Re: [time-nuts] where can I purchase 794.7 nm VCSEL for building CPT rubidium clock?

For experimental use you are probably better advised to use a dye laser or a Fabry-Perot laser as both are available on the surplus market and both are ‘tunable’ and leave the VCSEL till you have a functioning prototype On Jun 11, 2018, at 4:29 AM, Dana Whitlow wrote: I should have written

Re: [time-nuts] Cesium Clock Avialable

Assuming the seals are good, i imagine that a few weeks of ion pump time would put the tube into ‘ready to use’ condition as recall the tube components have been outgassing for the better part of two decades. Content by Scott Typos by Siri On May 19, 2018, at 9:11 AM, djl

Re: [time-nuts] nuts about position

Swiftnav has a centimeter accurate multi band receiver RTK-585. Its about 600 bucks minus antenna. You would need a choke ring antenna to get centimeter accuracy i think but receiver with a quality timing antenna will provide necessary accuracy On Apr 25, 2018, at 8:06 AM, George Watson

Re: [time-nuts] GPS coordinate differences between APRS.FI and Google Maps

DATUM perhaps? Content by Scott Typos by Siri On Apr 20, 2018, at 5:20 PM, Russ Ramirez wrote: This has probably been mentioned before, but there is a significant discrepancy between APRS.FI locations for DMR hotspots for example, and what my Trimble receiver and Google

Re: [time-nuts] Suggest time-and-tech related locations in Switzerland

swisswatchtours.com https://m.myswitzerland.com/en-us/factory-and-technical-visits/clock-and-watch-museum-beyer.html Content by Scott Typos by Siri On Mar 13, 2018, at 5:58 PM, David Witten wrote: My wife and I are traveling to Switzerland for the last week in May. I have

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

On 5065A backup batteries, The Batteries Plus does a good job of rebuilding HP/Agilent battery packs. I paid 125 a couple years ago to have my 5065A pack rebuilt. On Feb 25, 2018, at 2:41 PM, Stan wrote: With all this recent 5065A talk I decided to pull mine out

Re: [time-nuts] The "NAKED" 5065A optical unit

WRT Rb on the envelope, the 5065A has a built in 'cold trap' to recover the Rb into the reservoir, Instructions on use are in the manual Content by Scott Typos by Siri On Feb 21, 2018, at 10:33 AM, Attila Kinali wrote: On Tue, 20 Feb 2018 10:03:20 -0800

Re: [time-nuts] Team of physicists repeats tvb Project GREAT

Well it will fit in a C-130 or any commercial cargo plane by the looks of the trailer.So it could be a flying clock. Content by Scott Typos by Siri On Feb 15, 2018, at 1:02 AM, Michael Wouters wrote: Sorry, missed the last character in the URL:

Re: [time-nuts] Does a frequency counter locked to GPS need to "warm up"?

Yes, You have removed the reference from the warmup but the input circuits still need time to reach thermal equilibrium for most accurate results On Feb 8, 2018, at 3:34 AM, Azelio Boriani wrote: No warmup needed if the counter switches to the external reference.

Re: [time-nuts] Heathkit GC 1000 Most Accurate Question

I've got one as well replaced that pot with 10 turn pot and electrolytic replacement Content by Scott Typos by Siri On Feb 6, 2018, at 9:05 AM, paul swed wrote: Exactly they are the small open air pots. Just one possibility along with the other good suggestions mentioned.

Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

The timecube radios were simple superheterodyne AM receivers. I suspect the group delay of the timecubes will be small and fairly consistent due to the low component count, Yet because of the low quality components performance variability between units will be quite high. A more

Re: [time-nuts] Designing an embedded precision GPS time server

With 1588 switch architecture counts as well because you have two major classes of switch, blocking and non blocking plus buffering etc. Most 'enterprise' switches once the flow is set up directly forward frames from the ingress port to the egress port each of which also tends to have a fairly

