Re: [time-nuts] suggestions on getting 24 Mhz ?

Thanks Tim. All the best Mark Spencer m...@alignedsolutions.com 604 762 4099 > On May 9, 2018, at 5:38 PM, Tim Tuck <t...@skybase.net> wrote: > > Hi Mark, > > this is a product of Glen VK1XX. > he will have a website with eCommerce up soon and when that h

Re: [time-nuts] suggestions on getting 24 Mhz ?

Hi would anyone be able to point me (off list) in the direction of a bit more information re this device ? Many thanks Mark S m...@alignedsolutions.com 604 762 4099 > On May 8, 2018, at 12:15 AM, Tim Tuck wrote: > > Hi Pete, > > You probably want this... > >

Re: [time-nuts] nuts about position

mably need an accurately surveyed starting point. Mark Spencer m...@alignedsolutions.com 604 762 4099 > On Apr 25, 2018, at 8:06 AM, George Watson <wat...@sierracmp.com> wrote: > > Create your own DGPS? > > Trimble is good at this. > > George K. Watson > K0IW > &g

Re: [time-nuts] TV Signals as a frequency reference

Yes I actually purchased two such devices from Ebay a while back. (They contained nice PRS10 Rb oscillators.) Mark Spencer Aligned Solutions Co. m...@alignedsolutions.com 604 762 4099 > On Mar 31, 2018, at 12:09 PM, Ruslan Nabioullin <rnabioul...@gmail.com> wrote: > >> On

Re: [time-nuts] OCXO Vectron 218Y44442

I've experienced this with products with simple crystal oscillators. (Ie. Tap or bang the unit to get the oscillator to start oscillating.) Mark Spencer m...@alignedsolutions.com 604 762 4099 > On Oct 16, 2017, at 1:10 PM, Vlad <t...@patoka.org> wrote: > > > Hello, &

Re: [time-nuts] GPS Antenna Feed Line Decision

Although not time nuts related I believe this document speaks to some of the practical issues... http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-6297.pdf Mark Spencer m...@alignedsolutions.com > On Sep 3, 2017, at 4:56 PM, Mark Sims <hol...@hotmail.com> wrote: > > Rea

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi. The last time I looked at upgrading my GPS antenna feed line (I'm currently using RG58 style cable) I spent some time looking at the temperature vs propagation delay characteristics of various cables. I also picked up a spool of cloned "LMR400 style" cable but ended up using that for my

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

Nice post Tom. I was also wondering about the replacement hardware vs software patch issue. Just speculation on my part but perhaps changing the software involves an extensive QA / test process, vs swapping out a piece of hardware ? Again this is just pure speculation on my part. Mark

Re: [time-nuts] Power connectors continued

rs for example. The issue of power connectors with locking devices is also in my view quite relevant to time nuts. The dialogue vis a vis power pole connectors has also been one of the best I have ever seen on the Internet. Thanks all Mark Spencer m...@alignedsolutions.com > On Jun 22, 2

Re: [time-nuts] Power connectors continued

n), and this is a product available from ITT > Cannon as well as AMP. > > Cheers, > Magnus > >> On 06/22/2017 08:42 PM, Mark Spencer wrote: >> Sorry if I have caused any un due confusion thru my perhaps incorrect use of >> the terms "cannon" and

[time-nuts] Power connectors continued

ate female contacts was what I perhaps incorrectly referred to as a "XLR" connector. Both were in use in my lab powering time nuts gear. Mark Spencer m...@alignedsolutions.com ___ time-nuts mailing list -- time-nuts@febo.com To uns

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

encountered equipment that allowed for that specific use case via hermaphroditic connectors. It is still a good point however. Mark Spencer m...@alignedsolutions.com 604 762 4099 > On Jun 22, 2017, at 9:25 AM, Richard (Rick) Karlquist <rich...@karlquist.com> > wrote: > > No

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

I believe the "AMP" connectors you are referring to are what I would call a "Cannon" connector. A good choice for that application IMHO. Mark Spencer m...@alignedsolutions.com > On Jun 22, 2017, at 6:47 AM, Bob Bownes <bow...@gmail.com> wrote: > > Right T

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

This good information. Thanks Mark Spencer m...@alignedsolutions.com > On Jun 22, 2017, at 7:27 AM, Mike Seguin <n1...@burlingtontelecom.net> wrote: > > NL2 etc 40A > > They typically run about $3 per connector. I use them on high power Solid > State amps. (VHF and

