just want to divide by 5 or some other small fixed number, you can use a couple of flip-flips and gates. Flip-flips are good for digitally implementing tick-tick clocks, right? :-) (Use flop-flops for tock-tock.)

Re: [time-nuts] Is now the timepod a symmetricom product ?

2012-12-20 Thread Rex
to locate those two spots, that I knew I had read, about Symmetricom picking up John's product. On 12/20/2012 3:21 AM, Timeok wrote: Yes Mr Rex, I am guilty .. not all people are perfect! best regards form Timeok Il 2012-12-19 23:26 Rex ha scritto: This is a sign that people can't digest all

Re: [time-nuts] Is now the timepod a symmetricom product ?

2012-12-19 Thread Rex
This is a sign that people can't digest all the messages on time-nuts. There was this... (thread replies included John) and this... On 12/19/2012 1:29 PM, Didier Juges

Re: [time-nuts] OT: Mayans

2012-12-19 Thread Rex
Ha, ha. That brightened my afternoon. On 12/19/2012 9:13 AM, J. Forster wrote: -John === [Cartoon] ___ time-nuts mailing list -- To unsubscribe, go to and

Re: [time-nuts] Nifty MINI TIC for DMTD work please hold off, 4 channel pic...

2012-12-10 Thread Rex
, or a transmittable sketch format, and what the desired output is, maybe I could help. Contact me if you think another cook could possibly help the broth. -Rex in San Jose, CA On 12/9/2012 3:20 AM, wrote: We have a choice of two dual mixers, my copy of the original NBS

Re: [time-nuts] EIP545A 18GHz counter query

2012-12-10 Thread Rex
, to this thread for closing to posterity searchers. (And me.) And, in the mean time, good luck, bon debugging. -Rex On 12/9/2012 8:41 AM, paul swed wrote: Chris TP4 is not all that helpful its a control signal. So let me back up for a minute. What are we troubleshooting? I was thinking band 2 was semi

[time-nuts] Poor termination effects?

2012-11-28 Thread Rex
I live in the San Francisco bay area. You may recall that back in 1989 we had a big earthquake that did a lot of damage. The epicenter was near Loma Prieta, which became the name for this earthquake. That is about 60 miles south of San Francisco, yet a lot of the bad damage occurred there, at

Re: [time-nuts] Z3801A Problem

2012-11-07 Thread Rex
that there was no way to update the firmware outside of the factory. That is what I remember. -Rex On 11/7/2012 5:05 AM, Azelio Boriani wrote: Never found an Oncore firmware file... can you point me to anyone of them? I'm curious to see one. On Wed, Nov 7, 2012 at 1:30 PM, Bob Campli

Re: [time-nuts] HP Z3805A com port and monitoring questions

2012-10-15 Thread Rex
On 10/14/2012 10:43 PM, Ulrich Bangert wrote: There's another telco model that has an MTI 260 oscillator, that I think was manufactured in Korea but does not have the Samsung logo on the front. I don't know much about that one. I do own a Z3805 WITH the Samsung logo on the front AND WITH a MTI

Re: [time-nuts] Z3805 etc

2012-10-15 Thread Rex
Yes, 5 MHz MTI 260 in both my Z3085 and Z3816A, doubled somewhere inside for the 10 MHz output. On 10/15/2012 12:32 AM, Azelio Boriani wrote: 5MHz? Then it is doubled to have 10MHz at the output... On Mon, Oct 15, 2012 at 8:17 AM, Murray Ulrich is right

Re: [time-nuts] Mouser connector

2012-10-14 Thread Rex
I think these are correct... 24-pin LOPRO WRMNT 3M D-Subminiature Connector is printed on the envelopes from Mouser. Plug Mouser 517-3548-100 , (3M 3458-1000) and Socket Mouser 517-3549-1000 , (3M 3549-1000) If I remember right when I ordered about a year ago, there was a problem in the

Re: [time-nuts] messy workbenches

2012-09-28 Thread Rex
Another serious contender in the messy but productive realm was Bob Pease. Quite ironic that Bob died while leaving the memorial for Jim Williams.

