[time-nuts] TN equipment FS
Learned Members, With 2 years planning coupled with stealth and deviousness we escaped CA after selling our condo to Zillow. We are now residing in the state of South Carolina where it's green for hundreds and hundreds of miles in any direction and no smog. We are in the small town of Clinton, and we're extremely happy. Due to family health/age issues, I'm selling off all my TN equipment as a package deal.I'm looking at around $2K plus shipping. HP Cs with spare tube/controller , Tracor 527E, TAPR TICC, 2 TAPR TADD-2. The TAPR stuff has not been used. The Tracor 527E is in IIRC good condition (it was packed several years ago) as was the TAPR stuff Before moving, I double boxed the HP Cs with foam/bubble wrap in each box. Shipping weight is at least 50 lbs +. Please contact me by off line email only if interested. I will ship internationally if all costs are paid up front. YOYO for customs costs. Regards, Perry KM6FQV ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] HP 105 late model
Esteemed List, I created a service manual for the 2128AX model only. It's posted on the KO4BB site or you can email me off line and I'll send a copy. I also have BIT TIFF images that can be expanded W/O smearing. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 5 Digit Panel meters
Learned List, From the on and off list comments I've received I realize that I didn't provide a fuller explanation of my proposed idea for this I apologize. What I was proposing was to try and use the tiny panel meters fount on ebay when you use the category listed as *Digital Panel Meters*. One listing number is 203076543505. Measurement range: DC: 0.000-33.000V. for $3.83 plus free shipping. This is just one of many listings for similar items. As I stated in my original post, I have no idea if they are accurate, stable or suitable to what I proposed. Some of the replies mentioned temperature drift and other potential problems which may make then unsuitable for my idea. This was to measure three different voltages simultaneously and see if there was some useful correlation in the readings. This is an experimental concept idea which may or may not be useful..Sometimes these ideas work or we learn to go to plan *B, C, or D* Because of the low cost i felt that this might a useful idea. Others with more experience of these voltages and how much they do or do not change may judge my idea as impracticable. That's fine. I learn from the list comments and I'd rather hear that it's not a good idea from the members before spending the money and effort. I do have a Fluke/Phillips 6.5 for making precise reading when needed. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] OCXO retrace, how long is reasonable?
Learned members, Wrote: Well, I could measure the EFC voltage every other day and if it'schanging, then it's the OCXO that’s drifting, if not (or not inaccordance to the DAC graph) it's the DAC itself. One can buy 5 digit LED meters on ebay for $5 each +shipping. While I wouldn't necessarily trust their accuracy, at that price one could buy 3 or 4 and continuously measure several variables. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] calibration of oscillators with WWV
Learned List, During the discussion of using WWVB for oscillator calibration it was mentioned that the best accuracy the could be obtained was 1 x 10^12th. My question is what would be the best accuracy one could reasonably expect using any methods of comparison? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] low power divide by 5
Learned List When I was looking for a 100 MHz divide by 10 in a dip package I was advised by someone on the list to use the 74LS161. It's available on Ebay on ebay from several sources for reasonable prices. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FA 2 Counter variations
Learned List, Checking the Ebay listings for the FA-2 counter I saw three variations. One had just BG7TBL on the bottom of the face plate. A second -since deleted- had BG7TBL XX- XX- (date). A third one was labeled BG7TBL 20190622. All had wildly different prices. So is this just some form of date coding or is there some technical difference? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Alltest used test equipment and parts
Learned Members, Sorry for the confusion. It is ALLTEST Instruments, Inc locate in Farmingdale, New Jersey. Regards, Perrier On Tuesday, May 26, 2020, 5:11:13 PM PDT, Richard (Rick) Karlquist wrote: On 5/26/2020 4:42 PM, Perry Sandeen via time-nuts wrote: > Learned Members, > While window shopping on Ebay sites of stuff -I'd- like- to- have -but- for > -now-dream-on I noticed that Alltest was selling over 8,000 items on Ebay. > I googled "Alltest" and came up with a bunch of similar variant names containing "Alltest". Could you please be specific as to which vendor you are talking about. Rick N6RK ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Alltest used test equipment and parts
Learned Members, While window shopping on Ebay sites of stuff -I'd- like- to- have -but- for -now-dream-on I noticed that Alltest was selling over 8,000 items on Ebay. Out of curiosity I searched the site from low + high + shipping and discovered that they had over 600 items for less that $50. There is a large selection of mini-circut combiners, spliters, RF relays, DC controlled attenuaters and other misc. items. Some are DC to 2Ghz, others are for specific bands including the GPS frequency. Most have SMA connectors though. A builders delight. Also they have a number of (mostly) HP spec analyzers starting are $500 or so. While their prices seem a bit high, most have make an offer. One advantage they have over other sellers is that their stuff works or is listed for parts only. FWIW, Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Power Supplies