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

strongly dislike the use of "phono plugs" and PL259 connectors for power supply applications. All the best Mark Spencer m...@alignedsolutions.com > On Jun 22, 2017, at 5:57 AM, Wes <w...@triconet.org> wrote: > > Hi Tom, > > I said I use PPs but

Re: [time-nuts] WTB: GPSDO

hobby use it seems to work ok for me. I've more or less shelved my plans to discipline one of my high end OCXO's via a home brew GPSDO scheme. Mark Spencer > On Mar 14, 2017, at 5:24 PM, Bob Camp <kb...@n1k.org> wrote: > > Hi > > >> On Mar 14, 2017, at 6:33 PM, T

Re: [time-nuts] Smart Phone time display accuracy...?

>From occasional observations of my IPhone 5 using the emerald sequoia emerald >time application the "within 50 milliseconds" claim seems quite reasonable to >me. Mark Spencer > On Mar 16, 2017, at 12:31 PM, Chris Albertson <albertson.ch...@gmail.com> > w

Re: [time-nuts] wifi with time sync

but in my experience it seems to have fallen out of common use these days. All the best Mark Spencer > On Jan 14, 2017, at 11:02 AM, Bob Camp <kb...@n1k.org> wrote: > > Hi > > >> On Jan 14, 2017, at 1:38 PM, Chris Albertson <albertson.ch...@gmail.com> >>

Re: [time-nuts] wifi with time sync

as a "figure of merit." Best regards Mark Spencer Sent from my iPhone > On Jan 13, 2017, at 12:35 PM, Bob Camp <kb...@n1k.org> wrote: > > Hi > > What standard protocol would you recommend I run from the command line on my > computer > to get a quick estimate of

Re: [time-nuts] TICC Timestamping / Time Interval Counter -- Available to Order

Thanks John. I just placed an order. All the best Mark S VE7AFZ Sent from my iPhone > On Dec 7, 2016, at 11:45 AM, John Ackermann N8UR wrote: > > I'm happy to report that TAPR is now accepting orders for the TICC > timestamping / time interval counter. We've placed an order

Re: [time-nuts] Line Voltage - USA

ltage drop on those circuits was negligible. (I also had the electrical service upgraded which involved larger supply conductors to the house which in turn would also have had less voltage drop.) Good luck. Mark Spencer > On Jan 4, 2017, at 5:41 AM, Dr. David Kirkby (Kirkby Microwave L

Re: [time-nuts] new year crashes

but I never had any exposure to those connections. Best regards Mark Spencer > > How can they get a delay that long? Satellite link? > > Fiber is 5 microseconds per km. So 1000 km is 5 ms. > > -- > These are my o

Re: [time-nuts] new year crashes

for "emergency" systems ? Are there "leap second" test sets that non time nuts could use to generate leap second events during pre commissioning tests ? (I'm envisioning some form of NTP server that could generate leap second events on command ?) Best regards Mark Spencer Sent from m

Re: [time-nuts] Line Voltage [Was: Anyone (ideally in the UK) ...]

value by the individuals I've been dealing with. Data collected from UPS systems doesn't seem to be as well accepted. Mark Spencer > On Jan 1, 2017, at 4:14 AM, Dr. David Kirkby (Kirkby Microwave Ltd) > <drkir...@kirkbymicrowave.co.uk> wrote: > >> On 1 Jan 2017 11:1

Re: [time-nuts] How phase stable is rg59 or alternate coax

enum rated RG58. The bulk of my cable run is indoors where the temperature is fairly stable. Regards Mark Spencer > On Nov 21, 2016, at 12:59 PM, Scott Stobbe <scott.j.sto...@gmail.com> wrote: > > When I first took a look at some of the coax datasheets I couldn't find >

Re: [time-nuts] Thinking outside the box a super reference

On a somewhat related note Several years ago I pondering getting a Cs standard. After considering the performance of my references and my stack of time interval counters I concluded that in practice I could more or less get the level of measurement accuracy I wanted by comparing the

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

ve my unit features any humidity control. Hope this is of some interest. Mark Spencer > On Oct 26, 2016, at 10:58 AM, John Ackermann N8UR <j...@febo.com> wrote: > >> On 10/26/2016 1:00 PM, Richard (Rick) Karlquist wrote: >>> On 10/26/2016 8:59 AM, John Ackermann N8UR

Re: [time-nuts] HP 59309A Clock runs, sets via GPIB, but no GPIB output?