Re: [time-nuts] Symmetricom S200 PSU

Check to see if PSU is a symmetricom power supply it MAY be a standard merchant power supply for which replacements are available from newark/digi-key/arrow/ebay etc Content by Scott Typos by Siri On Sep 18, 2017, at 3:21 PM, Clint Jay wrote: Hi Chris, if it's not

Re: [time-nuts] R XSRM Rubidium Standard

ge dated 9/17/2017 8:08:00 A.M. Eastern Daylight Time, > drkir...@kirkbymicrowave.co.uk writes: > >> On 15 Sep 2017 10:45, "Scott McGrath" <scmcgr...@gmail.com> wrote: >> >> Precisely my point, But when purchasing i expect to pay for a > cal

Re: [time-nuts] Z3801A and Z38XX Issues

Connect to a terminal emulator and IDQ it you will either see garbage in which case serial config is wrong and you need to try a new set of values Or using a breakout box connect a scope to the txd and rxd lines and compare pulse widths Content by Scott Typos by Siri > On Sep 16, 2017, at

Re: [time-nuts] R XSRM Rubidium Standard

other > bits of test gear I'd never have been able to afford any other way, saving > thousands over what even tatty examples from equipment brokers would have > cost. > > Yes, you can get bitten and buy a complete POS but you can also take > sensible precautions and get barg

Re: [time-nuts] R XSRM Rubidium Standard

Its an unrealistic expectation that equipment from the well known auction site will work and be 'in-cal' Its realistic to anticipate several the purchase cost to get well priced instruments back 'in-cal'. But hey if i spend 2 k on a sweeper 3 k to fix and cal it and BlahTest is charging 10k

Re: [time-nuts] Restoration of a 5065A - Continued (Ulf Kylenfall)

t. I have done this several times on > different FRS units. > > Wow now you have 2 5065s. Nice. > Regards > Paul > WB8TSL > >> On Tue, Sep 12, 2017 at 5:16 PM, Scott McGrath <scmcgr...@gmail.com> wrote: >> >> I would say fix both units >> &

Re: [time-nuts] Restoration of a 5065A - Continued (Ulf Kylenfall)

I would say fix both units The color of the bulb is simply Rb vapor condensed on the walls of the envelope. 10811 units are fairly common at good hamfests and ebay Content by Scott Typos by Siri > On Sep 12, 2017, at 4:54 PM, Ulf Kylenfall via time-nuts > wrote: > > >

Re: [time-nuts] Machining some aluminum help!

> On Aug 7, 2017, at 10:36 AM, Joseph Gwinn <joegw...@comcast.net> wrote: > >> On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-requ...@febo.com wrote: >> >> -- >> >> Message: 2 >> Date: Sat, 29 Jul 2017 20:57:56 -

Re: [time-nuts] Machining some aluminum help!

Kerosine is a better tap lube for Aluminum as it is more persistent and less flammable Content by Scott Typos by Siri > On Jul 29, 2017, at 6:41 PM, Joseph Gwinn wrote: > >> On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-requ...@febo.com wrote: >> Send time-nuts mailing

Re: [time-nuts] Software for Spirent GSS4100 GPS simulator

As a spirent user in another context Most Sprient software is supplied only if you subscribe to software maintenance which is understandable due to the limited customer base and the concomitant small pool of possible revenue they simply cant afford to give software away. > On Jun 25, 2017,

Re: [time-nuts] Powering up a long inactive 5061A

First you will need to power it up in Cs Off state and monitor the ion pump current by periodically switching to Cs On If you have a possibly good tube ion pump current should drop to zero in a few days to 3 weeks Thats your first step > On Jun 15, 2017, at 2:02 AM, Hugh Blemings

Re: [time-nuts] Frequency counter questions

The heterodyne trick has been done before the first 'Modern' frequency counter the HP 5245 used plug ins to extend its range to 18 Ghz by doing exactly that. The plug in contained a tunable LO mixer and indicator to show tuning lock These were a pain to use but they beat the 'frequency

Re: [time-nuts] HP8640

Ulrich I have an operational 8640 Content by Scott Typos by Siri > On Jun 7, 2017, at 11:35 AM, Dave Daniel wrote: > > There is, or was, a member of the Yahoo hp_agilent forum who was making metal > replacement gears for the HP8640. I believe several members replaced the

Re: [time-nuts] Two pieces of old General Radio Freq. Nuts

The GenRad 874 connector was good to 4.5 Ghz and took a Banana plug in the center conductor without changing electrical characteristics!!! http://www.ietlabs.com/pdf/GR_Experimenters/1948/GenRad_Experimenter_Oct_1948.pdf Not bad for a connector designed in 1948! It was largely supplanted

Re: [time-nuts] Machining some aluminum help!