Learned Gentlemen, I personally dislike equipment that uses *wall warts* due to quality concerns One inexpensive way I've powered my Lucent equipment is using used laptop power supplies. They're easily found at HamFests or on ebay. On Ebay prices very wildly. If you buy 3 or 4 they can be $5 each shipped. Another source to consider are the Mean Well SRPS at Jameco. They run from 55 watts on up with a wide range of voltages. They are have spec sheets. Some SRPS's on ebay are cheap but their quality... Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] time-nuts Digest, Vol 190, Issue 3
GPSDO Questions Learned Gentlemen, First off, any GPSDO is better than none. Now it's been stated on postings that some chicom GPSDO's are frequency locked (apparently not a good idea) and those that are phase locked. So how does one know what you are getting? I suspect asking the vendor would be pointless. Bert posted a while back that his Tbolt occasionally had a hiccup that he was able to find when comparing it to a HP Rb and HP Cs. So what can do other than live with these situations, which maybe in the long run, might for most of us, a minor unsolvable nuisance? Also BTW are the Lucent GPSDO's a phase locked GPSDO since I have 2? Regards, Perrier On Saturday, May 2, 2020, 9:00:11 AM PDT, time-nuts-requ...@lists.febo.com wrote: Send time-nuts mailing list submissions to time-nuts@lists.febo.com To subscribe or unsubscribe via the World Wide Web, visit http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com or, via email, send a message with subject or body 'help' to time-nuts-requ...@lists.febo.com You can reach the person managing the list at time-nuts-ow...@lists.febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics: 1. Re: GPSDO advice (Bob kb8tq) 2. Re: GPSDO advice (Wes) 3. Re: GPSDO advice (Richard Solomon) 4. Re: GPSDO advice (Bill Notfaded) 5. Re: power supplies (Poul-Henning Kamp) 6. Re: power supplies (ed breya) 7. Re: FE-5680A - Newbie capacitor question (Matthias Welwarsky) 8. Re: FE-5680A - Newbie capacitor question (Didier Juges) 9. Re: GPSDO advice (Bob kb8tq) 10. Pre-averaging Phase Data (Simon Lewis) 11. Re: GPSDO advice (Wes) 12. Re: Pre-averaging Phase Data (Bob kb8tq) 13. Re: Pre-averaging Phase Data (Poul-Henning Kamp) -- Message: 1 Date: Fri, 1 May 2020 22:29:29 -0400 From: Bob kb8tq To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPSDO advice Message-ID: Content-Type: text/plain; charset=utf-8 Hi I would guess that the vast majority of folks on the list and an even larger percentage doing the FMT are buying their GPSDO?s on eBay. Which ones they buy and how well the work is very much a ?that depends sort of thing?. The crop of devices at low(er) prices changes every 3 to 5 years. Whatever is being torn apart right now will be contributing the low cost stuff. If you bought 5 years ago your choices were very different. Go back 5 or 10 years past that and the devices change again and then again. There?s no reason to believe that ?things were better in the old days?. Mostly just different. The issues have been worked out on stuff that hit eBay 20 years ago. That?s just the way it works. How well they have been worked out ?. that depends on the device and how picky you are. This does not simply apply to GPSDO?s. A while back eBay was awash in telecom Rb?s. Some bought so many they can?t keep track of all of them. Today a $35 listing for an Rb is pretty unusual. That?s just supply and demand. Wait another 5 or 10 years and we probably will be awash in cheap ones again. Right now ?entry level? GPSDO?s are still below $100 delivered. That?s not all that crazy compared to a lot of gear in a typical shack or on a typical bench. Bob > On May 1, 2020, at 9:25 PM, Wes wrote: > > An update on this: > > I emailed both Jackson and Brandywine for prices on both the Desktop Fury, in > Jackson's case, and the board versions from each of them. > > The good news is that they both were responsive. The bad news is they are > both out of my price range. Jackson by about 3 dB. Brandywine clearly didn't > want to sell me anything, as exemplified by a fee of $47 to use a credit card. > > As much as I would like to be more nutty, I can't justify spending this kind > of money just to participate in ARRL FMTs where the only direction I have to > go is down. > > Wes N7WS > > On 4/24/2020 11:56 AM, Wes wrote: >> Taking some of the advice offered, I've emailed them for P&A. I'll let you >> know if I hear back. >> >> Wes >> >> On 4/24/2020 10:45 AM, Kevin Rowett wrote: On Apr 24, 2020, at 10:32 AM, Mark Spencer wrote: Speaking both as an amateur radio operator and some one who modestly pursues precision time and frequency as a hobby, I am extremely happy with my Jackson Labs Fury GPSDO. >>> >>> Speaking of Jackson Labs, has anyone heard from them, since the lockdown >>> commenced? >>> >>> KR >> > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. -- Message: 2 Date: Fri, 1 May 2020 20:25:10 -0700 From: Wes To: time-nuts@lists.febo.com Subject: Re:
[time-nuts] Vaperware Parts and pulse stretching circuits