Hi in the (probably unlikely) event another tester would help I have a 59309a and a spare prologix gpib / Ethernet adaptor. I may try this code out at some point in any event. Best regards Mark S Sent from my iPhone > On Oct 7, 2016, at 5:15 PM, Tom Van Baak wrote: >

Re: [time-nuts] Need Time Help

In practice I'm not convinced the timing requirements for the JT modes in question are even more than a single order of magnitude more severe than the when I have been timing 15 second sequences on my wrist watch during manual non computer aided weak signal operations. To recap if some one has

Re: [time-nuts] Need Time Help

Yes I'd be curious in knowing more about this as well. I've often observed time differences from other stations of several tenths of a second when running the JT modes on HF. Although I am beginner at EME I have made a couple of EME (earth moon earth) JT65 contacts on VHF without taking any

Re: [time-nuts] A new take on the all-hardware GPSDO concept

Hi Lars. I own a G3RUH (Miller) GPSDO. >From what I can recall While testing mine with my collection of >HP5370B's and my assortment of references the performance of mine while locked >was generally comparable to the one in the link you provided. I never tested >it "un locked." I

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

In my experience the commonly seen UPS's that support external batteries expect you to use the batteries supplied (or at least specified) by the manufacturer. That being said I have come across UPS systems that are designed to work with generic user supplied 12 volt batteries but in my

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

competitor > > 73 > KL6UHN > Alex > >> On 9/15/2016 2:26 PM, Mark Spencer wrote: >> Hi I've run my HP105B (with the old style oscillator) from AC power via a >> consumer grade UPS, 24 Vdc from a lead acid battery bank and briefly from >> the internal batte

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

They do exist. I've seen them in service at Telecom sites outside of the U.S. and Canada. I believe there was a thread re this a few years ago ? Sent from my iPhone > On Sep 15, 2016, at 3:13 PM, Jeremy Nichols wrote: > > Since I have a 12V 100 A-H gelled electrolyte

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

Hi I've run my HP105B (with the old style oscillator) from AC power via a consumer grade UPS, 24 Vdc from a lead acid battery bank and briefly from the internal battery pack with out any notable changes in performance (that being said I can't measure phase noise so this observation may or may

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

as well. Using my HP5370's I've never been able to detect a difference in performance of my OCXO's running on battery power vs AC line power (or DC supplied from an HP linear supply in the case of the BVA.) All the best Mark Spencer Sent from my iPhone > On Jul 8, 2016, at 8:23 AM, Char

Re: [time-nuts] HF frequency counting receiver

To echo the point that Jim Lux made in another post... I'm not sure how those of us who live an appreciable distance from the transmitters can expect to get mili hertz accuracy in light of the HF Doppler shift over long distance paths with restorting to tactics such as simultaneously

Re: [time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A and T-bolt)

That is more or less the same method I use for my amateur radio activities. Home Depot in Canada sells similar 3M products which is helpful during quick weekend projects. Professionally I've seen other methods used but on my own time I like the "splicing tape" covered with super "33 tape"

Re: [time-nuts] A new member & PN test set

Hi Oleg, I'd be interested in seeing more information about your phase noise measurement setup. All the best Mark Spencer VE7AFZ Sent from my iPhone > On Mar 27, 2016, at 1:25 PM, Oleg Skydan <olegsky...@gmail.com> wrote: > > Hi list, > > I am in a process of making

Re: [time-nuts] Fw: 5065

For those of us in Western Canada, I've purchased circular connectors at MRO electronics. Best regards Mark Spencer Sent from my iPhone > On Mar 17, 2016, at 9:29 PM, Clay Autery <caut...@montac.com> wrote: > > Also Allied Electronics... If I knew it was CPCs y'all were

Re: [time-nuts] Best Rubidium Frequency Standard

the best Mark Spencer Sent from my iPhone > On Mar 12, 2016, at 3:11 PM, Charles Steinmetz <csteinm...@yandex.com> wrote: > > jerry wrote: > >> Is there any model-suffix or other identifier that would inform whether a >> used PRS-10 has the PPS sync input feat

Re: [time-nuts] GPS Outage..

ered the time nuts hobby I saw lots of ex Telecom timing gear for sale on the usual auction site. All the best Mark Spencer > On Feb 27, 2016, at 4:51 AM, Bob Camp <kb...@n1k.org> wrote: > > Hi > >> On Feb 26, 2016, at 8:01 PM, Majdi S. Abbas <m...@latt.net> wrot