Corby Unless you have the tubing and plates machined flat they will leak as the tubing sides are not guaranteed to be flat and parallel wrt each side and aluminum plate stock is not flat unless you purchase 'tooling plate' which is ground parallel on both sides So creating a seal is

Re: [time-nuts] Machining some aluminum help!

Content by Scott Typos by Siri > On May 18, 2017, at 4:34 PM, wrote: > > Well that generated a lot of advice and thanks for it! > I think I might do it myself and go with a 1/2" hole depth and 1/4" > threaded depth. > I'll get some of that Aluminum Tap

Re: [time-nuts] Machining some aluminum help!

If you need pressure moisture tightness you are going to want to have machinist mill tube ends and plates flat if you take off say 075-100 thousands deep and .225 thousanths around edge of plate and have machinist predrill holes in cover plate you will have both a tight seal and drill guide for

Re: [time-nuts] Re. DIY atomic "resonator"

One of the challenges with todays new WiFi standards i.e. 802.11ac/ad/ax is the doppler from office fluorescent lighting systems so much so that channel emulators like the Anite Propsim F8 emulate it at various pseudoranges to the AP and STA That said old school noise sources were indeed gas

Re: [time-nuts] Looking for Gen Rad 1101A oscillator/parts

The Harvard collection of scientific instruments has one BTW http://waywiser.rc.fas.harvard.edu/view/objects/asitem/People@5686/57/displayDate-asc?t:state:flow=028d1ae2-7ea9-4238-9161-a1bf858d81d8 You might to contact them and see if they have any documentation and or photos they can share

Re: [time-nuts] HP-59309A Clock counts only seconds

A 4011 is an inexpensive part, Mouser still carries them, I would NOT buy a chinese part. Generally ESD mishandling is the cause of short component life Content by Scott Typos by Siri > On Apr 3, 2017, at 7:43 PM, Jeremy Nichols wrote: > > I have a new-to-me HP-59309A

Re: [time-nuts] Time Dilation tinkering

> > Ummm … e …. it’s a gas cell standard. I’d bet there is a pressure effect. > > Bob > >> On Mar 21, 2017, at 7:01 PM, Scott McGrath <scmcgr...@gmail.com> wrote: >> >> Noted >> >> However CSAC not subject to barometric effects as Rb units

Re: [time-nuts] HP5061B Ion Current

John makes a good point about the ionizer filament has anyone done a 'slow start' system for the Ionizer filament? I.e. Limit the inrush current as is done for expensive high power transmitting tubes? > On Mar 21, 2017, at 9:44 PM, Donald E. Pauly wrote: > > It

Re: [time-nuts] Time Dilation tinkering

Noted However CSAC not subject to barometric effects as Rb units are Content by Scott Typos by Siri > On Mar 21, 2017, at 4:18 PM, jimlux <jim...@earthlink.net> wrote: > >> On 3/21/17 12:51 PM, Scott McGrath wrote: >> Or perhaps use the Symmetricom CSAC ... >

Re: [time-nuts] Time Dilation tinkering

Or perhaps use the Symmetricom CSAC ... Relatively expensive but might work > On Mar 21, 2017, at 8:08 AM, Attila Kinali wrote: > > On Tue, 21 Mar 2017 13:38:51 +1100 > Hugh Blemings wrote: > >> This got me to wondering if a Rubidium based standard might