Learned Gentlemen, Several poster wrote: TAPR offers a FatPPS kit to stretch the pulse out, and it looks likethey're back in stock. I have one but haven't assembled it yet.https://tapr.org/product/fatpps-pulse-stretcher/ OK no problemo. But it's $55. It's probably a great device, but does this application warrant such expense? I looked up *pulse stretcher circuits* and found over a dozen inexpensive circuits. DRV8662and is available from Digikey for $3.35. It is a small-pitch device(0.5mm) but not impossible to solder. RV-3028 is 3.2x1.5 mm in size, 1.5ppm, additionally trimmable, 45 nAstandby current, under $3 USD in price and in stock at Mouser andDigikey. Aswonderful as the DS3231 is, there is a newer chip from Micro Crystalthat is smaller, more accurate than the DS3231M, much cheaper, anddraws less power These three chips fall into the *Vaperware Parts* category. Yes, they are great chips and I don't mind someone posting their advantages. I believe It is a bit disingenuous to say: *It is a small-pitch device but not impossible to solder*. Really? If you've dropped $750 to $1K for a stereo microscope and other specialized soldering equipment then you can probably do it without too much difficulty. Or some may access to such specialized equipment. But for us *Po Folks* hobbyist we have to stick with older but larger parts. Now if there was a service where you could order the part soldered to a breakout board with .1 inch breakout pins for say, $20 then using many of the latest chips would be feasible. But until then I believe 99.9 percent of us have to find a commercial product or some other workaround. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] '101 uses for a dead cesium'
learned Gentlemen, wrote: we should create a compendium: '101 uses for a dead cesium' The ultimate Time Nuts funeral urn. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Phase noise confusion II
Learned Gentlemen, The explanation by Tobias was excellent and fully answered my question. I think I'll be able to use my Fluke 6080AN for offset generation so the problem will be the measurement after the mixer. What is now called phase noise was taught to me as *jitter* over 55 years ago. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] "Barnabus" HP 10811
Learned Gentlemen, Rick wrote:If you really need lower far out phase noise than the 10811 offers,you can redesign the 2nd and 3rd bufferamplifier stages. The 10811 designers knowingly degraded the phasenoise in those stages because of requirements to be backwardcompatible with 10544 sockets. They made a one-off demonstrationoscillator coded named "Barnabus" with ultra low noise. Italways seemed to be the proverbial "solution in search of aproblem." Well.this being Time Nuts.. Is there a circuit that can use different parts and the same PC wiring in the 10811 to make a conversion? I have no ability to design anything like that but, OTOH plagiarism would be a viable option,especially since 10811's on Ebay are less than $80 almost all the time so Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] GPS control of telecom Rb's
Learned Gentlemen, wrote: Backing up a little bit. the PPS in on these telecom Rb’s isdesigned to easily get the part set on frequency. It’s not designedfor a GPSDO application. While this is true, I've copied three LPRO-101 circuits from the net and digitized some of the original pencil drawn circuits. They have been on the web for seven years. I've sent these to the KO4BB website for posting. If you can't find them there please contact me off list and I'll email them to you. They are: Modifying Lucent RFG-M-RB Rubidium Frequency Standard - Getting themost out of the industrial rubidium unit A LPRO-101 Rubidium standard with PLL TCXO output stage Using GPS to Fine-Tune a Rubidium Frequency Standard Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Phase noise principle and measuring confusion
Learned Gentleman, I've read several articles on phase noise but I'm lost. I need a *Ding-Dong* school explanation of what it is, why it's important and how one goes about measuring it. Bob wrote: Phase measurement of my GPSDO Thequick way to do this is with a single mixer. Take something like anold 10811 and use the coarse tune to set it high in frequency by 5 to10 Hz. Thenfeed it into an RPD-1 mixer and pull out the 5 to 10 Hz audio tone.That tone is the *difference* between the 10811 and your device undertest. Ifthe DUT moves 1 Hz, the audio tone changes by 1 Hz. Ifyou measured the 10 MHz on the DUT, that 1 Hz would be a very smallshift ( 0.1 ppm ). At 10 Hz it’s a 10% change. You have ‘amplified’ the change in frequency by the ratio of 10 MHz to 10 Hz ( so amillion X increase ). *IF*you could tack that on to the ADEV plot of your 5335 ( no, it’s notthat simple) your 7x10^-10 at 1 second would become more 7x10^-16 at1 second. OK, this seems to me that this is measuring frequency difference. wrote: Thereason its not quite that simple is that the input circuit on thecounter really does not handle a 10 Hz audio tone as well as ithandles a 10 MHz RF signal. Instead of getting 9 digits a second, youprobably will get three *good* digits a second and another 6 digitsof noise. OK, then would using a 3336A synthesizer work by using the *good* 10811 or other 10 MHz as an external reference and provide, say, a 10 MHz + 100 Hz or 10 MHz + 1KHz work with the 5335? (I have two). Or am I missing something (or a lot)? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] DIY HP 105B Service Manual
Esteemed Members, Several years ago I had a late model HP 105B that was configured with the HP 10811 OCXO and was only listed in an errata document so I made my own. I've sent it to the KO4BB website for posting. I had misplaced my files and had thought I'd lost them in a hard drive crash. If anyone needs a copy before it's posted, contact me off list and I'll email it to you. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Key to HP 106 Performance?