Re: [time-nuts] Best GPSDO

2012-09-28 Thread Rex
On 9/28/2012 8:31 PM, Chris Albertson wrote: You can guess the real question here: how good does the 10MHz reference need to be to test real-world receivers? Pretty sure the answer is good enough, but... Depends on the receiver and what it is receiving. I got interested in time-nuttyness

Re: [time-nuts] FTS 1000B oscillator for sale

2012-09-10 Thread Rex
Per the datasheet I just found... it should be 5 MHz and 10 MHz. I assume the 10 MHz is from an internal doubler. Corby, Another question. I just found that datasheet but nothing about the 1000A. What's the difference between A and B? -Rex On 9

Re: [time-nuts] REF osc distribution.

2012-09-05 Thread Rex
A couple links on what Bob is referencing: On 9/5/2012 9:46 AM, Bob Camp wrote: Hi There are a number of discrete transistor buffers that have very good isolation and short term stability / phase noise

Re: [time-nuts] Isotemp OCXO trimpot question...

2012-08-28 Thread Rex
Read more carefully, Bob. It was a joke based on a typo. On 8/28/2012 5:44 PM, Bob Camp wrote: Hi I wouldn't go to crazy digging up a 10K pot. I suspect that anything in the 10K to 50K range will work ok. Bob On Aug 28, 2012, at 8:24 PM, wrote: Now I need to

Re: [time-nuts] Understanding Oliver Collins Paper Design of Low Jitter Hard Limiters

2012-08-21 Thread Rex
On 8/21/2012 1:22 PM, David wrote: On Tue, 21 Aug 2012 10:50:43 -0600, wrote: Hello everyone, I am new to this forum. It looks like a lively discussion on various topics. A colleague of mine here at Agilent pointed me to this paper entitled The Design of Low Jitter

Re: [time-nuts] What size graphs do people like? (How big is yourscreen?)

2012-08-08 Thread Rex
. In the mean time it looks like I won't be using any SVG on my pages either. -Rex On 8/7/2012 11:57 PM, Hal Murray wrote: said: So you are saying that SVG can't work because one example of it is broken. Also, there are other vector formats, like Postscript and PDF

Re: [time-nuts] Cables dor 10 mHz

2012-07-30 Thread Rex
Many years back I bought a long coil of the orange cable with N connectors on it at a flea market. Only when I got home did I notice that vampires had been gnawing on it in many places :-( I should have known better and spotted the holes. I'm pretty sure I know which box holds my vampire tool

Re: [time-nuts] Lightsquared questionfor SFO area....

2012-07-27 Thread Rex
I've had a graph logging on my HP3816A in San Jose. I see one big glitch on 7/27 ~17:00 UTC. I don't know if it unlocked, nor if it was from something received, or some jump in my hardware. Other than that one jump, I don't see anything unusual over the last week or so. There must be others

Re: [time-nuts] Leap Second Results

2012-07-01 Thread Rex
Nice list. You clearly have the disease. (Where do you find the time? :-) ) I think the first, Z3810A, was meant to be Z3801A, correct? On 6/30/2012 7:32 PM, BD Systems Inc. wrote: In testing and loggging the Z3810A, Z3805A, Z3815A, Z3816A, 59503A, 58503B and the 59551A GPS Receivers, all

Re: [time-nuts] Different or defective FE-5680A?

2012-06-09 Thread Rex
wiki and update it if new variations or modifications are found: -Rex ___ time-nuts mailing list -- To unsubscribe, go to and follow

Re: [time-nuts] Those helix antennas in the photos...

2012-06-05 Thread Rex
On 6/5/2012 5:36 AM, George Dubovsky wrote: On (B) and (C), helices are tapered to broadband their frequency response. Usually the pitch changes along with the diameter. 73, geo - n4ua I was just reading in the 3rd edition of Antenna Engineering Handbook, that the sharp taper at the end

Re: [time-nuts] Antenna question about RHCP/LHCP I'm sure a time-nut can answer

2012-06-05 Thread Rex
I took a scan through Kraus Antennas since he did much of the definitive work on Helical antennas. In his chapter on Wave Polarization he gives a mathematical definition of Left- and Right-circular polarization, then quickly mentions that the IEEE definition is the opposite. He has a footnote:

Re: [time-nuts] GPS and Rubidium frequency standards and noise question (new...