Re: [time-nuts] Antique precision timing device without electronics

For the bulb you can probably replace it with a W1A or AR-1bulb which is an argon bulb commonly used in old school contact printers they have a purple hue and also emit long wave UV light I doubt if they are still manufactured but a photo shop or studio or chemist shop which developed film

Re: [time-nuts] Bye-Bye Crystals

>From the tone of the letter it sounds like the bank cancelled line of credit, > Which is stupid given that much of their line is military which is getting a huge boost in spending > On Mar 11, 2017, at 4:56 PM, Bryan _ wrote: > > Disappearing or manufacturing just

Re: [time-nuts] HP5328A + NI GPIB-ENET/1000

The issue with talk-only is you don't have remote control of instrument settings hence talk only Content by Scott Typos by Siri > On Feb 24, 2017, at 11:47 AM, James Peroulas wrote: > > Thanks for the suggestions Scott(s)! > > It ended up being something simple. With no

Re: [time-nuts] HP5328A + NI GPIB-ENET/1000

'Talk Only' mode responds to serial poll mode which is querying all instruments on the bus. And it's primary use is in automated test systems You want to disable talk-only mode for normal interactive control of an instrument using GPIB Content by Scott Typos by Siri > On Feb 23, 2017, at

Re: [time-nuts] HP5065A Rubidium question

Get the manual because if it's been off a long time the RB migrates out of the reservoir and coats the bulb so light does not escape There is a built in 'cold trap' which is used to return the Rb to the reservoir Using this is version specific and you need a good power supply as you can

Re: [time-nuts] HP 5061A Cesium Beam Std

For a tube which has not been powered up for a long time it can take days or weeks for the ion pump to bring the vacuum back to a normal state. Replacement tubes are available but they are breathtakingly expensive on the order of 22k It's a crapshoot with old Cs tubes but for $400 I'd be

Re: [time-nuts] What to do with a 5061A/5061B with dead NiCds

I would second the UPS idea in addition to rebuilding the internal pack which I see as more of a carryover supply while physically moving the standArd or performing maintenance on the line / 24VDC inputs Content by Scott Typos by Siri > On Feb 6, 2017, at 8:50 AM, Scott McGrath <

Re: [time-nuts] What to do with a 5061A/5061B with dead NiCds

I went with option #2 and opted for batteries plus to rebuild the packs as I recall it was about 80 dollars to rebuild the pack which included a 1 year warranty The problem with moving to lithium batteries is building the battery management system and safety systems needed for the SAFE

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

. As to the tuned receiver mode yes it's VERY poorly documented but I use it in conjunction with an Anechoic chamber to characterize antennas > On Dec 22, 2016, at 5:45 PM, Dr. David Kirkby (Kirkby Microwave Ltd) > <drkir...@kirkbymicrowave.co.uk> wrote: > >> On 22 December

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

Can you use the VNA as a receiver? And determine whether the 100Hz shift is also seen on the VNA > On Dec 21, 2016, at 7:31 PM, Dr. David Kirkby (Kirkby Microwave Ltd) > wrote: > > On 21 December 2016 at 23:42, Dr. David Kirkby (Kirkby Microwave Ltd) < >

Re: [time-nuts] precision timing pulse

You could build a simple one shot using something like a 555 timer IC Or take a input pin from your PiC and use the RTC to drive a routine which changes state of the pin for the duration of test Content by Scott Typos by Siri > On Nov 15, 2016, at 1:57 PM, Chuck / Judy Burch

Re: [time-nuts] Swagelok and metric tubing question

Hi Corby Is there a requirement for a specific alloy? I might have some odds and ends lying around Content by Scott Typos by Siri > On Nov 11, 2016, at 12:51 PM, wrote: > > This sound off topic but it's for a Hydrogen Maser modification! > The EFOS2

Re: [time-nuts] 5071A with ATTENTION flashing

that's telling you that the CBT oven is not up to temp so you could have a failed heater in the tube or the oven controller is malfunctioning The former well you need a new tube which symmetricom will be happy to sell you for a 5 figure price tag. The latter is limited by your repair skills

Re: [time-nuts] Temp/Humidity control systems?