Learned Gentlemen, After TVB posted his HP 106 experience I became curios why it was so good after having a HP 107. Both schematics look extremely similar but on closer examination the 106 uses a 2.5 MHz oscillator crystal which is doubled and then fed through a 5 MHz crystal. The 107 uses a 5 MHz crystal but it is also fed through a 5 MHz crystal. Both are physically mammoth compared to the previous 100 series which allows for more circuitry which makes both far easier to service. Lifting however is another issue... Another similarity for both are the number of *factory select* with nominal values shown. It would be quite interesting to know how they did the process of *final tuning*. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Crystal filters in test equipment
Learned Gentlemen, Both the HP 106 and 107 have a post oscillator crystal filter. There is also a 10 MHz crystal filter used in my Tracor 527E FDM. So the question I have is there anything to be gained by adding 10 MHz crystal filters to the 10811 and similar OCXO's? They are very inexpensive to purchase. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP 106B on Ebay
Gents, This is the only one I've ever seen on ebay in 15+ years. Sold as parts only but it has a clean 5Mhz output. No bids so far at $499. Auction ends Sat 1:52 PDST. (I'd buy it if my discretionary financial situation was better). Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP 5335A counter and GPIB control
Learned Gentlemen, I D/L'd the John Miles' toolkit. It's just what I was looking for! Another question. There are numerous GPIB-USB adapters available on ebay most go for $75 and up. Yet ther is this company UGPlus USB to GPIB controller Made in USA that sells their units for $46 shipped. Does anyone know how well they work or if they need more software or *fiddling around* than the more expensive units? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP 5335A and using the HPIB for control
Learned gentlemen, Thanks for all the replies! Some additional info. I'm 79 yo and never had any programming classes or experience in programming. My specialty was the field of maintaining medical equipment. My tech education in the USAF was ground radio (with tubes no less). I wasn't aware that HPIB controllers could be ad in the $35 range. I was also unaware of the HP program ifo that was posted in a reply. One proposed use of the 5335 is to place it on the 1 MHz + delta error output of my Tracor 527 FDM looking for a LSD *long count* and also being able to just measure a stand alone oscillators frequency for an extended time. I'm a total newbe as far as the HPIB is concerned. I read the info in te 5335 manual and was totally lost. So I'm trying to consider if the data information I seek is worth the time, effort and my budgetary limits to do this. I do have a set of the TAPR modules to try out I do have a Cs for my basic reference as well as several HP 3336's for making offset frequencies. I'm searching ifo know so after we move I can hit the bricks running. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP 5335A and using the HPIB for control
Learned Gentlemen, While my TN stuff is packed for moving, I took a look at the HP 5335 spec sheet. It appears that the gate time can be extended up to 10^7 seconds which would be very useful. Talking with Bob Camp off list he said that any HPIB controls would involve some programming which is impossible to do. There is a labview home program for about $100 but that would also require some programing. I could make extended gate times by making a 1PPS from my 10MHz reference and using it for the external gate start and counting it to get my desired stop time or perhaps there is the possibility of doing an internal mod to the counter which if it wouldn't be fairly simple, I'd rather not try. Does anyone know of or have a program that I could put on a laptop (windoz) to control the gate time function? For several reasons at this time buying something newer like a HP53131 or equivalent to accomplish this is not feasible. Thoughts? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] LPF filter parts
Learned Gentlemen, FWIW Although closed until April 2020, due to an injury, Dan's small parts has always had a great selection of chokes and capacitors for very good prices. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] GPS outages
Learned gentlemen, For anyone interested, there an extensive article on GPS problems in the February 2020 issue of Fortune magazine. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Single PS possibility
Learned gentlemen, While the idea of a single supply for all devices is attractive, one faces the risk of having everything going down with a single failure. Perhaps using multiple boost-buck SRPS's from a large battery supply might mitigate that risk. The vendor *Bang Good* seems to have a good reputation and the spec's listed seem to be very good. The output voltages are variable so it could allow a final LDR to be on each device. The prices seem reasonable but constant current output listed may require an additional cooling fan. Just FFT. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Fake new LPRO 101 Rb's on Ebay?
Yo Bubba Dudes!, There are two vendors on Ebay selling *new* LPRO 101 Rb's for around $160 each, with discounts for larger purchases. The general price of a used LPRO seems to be in the $250 to $350 range. Anybody have any ideas? (Discount for coronavirus?) In all seriousness, can the coronavirus be transmitted in gear we buy from China or does it require a living host for spreading? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Digital Pots
Learned Gentlemen, Thanks for the two references for affordable 10 turn precision pots. This will allow me to go back to my original and simpler circuit of a series string of resistors and in that string connecting the 10K10 turn pot in parallel with one of the resistors, probably a 1K, which will be set by the upper slightly above and the lower just below the *sweet spot* needed. It will take a bit of juggling for each oscillator but that will be far simpler than using 3 digital pots. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] digital pots Part 2