2012-06-03 Thread Rex
the *time* to build or set up a system where I could get trustworthy measurements of these *timing* quality things myself. I keep reading but never seem to find the time to actually do it. -Rex On 6/3/2012 1:46 AM, wrote: Jerry, Chris, it's all relative, while the Lpro may

Re: [time-nuts] USGS: GPS for seismic work

2012-05-19 Thread Rex
I was at the USGS open house for a couple hours. My first time to go. Was also my first time to see a commercial choke ring GPS antenna up close. Was interesting to see the antenna shifted a few inches and causing a step function on the internet screen where they where monitoring it along

Re: [time-nuts] USGS: GPS for seismic work

2012-05-19 Thread Rex
On 5/19/2012 10:22 PM, Hal Murray wrote: Another gadget that I saw was a two color laser ranging setup. It was good for 1 mm over 5 km. (ballpark) I think I saw that too. Pretty old; mid-80's probably. The number switches caught my attention. Made me try to figure out the vintage. My guess

Re: [time-nuts] Buffering a PPS signal

2012-05-17 Thread Rex
In line with what Bob suggests, here is one of the square wave outputs of an HP Z3816A... Or look at the project for context... On 5/17/2012 6:17 PM, Bob Camp wrote: Hi Parallel up

Re: [time-nuts] Holy cesium clock, Batman!

2012-04-07 Thread Rex
On 4/7/2012 5:59 PM, Mark Sims wrote: One of the nose-bleed channels (MeTV) just showed an old 1980's Batman show... For a time nut, you are off by at least 14 years. (1980 - 1966 = 14) The Clock King's Crazy Crimes October 12, 1966 The Clock King Gets Crowned October 13, 1966 The ABC

Re: [time-nuts] Book by William Riley

2012-03-26 Thread Rex
On 3/24/2012 3:54 PM, Magnus Danielson wrote: and the Hanbook of Frequency Stability Analysis You didn't mention looking at that one. Any comments about it? ___ time-nuts mailing list -- To unsubscribe, go to

Re: [time-nuts] FCC Chair Talks Spectrum, Gets GPS Letter

2012-03-07 Thread Rex
There's also a few cars, trucks, emergency vehicles, hand-helds and timing receivers that he didn't bother to mention at all. I suspect most of those would be fixed by complete replacement. (If a full fix is even possible in all situations.) On 3/6/2012 7:37 PM, wrote: I'm

Re: [time-nuts] nanoseconds in the news

2012-02-17 Thread Rex
John, I agree with what you have said about the markets causing bad effects on society because the focus is all short-term, but you are talking about effects on the human time scale. HFT is orders of magnitude faster and more insane. I saved two links from after the time of the 2010 flash

Re: [time-nuts] FE-5680A Question

2012-02-14 Thread Rex
The Efrotoms (FRS-C. Lpro) find the lock by modulating the microwave frequency with an audio signal (127 Hz if I remember right) which causes the light sense modulated signal to double in frequency when centered on the hyperfine frequency. See the manuals for nice description. The 5680A seems

Re: [time-nuts] PTS synthesizers

2012-02-09 Thread Rex
but additionally was not an exact copy from PTS documents. C'est la vie. Ob-La-Di, Ob-La-Da. -Rex, KK6MK ___ time-nuts mailing list -- To unsubscribe, go to and follow

Re: [time-nuts] PTS synthesizers

2012-02-09 Thread Rex
The pin-outs are the same on the BCD input connector, but how the high-order controls map differs between models. For example, the PTS-160 doesn't use the 4-bits for 100 MHz, but rather takes input on the 10 MHz bits up to a value of 16. The PTS-250 does use the 100 MHz bits, with values of

Re: [time-nuts] PTS synthesizers

2012-02-09 Thread Rex
that helps the OP's quests. -Rex On 2/9/2012 5:45 PM, Joseph Gray wrote: I don't have any PTS gear, but the Internet Archive has this old page: And a quick Google turned up these links: http

Re: [time-nuts] PTS synthesizers

2012-02-08 Thread Rex
share HP's (now Agilent) openness about sharing documents. -Rex, KK6MK On 2/8/2012 2:57 PM, wrote: I still haven't had time yet to try your remote interface, which I suspect others here might also find very interesting, but I have completed the scans of my X10 and PTS250

Re: [time-nuts] FE-5680A 1 pps photo

2012-02-04 Thread Rex
Good image. So, if I read that right it is a pulse about 1 uS wide and goes from base of zero volts to about 5.8 V. Curious why the high level is over 5 V? Is your 5 V supply to the Rubidium unit up there? On 2/3/2012 8:52 PM, Bob Bownes wrote: Just for completeness sake, here is a

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