Re: [time-nuts] Introduction

I've found with my HP5370B's they perform best over a fairly narrow range of input signal levels.(1 to 2 volts If I recall correctly ?) Some experiments might be in order for yours. Virtually all my testing was done with 5 or 10 MHz sine waves so this may or may not be helpful in your

Re: [time-nuts] Abstract for consideration at 2016 New Mexico TechFest

Hi Cash. Here is a bit of a narrative and some comments from an amateur radio perspective. I got into the time nuts hobby as off shoot from amateur radio. I was using a pc sound card to evaluate the frequency stability of some of my ham radios by looking at the change in "beat note" when

Re: [time-nuts] Phase noise from Allan Deviation ?

Yes. I was not overly pleased with the performance of my 2700's. I ended up pulling the PRS10 out of one of them and purchased the breakout connector board from SRS and used the resulting 10 MHz and 1 PPS outputs.From time to time I would sync the unit to one of my GPSDO's using the 1

Re: [time-nuts] RG 6 U couplings

I looked up the part number of the cable I installed and the data sheet says it does have Teflon insulation. It does look different than other Teflon cables I have seen though. My main concern was and is the fire rating. The comments about the phase stability are also of interest. If anyone

Re: [time-nuts] RG 6 U couplings

the interconnection issues if you can live with the impedance miss match. Sent from my iPhone > On Dec 7, 2015, at 11:23 AM, Bruce Griffiths <bruce.griffi...@xtra.co.nz> > wrote: > >> On Sunday, December 06, 2015 10:02:43 AM Mark Spencer wrote: >> I've seen data re delay vs temp

Re: [time-nuts] RG 6 U couplings

Actually I may be misremembering this.Am not sure if the cable I used was Teflon on not. It did have a defined fire rating though, and I was concerned about it's phase stability vis a vis temperatures. Sent from my iPhone > On Dec 7, 2015, at 1:58 PM, Mark Spencer

Re: [time-nuts] RG 6 U couplings

Try not to laugh to hard but the compression connectors and crimper for RG6 style cables I picked up at Home Depot in Canada a few years ago seems to work quite well. I have used high quality pro tools at work over the years (mostly though I watch other people use them on occasion these

Re: [time-nuts] RG 6 U couplings

gt; wrote: > > On Sat, 5 Dec 2015 17:06:03 -0800 > Mark Spencer <m...@alignedsolutions.com> wrote: > >> Over the years I've used a number of CATV style 75 ohm patch cords >> with F connectors, F female to female couplers and F to other connector >> adaptors to distribut

Re: [time-nuts] PRS10 1 PPS Out having random phase jumps

I don't recall ever having this issue with mine. As a general rule though I seemed to have more success using 5 and 10 MHz reference signals vs 1 pps reference signals with my HP5370's and HP5335's when making Adev measurements of 5 and 10 MHz OCXO's. Sent from my iPhone > On Nov 23, 2015,

Re: [time-nuts] UPS for my time rack

Sorry for a somewhat Non time nuts posting but this topic seems to have drawn a lot of interest. I found the Microsoft article fascinating. Thanks for sharing. Re DC power. I've seen some computing equipment that ran from -48 volts DC but to expand on the comments from PHK about DC power

Re: [time-nuts] UPS for my time rack

I've also seen inverter systems that are designed for stand by power use in service at commercial sites in third world countries. Within reason they basically let you run what ever reasonable arrangement of rechargeable lead acid based batteries you want that will supply the required voltage

Re: [time-nuts] UPS for my time rack

Yes this is a complex topic. At one point in my career when I was responsible for the up time of several data centres for a high tech firm I had an Electrical Engineer on my team to (amongst other roles) work thru the various issues pertaining to UPS systems. I recall there were significant

Re: [time-nuts] UPS for my time rack

I'm fortunate that several of pieces of my time nuts gear (including two of my ocxo's) feature backup 24 volt dc power inputs. They were the only things in my house that stayed running during a recent 2 day power outage while I was away. I have two large 12 volt gel cells in series that I re

Re: [time-nuts] UPS for my time rack

Hi over the last 10 years or so I've purchased several consumer / small office grade UPS's from sources such as Staples and Costco. I've never noted any RFI from them but I live in a (rf) noisy urban neighbourhood so any noise they put out is probably hard to notice. Other than occasionally