Learned Gentlemen, I appreciate all the reply's to my questions. Perhaps I should have added a bit more detail of my planned project after moving. I have 5 Lucent XO's and two Lucent Rb's which I want to add panel mounted fine EFC controls. I did consider Bourn's Helipots, but found used on ebay were $20 to $30 each and none had more than two for sale. I did look at the ebay Bourn,s *tribute* pots with dials from China which seemed to have the exact same item from $10 to $2 (with free shipping). I remembered that Charles Steinmetz had posted to the list that he found many of a lot he purchased were defective. So I went alookin (southern USA term for searching) for a viable alternative, hence the Maxim DS 1804 non-volatile 10K pot with 100 taps that has a simple toggle up or down interface. (I have no ability to do serial or computer control. I found a Microchip AN 691 which showed how to use two or three digital pot in series/parallel configurations. Three DS 1804's and a good reference IC for less than $10. A simple TL431 or LM723 heater circuit would be $2. So with 100 taps on each IC, I figured (with lots and lots of toggling). I could achieve sub-millivolt or better tuning steps. And I was fairly certain that fine EFC tuning was like grandma getting ready for church on Sunday. She was ready when she was ready. No amount of fussing or cajoling could change that. It occurred on her time (slow) table. Comments appreciated. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Digital Pots, wiper noise and fine tweaking oscillators
Yo Bubba Dudes!, Previous posts mentioned wiper noise and stability of a mechanical pots after tweaking. My questions are: Do digital pots after setting have wiper noise? When making fine tuning tweaks to the EFC of an OCXO, can one move it to its *dead on* setting right away or is there some lag that must be considered requiring to do it in steps? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Catalogs Spoken For
Thanks for the response. I wish I had more. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Catalogs For Postage
Yo Bubba Dudes!, I have three old catalogs available for postage from 92220. 1.. Tektronix 1980 2. Fluke 1978-1979 Instrument Catalog 3. Leads & Northrup Electrical Instruments for; Measuring - Testing- Calibration 1968. If interested please contact me off line at sandee...@yahoo.com Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 100 MHz decade divider advice needed
Yo Bubba Dudes!, I'm considering attempting making a 10 MHz frequency difference meter sort of based on the Ticor 527. The design calls for using 100 MHz OCXO's and using the PLL difference to steer the EFC and then mix it with a PLL 90 MHz locked to the reference 10 MHz. Then that 10MHz difference is fed into the next stage PLL and the process repeated in the following stages. Hy problem is this. The only generally available 100MHz decade divider I've found is the 74LS196N. The problem arises that on the TI website it's advertised as going to 100 MHz BUT when one reads the data sheet it says that it only works to 85 MHz or so. I found on ebay the MC12080 100 MHz to 1.1GHz chip that can be configured to divide by 10. Now the ON units carried by the big name distributers are about $6. The Chicom no-brand-name units on ebay are less that $2 each. I'd really like to use the LS296 chip as it is a dip type and *genuine* ones sell for less than $2 on ebay. Since I need one OCXO for each decade stage plus one for the 90 MHz reference, at $50 each used on ebay this starts to get very expensive quickly. I did find some obscure 100 MHz decade counters on some design circuit on the net but I'd never heard of them and expect they will be unobtainum. The same seems to be true for the 74S and 74AC series. So will the LS196 chip work reliably at 100 MHz or am I stuck with the MC 12080 or is there a better chip that I could use? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] John Fluke test equipment tutorial
Yo Bubba Dudes!, I've re-published the John Fluketutorial *Calibration Philosophy and Practice* Circa 1980. It describes how all the basicelectrical standards are derived and measured. It is a 14 MbytePDF. If anyone is interested in a copy please send me an *original* emailoff list for a copy Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FA-2 Data Logger details
Yo Bubba Dudes! Thanks to E W Kehren, he sent me the data logger details from Jureg. They are attached below. If it gets screwed up by yahoo mail, I'll make a PDF. SDData Logger for FA-2 https://www.sparkfun.com/products/13712 SDLogger - Open Hardware Data Logger - Seeed Wiki Ebay: Search OpenLog Connection: Gnd free plug behind the LCD → OpenLog Blk +5V free plug behind the LCD →Switch → OpenLog VCC Data FA-2 U13 R59 → OpenLog RX (thin wirewrap wire through unusedhole from bottom of boardupwards) Montage: Rectangularcut-out at the FA-2 back side 4mm x16mm, 3.2 mm hole over cut-out (the exact position depends on the hexagon bolt) 6mm hole for the switch Thereare no mounting holes on the OpenLog board. I glued a hexagonal bolt (M3 10mmlong) with Araldit (2 componentadhesive) onto the processor. MicroSD Card Config.txt Write 9600,26,3,0 into a txt file with an editor. Savethis as Config.txt on the SD card. Inthis log mode a new log file is created on every startup (LOGX.txt). Forother operating modes see the descriptions at Sparkfun or Seeedstudio. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] DUT Error Multiplication (was FA-2 Questions)
Yo Bubba Dudes!, I proposed using a HP8586A and a Fluke 6080 for DUT error multiplication of 100. Several responses basically said: the HP8656 sucked so bad it wouldn't work. Ed suggested brick PLL but i couldn't find any I could understand. So a new idea since another signal generator is not in the budget. What about the possibility of using the ADF 4351 35 Meg to 4.4Ghz PLL's along with the AD8342 active DBL mixer to get my times 100? This setup would total about $100 and be very small. I'm not concerned about phase noise. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FA-2 questions
Yo Bubba Dudes!, First, does the internal OCXO run when the power is turned off? Wrote: We are presently experimenting using a ISC570B multiplier at 100 MHz and get 13 digits seeattached but the data out of the back is only 12 digits reliable. Looking it up I found out that the ISC570B is a teeny - tiny IC which for me would pose a problem to implement. So looking at alternatives that I already had I came up with two possible alternative multiplier ideas. The first was to put the 10 MHz DUT into the external reference of my (boat anchor) HP signal generator set the output frequency to 200 MHz and put the output into the channel 1 input to get extra resolution digits. Expanding upon that, I came with more complex but what may be a better error multiplier reading since I have both signal generators on hand. First I feed the 10 MHz DUT signal into my Fluke 6080 setting the output to 1 GHz. I'd then feed the reference 10 MHz signal into the external reference of my HP 8656 and set the output to 990 MHz. Next I'd feed both outputs into a AD8342 LF to 3.8GHZ Active Mixer Down conversion Output withBalun Transformer board from ebay ($23) and then feed the multiplied signal into channel 1. (I may need a simple low pass filter.) This should give me a 100X error multiplication. Am I on the right track or am I missing something? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Question for my new GPSDO Heater