Personally I'd be looking at a commercial ductless heat pump unit Mitsubishi MrSlim comes to mind in your case you would want a 'cartridge' type unit designed for ceiling mount the ones for data center use have humidity control as well. Figure these units will hold +/- 2-3 deg F over long

Re: [time-nuts] COTS cesium standard physics package life

It depends on the beam tube There is a fixed amount of Cs in any given beam tube this pool of Cs is consumed during operation.Once the Cs is depleted the tube will no longer function.It's possible with intermittent use for the tube to run for decades as long as vacuum maintenance is

Re: [time-nuts] HP 105B Battery the saga continues

That NiCad pack is part of the power supply and as Jeremy points out is part of the filter system.And so one needs to restore it as part of the instrument as even the 28V external power supply floats these cells and trips power interruption indicator if lost Power supply is not terribly

Re: [time-nuts] HP-105B Battery Replacement?

Actually the larger SmartUPS series can run for hours providing a large enough battery string is available I have a SmartUPS RM3000 running data rack this has 2 external battery boxes and will run everything for 6 hours. For TimeNuts applications though I'd recommend a Liebert UPS as this

Re: [time-nuts] HP-105B Battery Replacement?

I had my local BatteriesPlus rebuild my pack for my 105B about 4 years ago and it's still working well as I recall the cost was about 175. But I specified use best quality cells. Plus they have the proper battery welder and test gear and they have more vendor clout to get consistently good

Re: [time-nuts] Working with SMT parts.

Yes however since you are simply submitting the circuit design it makes sense that they would hold the Gerber until you bought prototypes as unless you have software to create the Gerber it has value as once you have the Gerber you can have the boards built anywhere.They need to make a

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

Because Velocity Factor determines the time it takes a EM wave to traverse the cable it ALSO shortens the wavelength by the same amount relative to free space this is why coaxial cables can be used as delay lines and why when cutting resonant sections of coaxial cable the Velocity Factor must

Re: [time-nuts] Using the HP 58503a to correct your PC clock

Because people have been trained by marketeers to look for the 'silver bullet' But there are generally only a few methods to accomplish a given task Heck look at the 'cloud' those of us who were using large scale computers in the 80's called it 'timesharing' and the most important app on

Re: [time-nuts] The home time-lab

Charles is correct and most data centers and metrology laboratories operate from power produced by large versions of these systems i.e. From 50KW to megawatts generally backed by one or more generators to carry facility when utility power is not available Content by Scott Typos by Siri > On

Re: [time-nuts] GPS disciplined Mars clock

The Venusian's are feeling left out Content by Scott Typos by Siri > On Jul 9, 2016, at 2:58 AM, Mark Sims wrote: > > To appease our new (hopefully) benevolent Martian overlords, Lady Heather > can now work in Mars time... and I have it running right now while >

Re: [time-nuts] The home time-lab

Best bet is to get 4 6v deep cycle batteries connect in series and connect a high quality power supply capable of supporting planned load and set output voltage to the selected 'float' voltage This will give you a setup which depending on batter rating could give you several days of backup

Re: [time-nuts] Heliostat

Hi Brooke Primary use of heliostats in astronomy is solar observation Content by Scott Typos by Siri > On Jul 2, 2016, at 3:12 PM, Brooke Clarke wrote: > > Hi: > > I recently got an Eastern Science Supply Co. demonstration heliostat, that's > to say it's small enough to

Re: [time-nuts] Cable length calibration

This is highly dependent on the TDR especially ones designed for long twisted pair runs where a high voltage pulse is used to overcome resistive losses Content by Scott Typos by Siri > On Jun 30, 2016, at 10:59 AM, David wrote: > > The Tektronix 1502 uses a tunnel diode

Re: [time-nuts] Cable length calibration

unless you are using hardline and that's subject to humidity unless filled with dry nitrogen under pressure. Content by Scott Typos by Siri > On Jun 30, 2016, at 5:03 PM, Dr. David Kirkby (Kirkby Microwave Ltd) > <drkir...@kirkbymicrowave.co.uk> wrote: > >> On 30 June 2016 at