Re: [time-nuts] UPS for my time rack

A quick comment about "pure sine" devices. At times I operate a portable VHF and up radio system from rf quiet out of the way places. I run almost all the equipment from lead acid storage batteries. I have small 30 dollar inverter I use to occasionally power some equipment that needs 120

Re: [time-nuts] UPS for my time rack

Mark S Sent from my iPhone > On Oct 10, 2015, at 8:26 AM, Mark Spencer <m...@alignedsolutions.com> wrote: > > A quick comment about "pure sine" devices. > > At times I operate a portable VHF and up radio system from rf quiet out of > the way places. I run almos

Re: [time-nuts] New Symmetricom 58532A antennas - Launch3

Hi I have one of the masts, it's just a piece of tubing. According to the instructions that came with my antenna the mast has an outer diameter of 42mm, I would expect a metal supply store could supply a suitable piece of pipe or tubing ? Hex screws in the base of the antenna clamp the

Re: [time-nuts] Z3805 service information ?

nes on different com ports. > >>>> -Original Message- >>>> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark >>>> Spencer >>>> Sent: Tuesday, September 08, 2015 4:41 PM >>>> To: Discussion of precise time a

Re: [time-nuts] Z3805 service information ?

PM, Bob Benward <rbenw...@verizon.net> wrote: > > Can you communicate over RS232? Are you using the Z38xx software? What > does it say? > > Bob > >>>> -Original Message- >>>> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of

[time-nuts] Z3805 service information ?

(: Mark Spencer VE7AFZ ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] HP10811 vs 00105 OCXO

? All the best Mark Spencer On Aug 6, 2015, at 8:37 PM, tim...@timeok.it wrote: here the ADEV of the two oscillator. I have added the Super performance of an HP105B (old oscillator) bought in an Ham fest. Luciano On Fri 07/08/15 03:37 , Bob Camp kb...@n1k.org wrote: Hi HP

[time-nuts] Bliley Crystal TC92 pinouts ?

the crystal to oscillate. It looks to be 1950's to 1970's vintage. Any info would be appreciated. Yes I realize I can probably figure things out with an ohm meter (: but thought I would ask first. All the best Mark Spencer Sent from my iPad ___ time

Re: [time-nuts] Splitters for the GPS antenna

The GPS splitter is spoken for. Thanks Mark Spencer Sent from my iPhone On Jun 25, 2015, at 2:07 PM, Mark Spencer m...@alignedsolutions.com wrote: Sorry for the thread hi jack. I also have a lightly used Symmetricom 58535A dual port (one antenna, two receivers) gps splitter I would

Re: [time-nuts] Greetings from Australia

Hi Brek. In my experience the perceived frequency difference from Doppler shift is of little or no relevance for amateur HF communications. For amateurs involved in activities such as the frequency measurement test I believe it could be at times relevant at HF. There might be a mode where

Re: [time-nuts] Jackson labs fury gpsdo with docxo for sale

, they are only $750 new. Or am I missing something here? R On 26 June 2015 at 03:30, Mark Spencer m...@alignedsolutions.com wrote: Hi I'm wondering if there is any interest in my Jackson labs fury (desktop version) with the docxo option. I purchased it new from Jackson Labs in 2012. It has

[time-nuts] Jackson labs fury gpsdo with docxo for sale

supply it shipped with from Jackson labs. I'm also looking at selling it via some other channels as well so it may be gone soon. Please contact me off list if you are interested in pursuing this. I'm happy to send photos and provide more details to an interested party. Thanks Mark Spencer m

Re: [time-nuts] Splitters for the GPS antenna

. Thanks Mark Spencer m...@alignedsolutions.com Sent from my iPhone On Jun 25, 2015, at 6:18 AM, Cash Olsen radio.kd5...@gmail.com wrote: I initially tried using Dishtv splitters with qualified success. On closer examination the bandpass between dish 1 and dish2 is different and neither

Re: [time-nuts] Small time server for mobile use.

with a board layout and eventual sale to the list members if there is any interest (I'm not asking for interest yet). -Bob On Tue, May 12, 2015 at 11:11 AM, Mark Spencer m...@alignedsolutions.com wrote: Hi sorry for a possibly OT post. Has anyone had practical experience with small commercially

Re: [time-nuts] Small time server for mobile use.