Yo Bubba Dudes!, The suggestion was made to use a ebay item number 192112054053 heater for this project. Now it's cheap and has a digital reading. BUT It is a bang- bang controller using a relay. At some point that relay will stop working. Also all designs I've seen for good temperature control use proportional solid state controllers. There are plenty of free designs on the internet. Lastly, if one believes that this is long term reliable controller that will deliver .1 degree accuracy, for that price, please contact me off line and I will set you up with some really cheap (but slightly scorched and a burned wood smell) lots to where you can build your dream home here in California. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FA-2 Operator manual
Yo Bubba Dudes!, For those who may be interested, I D/L djl's FA-2 manual and revised both pictures and text. Don said he would post it for me on the KO4BB site as I haven't had good luck uploading stuff. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 15 to 10 MHz
Yo Bubba Dudes!, I sent David a divide by 1.5 circuit diagram. If it would be of interest to any please send me an email off list and I'd be glad to email to you. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] GPS Disciplined Oscillator FS
Yo Bubba Dudes!, Several years ago I bought a GPSDO from Hong Kong. It didn't lock even afer running for 24+ hours. The seller agreed to replace it BUT shipping was quoted at $175. So I was stumped. Now later the USPO will send it for $35 but the seller may be long gone and shipping anything to HK right now seems a bit dicey. It appears very similar to all those on ebay except the front panel is green and has the LCD display on the front and the GPS antenna input on the back. In very tiny print on the front panel is the number 20127A-Y44 but no other identification. I've never opened as I too busy with other *stuff*. Lose connection or other: I don't know. I paid $219 for the receiver, PS, and antenna. I would be willing to sell it for $50 and postage from 92220. If interested, please send me an email off list. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FA-2 Precision Frequency Counter BG7TBL 20190622
Yo Bubba Dudes!, While looking on ebay at the BG7TBL FA1 analyzer I looked on the bottom of the page where other items are advertised an saw ads for the FA-2 Precision Frequency counter which is sold by multiple vendors in the $115 range. As I have to down-size It appears to be just what I could use albeit it requires a wall-wart PS.:( It seems to have a very good price/performance ratio. Does anyone have one or experience with one and could share their experience? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Subject: Re: Keysight N5511A - phase noise measurements down to theoretical-177 dBm/Hz
Gentlemen, A question for my curiosity and education. Traditionally, the standard was 10X better than what was being calibrated. Since this is at the theoretical limit, how might it be calibrated so the numbers provided are accurate? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] R390A Mis-post
Gentlemen, Apologies for my mis-post. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Stabilizing the R390A BFO
Yo Bubba Dudes!, Wrote: I'm now working on the BFO stability. Larry, In the Y2KR3 chapter 3 pt 1, Dallas Lankford describes a circuit he used for BFO stabilization. Now if you want to be really, really, exotic - one could put a thermistor in the PTO oven and use a simple SS temerature regulator circuit. Contact me off list if you want a ski. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] TAPR TIC Upgrade?
Yo Bubba Dudes!, I've just purchased a TAPR TIC module. Now the new Raspberry Pi Model B has just been released. So my question is would there be any worthwhile advantage to replacing the TAPR unit with the new Model 4B? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] TCXO improvement
Yo Bubba Dudes!, If one has the space, a simple cure might be to get one of the wide mouth thermos containers that they sell in large variety stores such as Wal-Mart for being able to eat something like stew or some semi-solid hot food out of the container itself. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FSA3011 Frequency Stability Analyzer, HP 8405A or TAPR TIC
Yo Bubba Dudes!, I've been following the discussion of the FSA3011 with great interest. Now I'm not in the upper levels of TN esoteric knowledge or have a burning desire to ever get there. After seeing some small reference somewhere I looked at the HP 8405A on ebay and the price range seemed comparable to the FSA3011. Now the HP 8405 is a huge beast but i was thinking that it might be easier for me to use. I'm interested in just 5 and 10 MHz oscillator comparison. I know nothing about computer programs or writing any code. I also looked at the TAPR TIC. So my conclusion are: The FSA3011 may be technically the best BUT it seems to be having some teething problems and I don't really know about what programs it runs or needs. The HP 8405A is a big beast, but it maybe simpler for me to run and get the results I want which is stopping around 10 to ^12th. But I may have to watch it for a long time. The TAPR TIC is small (needed) cheaper (also a plus) and seems to run available software. but needs a dedicated laptop, which is not a real problem. I also have several extra HP 18011's available. Your opinions are gratefully solicited, Regards, Perrier Perrier If I can just download programs AFAIK I could use the TAPR TIC as I have a spare laptop that I could dedicate for its use. The two advantaages ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Both 5370B's Sold
Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP 5370 A's & B's FS
Yo Bubba Dudes!, Since we're moving 2,200 miles I need to lighten the load a bit. 5370B works, fair condition $300 5370B Has +15V PS fault. Comes with 5370 extension board kit. $300. Both have HP 10811 osc. that works. 5370A Goes through start up but stops. Missing one input/ pot +knob also has HP 10811 osc that works $100. 5370A Some PS fault(s) earlier HP osc that works. $100. All are complete units.All are plus shipping from 92220 (45 lbs. packed). Buy all for $700. Please send an original email off-line if interested. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP 10811 stabilizing time