Re: [time-nuts] Cable length calibration

If the nominal velocity of propagation is known and length is known delay is easily determined mathematically Time Domain Reflectrometry is the usual technique for finding cable length but even there the cables NVP is an essential parameter if you want to compute length but not essential in

[time-nuts] GPS NOTAMS issued for US west coast

All Check the GPS NOTAMs for the west coast apparently USG will be conducting GPS interference testing at NAS China Lake with a radius of 300NM Advisory states GPS unavailable for up to 6 hours at a time >From 6 June to 9 June Sorry on a phone or would have copied NOTAM text

Re: [time-nuts] does anybody have software for the DeLorme LT-20 Earthmate?

I think they speak NMEA 0183 hook one up to the serial port and try 4800,8,1,N and look for the NMEA messages scrolling past. Play with the serial parameters > On Jun 6, 2016, at 12:14 PM, walter shawlee 2 wrote: > > sadly, all the repositories of software for these

Re: [time-nuts] Fw: Optical transfer of time and frequency

I seem to recall that NASA used optical inferiometry at LC39 for time transfer during the shuttle program for the DSN the inferiometry was used to normalize the delays in the fiber distribution system caused by temperature and gravity > On May 5, 2016, at 2:44 PM, Tom Van Baak

Re: [time-nuts] Rpair of an 8662 HP Generator

Silicon investigations repairs them. Google the name for website Content by Scott Typos by Siri On Apr 15, 2016, at 6:38 PM, John Miles wrote: >> My signal generator has a poor, intermittent power supply. The RF >> section is ok. Who can please tell me which company can and

Re: [time-nuts] Does anyone have an inoperable TS2100 they'd part with?

Frequently power supplies in instruments like the TS2100 are standard off the shelf units. I would suggest googling the vendor and part number and of course checking the well known auction site In one case avocent wanted 1800 bucks to fix a terminal server with a dead PS I was able to buy a

Re: [time-nuts] HP Reliability

DMMs, > PSUs, and sig-gens as disposable as cell phones. > > I'm not sure that is a bad thing. > > Bill > > > > On Sunday, February 14, 2016, Scott McGrath <scmcgr...@gmail.com > <javascript:_e(%7B%7D,'cvml','scmcgr...@gmail.com');>> wrote: > >

Re: [time-nuts] HP Reliability

HP's greatest advantage of old was being the largest and best vertically integrated technology company as innovations in one line of business were often applicable to others.This was right down to things as prosaic as packaging and or hybrid circuit design Now Keysight is just another mid

Re: [time-nuts] Calibration procedures - what is normal?

'Normal' calibration is a performance check and adjustments as required Performance checks are applying stimulus and checking instrument response is within the acceptable range. A Full calibration is adjust each parameter to as close as practicable to ideal value and may include new cal

Re: [time-nuts] Fwd: CGSIC: FW: Official Press Release - GPS Ground System Anomaly

What was interesting was in addition to the bump was that the Garmin nav receiver in the car was unable to get a fix until it did a full cold start Content by Scott Typos by Siri > On Jan 28, 2016, at 5:37 PM, Magnus Danielson > wrote: > > Poul-Henning, > >> On

Re: [time-nuts] New Member + Basic Questions

The 8660 is really a sweep generator designed for alignment of IF stages of airband and satellite gear. Hence its odd frequency selections and it's miserable phase noise performance that being said I have a couple of them and the are good generators for general purpose use if you respect

Re: [time-nuts] PM6680 or 53131A for TimePod

5371a is a TI analyzer The time pod itself is used for paying work so it's not available for time nuttery. Content by Scott Typos by Siri > On Nov 16, 2015, at 6:20 AM, Chris Caudle <ch...@chriscaudle.org> wrote: > >> On Mon, November 16, 2015 12:42 am, Scott McGr