Yo Bubba Dudes!, I bought a HP 10811 from ebay for $36 and shipping. I installed it in my HP 5335a counter. After running continuously for about 90 days it was down to about 4 to 6 parts in -10. I couldn't adjust it for better accuracy as HP in their infinite and inscrutable wisdom provided a edge connector for the 10811 but didn't make provision for EFC one had only the course adjustment. Sheesh! Now maybe I was very lucky in my ebay purchase. On ebay prices seem to go from $125 to around $60. One of the lower priced sellers advertise that their 10811's are *tested* but no details. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] High accuracy temp controller ckt
Yo Bubba Dudes!, This may not be too germain to the present discussion of temperature controllers but if anyone is interested I have a PDF copy of: A versatile thermoelectric temperature controller with10 mK reproducibility and 100 mK absolute accuracy by K. G. Libbrechta and A. W. LibbrechtDepartment of Physics, California Institute ofTechnology, Pasadena, California 91125, USA Received 4 September 2009; accepted 23 November 2009; published online28 December 2009 If interested send me an email and I'll attach a copy Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] GPS frequency uncertainty
Yo Bubba Dudes! In a number of fascinating and highly educational for me were the explanation of accuracy by TVB and others. I learned quite a lot, thank you. Bob mentioned about slight orbital variations in the GPS satellites. IIRC those slight variations meant that you could only reliably get about 1x10^12.accuracy. Would someone please expand on what the practical frequency calibration limit might be? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Used Hydrogen Maser
Yo Bubba Dudes!, OK, I'll finally ask the question that probably a lot of list members wanted to know but were reticent to ask. First, what is the price of one of a new Hydrogen Maser? (This is important if I win the lottery.) Second, what would be prices for used Hydrogen Maser in *reasonable* working condition and what might be the long term costs to keep it running? Thirdly, what are the chances of finding a used one? Then again, might it be better, money wise just to limp along with used HP Cs? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Using the LT3042
Yo Bubba Dudes!, The LT3042 seems to be a wonderful part. But having learned a long time ago the it wasn't wise to gold plate a Yugo, so when are there diminishing returns? For example I have several HP 10811 oscillators. one is in a HP5335a counter that I'd like to make as stable as reasonably possible. Another HP10811 needs a power supply. Also several Lucent XO OCXO's. So where is it practical to hack for better results and when do you use some not -as -wonderful regulator chips that come in a much easier to use dip package for a power supply upgrade? Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Excellent equipment rack
Yo Bubba Dudes!, Needing to go vertical with my test equipment I went bottom feeding for an equipment cabinet on ebay. To make a long search story short: they were way too expensive, too heavy to ship and too far away for pickup. So I kept searching and finally came across what was listed as *42U Four Post Open Frame Server Data Rack 19 inches. Adjustable depth 23 to 32 inches.ebay number 152319524877.Sold by Raising Electronics for US $188 and free shipping. I was unsure what a *U* height meant put it seemed tall enough so I bought one. I was a little apprehensive about this being a Chinese metal product. I was very pleasantly proven very wrong. Although it only comes with a picture of an assembled unit it has been engine ed so there is no way you can assemble improperly. The four posts are all equal and can be installed with any end up or down and the top and bottom brackets will fit. It comes with the exact 50 M6-20 head bolts and nuts needed for assembly. The nearest SAE equivalent bolt size is 1/4 20 x 1/2L which I purchased to hold L shelf brackets to the frame. I set the depth of mine to 26 inches so my 5370's fit well and I had space for both power and BNC cables to be inside the frame. This rack is designed to be bolted to the floor. Wanting to be able to move it, I cut a piece of 3/4 inch plywood a little longer and wider then the base footprint and installed 4 inch tall Harbor Freight swivel casters on the four corners for ease of movement in any direction, even on floor carpeting. After assembly it was 6 ft 9 inches tall. Now this being a bolted together *skeleton frame* it is prone to twisting and or becoming a parallelogram sideways. To prevent twisting, I fitted a plywood board on the top bolted to the top front and rear angle pieces. To prevent a side-to-side movement required an 8 inch wide piece of scrap aluminum plate bolted to the rear vertical posts. This is easy to do as there are a plethora of precision spaced holes available. There was some very serious thought given to the vertical post design. It has six 90 degree folds done in such a way that the inner edge on each outer side gives a 19 inch opening. However behind it is as inner fold where one can install recessed L shaped brackets. Now the inner fold is about and inch narrower than the outside edge.This allows making a wider shelf that can *float* on top the brackets but can't slide out either end. This was very useful when configuring the instrument arrangement. I also found that with the bottom shelf being just 6 inches above the floor I was able to install more equipment in the same vertical space than in my previous normal sized equipment cabinet. Another bonus with this type of configuration is that it's easier to keep the equipment cool and it's much lighter. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Austron 2100 chassis
Spoken for ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Austron 2100 Frame
The Austron 2100 frame is spoken for. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Austron 2100F Chassis For Cost of Shipping
Yo Bubba Dudes!, I have an nice looking Austron 2100F chassis missing the front panel available for the cost of shipping from 92220. If interested please send me an original email off-list. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Erroneous R390 Post
Yo Bubba Dudes!, My R390 Non A upgrade to the TN list was an error. Thanks to all who replied for pointing it out to me. This shows that late nite posting for me is not wise. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] R390 Non A Upgrade Info Wanted
Yo Bubba Dudes!, Uh being of unsound mind since I'm planning on moving 2,200 miles in the coming future.. Honest honey, this R 390 was just sitting there on ebay at such a low price, it uh just sorta, somehow err, followed me home. So now that I have my 2nd one (and the first one is still untouched after 5 years) ---Yes, please doctor adjust my meds--- Oh yes, where was I? Ms. Pelosi? Ah yes! Now I remember. I am in the process of digitizing the OEM R 390 2 part ski from Andy Morrer's site. This will be a long time coming. What I wanted to do is incorporate in the ski's is information of parts that are problematic. Under-wattage resistors, leaky caps, parts to add or improve or any information of that nature. Or tips or tricks that I can add as annotations. I will add an attribution list for those who contribute even if they are SK. When done I'll make the BIT TIFF image available on several sites or from me. For those who might not be familiar with the BIT type of image it is only black or white no matter what print size is chosen - no smearing. So one can go to Kinko's and for $10 get a 24" X 48" print to put on the wall if needed. So please send me any information you have whenever using an original email and I'll add it to a word file and eventually incorporate it into the final schematics Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps
Yo Bubba Dudes! Wrote: Gosh. This topic comes up at least once every 6 months. Adiligent search of the time-nuts database would turn up amazing things. . . Yep, it does and it always will for at least two reasons. One, we have new people joining the list. Which is great. They're at the beginning of a learning curve and most aren't in the upper echelons of TN knowledge. It's a hobby for them not an extension of their professional lives. But they want to learn and make progress New members aren't aware of the past data base of info, and speaking for myself I never found an easy way to search. If there is an easy way to do so I'm willing to be taught. I learn a lot from the posters even if it is far above my technical skills. If I have no understanding or interest of post(s), I just delete it and keep what interests or is helpful to me. That's as it should be, and hopefully always will be, on a list like this with such a diverse mix of members. Now we all started spending 9 months in a nice warm water bath happily sucking our thumb. Then some dude takes us out, turns us upside down, and slaps us on our butt while saying *Welcome to the world*! Now what we think is: Say what sucker! I was perfectly happy where I was and minding by own business. However, like it or not, we are then at the start of the unending learning curve until our lights goes out figuratively or literally. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] OOPS on my wwv legal post
Yo Dudes, Sorry I didn't completely erase the partial practical WWV example at the bottom of my previous post. For those who might have cared it was how WWV was used to cal overseas 50 years ago. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] WWV and legal issues
Yo Dudes! WWV and all its variations distribute what in the USA is the legal standard of time (from USNO) and frequency (NIST). If one is running a freq cal service IIRC it is a legal requirement to be able to have traceability to WWV. If one was to rely on other sources, one has no guarantee that it 1. It is as accurate as claimed and 2. It can't be *diddled* with accidentally or deliberately. Although GPSDO's are very good and popular, they come from satellites that are vulnerable to damage from earth based resources. When your time and frequency standard(s) is under control on your own physical territory then they stand or fail on their own. After the atom bombing of Hiroshima and Nagasaki, one of the major inventors of the bomb (I don't remember who) went to see US president Harry Truman and essentially told him that the scientists who developed the bomb should have a say of how or when it should be used. Truman is reported to have said for him to leave his office and told an aid that was responsible for his schedule to "never in hell let that (or any other) scientist come to his office to influence American defense policy." Considering its status from both a scientific and political perspective, IMNSHO it will go on as before. To explain the political. No government official wants to see China or the Russian federation tell the world quote: See, the USA can't be trusted for something as important and simple as frequency and time. However we are your friends who you can trust. Unquote. Regards, This is a case of practical use of WWV albeit over 50 years a go the fundamentals are still valid today. At Karamursel Air station TUSLOG 234 I was assigned to the base receiver site. Our base had to purposes. to ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Tracor 527E manual
Yo Dudes, I need a Tracor 527E manual. I have a copy of the A manual. The difference is the A manual utilizes a CRT. The E model uses a panel meter for showing differences. Would buy, or borrow or pay for photo copies TIA Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP cesium beam tube life
Yo Dudes! A while back someone asked about the life of a HP Cs tube. Fromthe HP 5061B Operators Manual: “2.7 The shelf life of the cesium beam tube I twoyears at storage temperatures up to +35 C (+95F) if the ion pump is operated 2 or 3 times a year. If the ion pump is not operated to maintainthe vacuum within the cesium beam tube, the expected shelf life is reduced.” “2.8 Temperature during storage and shipmentshould be limited as follows: a. Maximum temperature: +75 C (167F). Long term storage: +35 C (95F). b. Minimum temperature: - 40 C (-40). NOTE: Whenstoring the HP 5061B for 6 months or longer, set the MODE switch to CS OFF andapply continuous as line power to the instrument. This enables the ion pump to maintain thevacuum within the cesium beam tube with the cesium beam tube off.” Bold emphasis by HP Mysnarky comment about 2.7. Shelf lifeinfers a tube uninstalled in storage. OK,how about a detailed procedure with drawings, for taking the tube and temporarilyrunning the ion pump to extend the shelf life?. Apparently no oneread this comment and thought about its logical implementation. Regards, Perrier ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