[time-nuts] PM6680 or 53131A for TimePod

Hi Which counter would be best for use with time pod I have a chance to buy each at a reasonable prices i.e. < 1000 US Thanks in advance Scott Content by Scott Typos by Siri ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] PM6680 or 53131A for TimePod

used to” thing than anything else. On the 53131 you need to hit the > Run button in some cases. > > I have not watched the prices on the Fluke. I have kept track of the 53131’s. > A “good price” on one > these days is below $600 ( = you may need to shop a bit, but they do show > up)

Re: [time-nuts] PM6680 or 53131A for TimePod

More of a slip as I've noted I have a time pod for work but I'd like to add a small counter for time nuttery as power is not cheap in NE so running the 5371A for long runs can get expensive Content by Scott Typos by Siri > On Nov 15, 2015, at 4:08 PM, Chris Caudle

Re: [time-nuts] Celestial Navigation instruction being reinstated in the US Navy

Or with the appropriate filters you can shoot the sun with a sextant like the old time Mariners did I still have a sextant and still use it along with a copy of Bowditch Content by Scott Typos by Siri > On Oct 26, 2015, at 9:13 AM, Jim Lux wrote: > >> On 10/25/15 9:37

Re: [time-nuts] "Selective availability" af accurate time for Apple users?

I think it has to do more with battery life as the first release of iOS 9 drained battery faster than prior releases and the GPS is expensive from a power standpoint. I think the non watch devices sacrificed precision time for runtime Content by Scott Typos by Siri > On Oct 20, 2015, at

Re: [time-nuts] Possible GPS Interference test

I've been in Seattle when a AWACS has been at Boeing and GPS was non functional when it was on the ground this took out multiple GPS platforms the on board unit in the rental my portable unit plus the one in the iPhone Content by Scott Typos by Siri On Sep 30, 2015, at 6:02 AM, Hal Murray

Re: [time-nuts] Why would Keysight UK uncertainty measuring 1 MHz be as high as 7.6 Hz?

Look at the service manual, the calibration setup listed is usually pretty close to what Keysight is using in their local calibration facility. For an LCR meter I doubt they would be using a time nuts grade counter Content by Scott Typos by Siri On Aug 29, 2015, at 10:02 PM, Bob Camp

Re: [time-nuts] Loran C returning to a station near you...

What GRI is in use I'll fire up my austron as well Central NH location Content by Scott Typos by Siri On Jul 18, 2015, at 1:42 PM, paul swed paulsw...@gmail.com wrote: Bill I will let you know what the Austrons say for signal level. Fact is they locked up fast. My FS700 is taking its time.

Re: [time-nuts] UrsaNav LORAN next test date

The Dymec 100 active antenna systems are also a good choice and don't require a DC block between the Austron and antennas As they are split into an indoor and outdoor unit Content by Scott Typos by Siri On Jul 16, 2015, at 9:09 AM, paul swed paulsw...@gmail.com wrote: Dan I have several

Re: [time-nuts] z3801a - serial help and for sale.

Try going through all the speeds starting at 300. Sounds like a baud rate mismatch to me from the symptoms Also try 8 bits 1 stop no parity Content by Scott Typos by Siri On Jun 10, 2015, at 10:28 AM, David Andersen d...@pobox.com wrote: I'm throwing my hands up in the air - I don't

Re: [time-nuts] iGPS?

Not necessarily, you are assuming a single large jammer you could easily disperse a large number of small narrowband jammers over an area you wanted to deny GPS coverage to via airdrops or artillery and that would effectively deny coverage and make it almost impossible to suppress all the

Re: [time-nuts] time-nuts Digest, Vol 127, Issue 33

The downconverter was used for long runs of cable typical use case was a high rise with data center in basement As I recall it converted the signal to a high level baseband and amplified that whic was good for a thousand feet or so of cable Content by Scott Typos by Siri On Feb 27, 2015,

Re: [time-nuts] What are some cw signal Generators for ATE test?

The Agilent 8340 series might be useful here - little weak in the phase noise area but they offer frequency and power sweeps. And you did say economy was a key requirement Content by Scott Typos by Siri On Jan 17, 2015, at 9:59 PM, Ivan.Cousins ijcous...@frontier.com wrote: time-nuts

Re: [time-nuts] Ventilation of HP 58503A GPS time frequency reference receiver

From pictures bumpers are installed in an inverted position. Reverse them Whoever put this together in CN did not have any idea of how this series of cases are assembled or did not care Content by Scott Typos by Siri On Dec 13, 2014, at 2:08 PM, HP-mini blm-ubu...@slingshot.co.nz wrote:

Re: [time-nuts] Ventilation of HP 58503A GPS time frequency reference receiver

Much of the Malaysian Agilent gear uses this style of case with a wraparound bumper in place of the system II feet and feet are removed when gear is rack mounted. One of my best surplus buys ever was a huge crate of mixed mounting hardware feet / rack flanges etc I've been using that box o

Re: [time-nuts] 1900kHz radiolcation testing on east coast US?

Also hearing in central NH sounds like a new 'Woodpecker' Joy... Content by Scott Typos by Siri On Dec 8, 2014, at 2:24 AM, Chris Wilson ch...@chriswilson.tv wrote: Hello, on 08/12/2014 07:21 you wrote: I'm hearing the same signal in northern New Hampshire. Very strong 73,

Re: [time-nuts] Did a member of time-nuts buy this?

If you could get the rebuild cost to 3-5K there probably would be a market. But that would be more of a vacuum nuts project as high vacuum systems are a black art. You would need to open the physics package with a lathe Remove the Cs residue replace the ionizer and poss the mass spec. Put

Re: [time-nuts] [hp_agilent_equipment] Re: Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.

The 5342A counter and the 5345A counters both predate the 10811A and were originally fitted with 10544A oscillators for the option 1 high stability timebase Once the 10811A was released the instruments were fitted with the 10811A as a production change going forward and service replacements

Re: [time-nuts] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.

Just remove the TCXO the 10811 just plugs in, you will need to add the heater oven indicator wiring and LED indicator which is usually over the power switch The power supply includes the oven supply already Content by Scott Typos by Siri On Nov 27, 2014, at 5:38 PM, Dr. David Kirkby

Re: [time-nuts] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.

mechanical configurations: one is connectorized and the other is not. Didier KO4BB On Thu, Nov 27, 2014 at 5:43 PM, Scott McGrath scmcgr...@gmail.com wrote: Just remove the TCXO the 10811 just plugs in, you will need to add the heater oven indicator wiring and LED indicator which

Re: [time-nuts] HP 5342A (18 GHz) vs 5352B (40 GHz) frequency counters

I've got a few of the 5342s their weak point is the sampler. It can be fixed if you have a die bonder all of mine have the option 1 which is either a 10544 or 10811 depending on vintage The 535x series are nice counters I've got a couple. The bad thing is parts are even less available

Re: [time-nuts] Electrolytic Capacitor Question

I've taken a hybrid approach I'm using an in circuit ESR meter to determine whether cap needs to be replaced Tantalum capacitors usually fail because of running them too close or at rated voltage. HP unlike others in the industry did not tend to do this so I've had a low incidence of

Re: [time-nuts] [Bulk] Re: New Guy, has HP 5061A with DATUM 7105A tube seeks advice

The datum tubes are fairly common as they were significantly less expensive than HP/Agilent tubes and lasted longer First thing as JL notes is to remove battery and charger Just power it up and monitor the ion pump value on the test meter if it drops to zero fairly rapidly the tube may still

Re: [time-nuts] New Guy, has HP 5061A with DATUM 7105A tube seeks advice

Option 4 is the high performance beam tube which traded shorter life for better performance. It referred to the original tube shipped with the standard Not sure about j15 Sent from my iPhone On Nov 6, 2014, at 5:34 PM, Wayne Holder wayne.hol...@gmail.com wrote: Thanks for all the great

Re: [time-nuts] [Bulk] There seems to be something missing from this eBay item.

The only problem with these standards is the tube availability since they have that neat little rom which allows the standard to recognize the tube. So using available non-5071 tubes is a challenge unless someone solved the rom issue But the first one is pretty beat did someone have a bad

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