] that mounts directly to the Pi. Cheers! -Pete [1] https://www.adafruit.com/products/746 [2] https://www.adafruit.com/products/2324 -- Pete Stephenson On Tue, May 12, 2015 at 7:11 PM, Mark Spencer m...@alignedsolutions.com wrote: Hi sorry for a possibly OT post. Has anyone had

Re: [time-nuts] Time in a cave

that has been kludged together ? Do you need a Peng or other professional to sign off on the solution ? (In my experience PTP may on occasion be found in industrial settings where a Peng may be required to sign off on the solution.) Mark Spencer On 2015-05-12, at 4:00 PM, Tucek, Joseph joseph.tu

[time-nuts] Small time server for mobile use.

if there is no wireless coverage. This is for a one off project so piecing together various parts is an option but a single box COTS solution would be nice. I've found a few candidates via web searches but would welcome any feed back. Thanks in advance Mark Spencer

Re: [time-nuts] lawnmower robots may be the end of VLF timekeeping

In practice it seems to be hard to fight interference issues at lower frequencies. A local 50,000 watt AM (medium wave) broadcaster, put up a FM (VHF) transmitter several years ago. One of the reasons they gave for going to FM were the interference issues on the AM band. I noticed the

Re: [time-nuts] Tymserve 2100 thinks it's 1995?

as a possible way to breathe a bitmore life into an older piece of equipment. Regards Mark Spencer ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] HP5328A HP5328B option 040

If anyone has a burning desire for a HP5328 with a volt meter module (and a GPIB board) please contact me off list. Regards Mark Spencer Sent from my iPad On 2015-04-23, at 3:18 PM, Bob Albert via time-nuts time-nuts@febo.com wrote: From your comments, it seems that finding a voltmeter board

Re: [time-nuts] June 30 2015 leap second

I've often wondered why more systems don't use TAI or other similar time scales as their time source. If needed the time displayed to end users or third parties could be converted to UTC just prior to presentation or transmittal. For example a financial system that needs to time stamp

[time-nuts] Does adjusting ocxo's degrade adev / madev ?

I've long had a nagging suspicion that OCXO's that are not adjusted will in practice have lower ADEV than ones that are tweaked regularly. Several days ago I noticed that one of my 10811's was performing quite well (I believe this is the first time any of 10811's have delivered adev / madev

Re: [time-nuts] 10 MHz Filters

and radio gear are separate but still in the same house. Mark Spencer On 2014-11-27, at 1:47 PM, Bob Camp kb...@n1k.org wrote: Hi You can also discover interesting things about the transformer it’s self in some circuits. They do what they do, but they also bring along a new set of issues

Re: [time-nuts] lightening protection of a GPSDO system / optical isolated distribution amp

to an electrical service ground. My usual disclaimer of I'm not an expert in this field, the preceding is only my opinion, and don't rely on this applies. Mark Spencer On 2014-11-26, at 2:56 PM, Martin A Flynn mafl...@theflynn.org wrote: On 11/26/2014 5:14 PM, Jim Lux wrote: On 11/26/14, 2:00

Re: [time-nuts] lightening protection of a GPSDO system / optical isolated distribution amp

. Disclaimer I'm not an electrical engineer or lightning protection expert so please don't rely on this comment. Mark Spencer On 2014-11-26, at 2:54 PM, Hal Murray hmur...@megapathdsl.net wrote: albertson.ch...@gmail.com said: The ground rod needs to be bonded to the rest of the building

Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

One of my Z3805's (with the double oven 10811 ocxo iirc) also performs similarly at times to the 58503A mentioned by Said. From an adev perspective it's close to my BVA at some tau's (around a hundred seconds or so iirc.) At times though the output seems to jump in frequency. My other

Re: [time-nuts] 10 MHz OCXO recommendations

against another GPSDO (: Regards Mark Spencer Sent from my iPad On 2014-11-11, at 4:26 PM, Charles Steinmetz csteinm...@yandex.com wrote: Mark wrote: I find the concept of occasionally adjusting a good OCXO which in turn is used as a reference works well for me.I have some

Re: [time-nuts] 10 MHz OCXO recommendations

a good OCXO which in turn is used as a reference works well for me.I have some that haven't needed adjustment for over 2 years (they are still well within one part per billion of being on frequency.) That being said the MV89's were at least fairly in expensive. Mark Spencer On 2014-11-10

Re: [time-nuts] Rb as source for ADEV?

To add a bit to this discussion I recently switched from using from using HP5370B's for long term data collection to HP5335's.   For plotting the long term drift of two of my more stable OCXO's versus a GPSDO  the 5335's combined with Timelab work fine for my limited needs.   Just for grins I

Re: [time-nuts] temperature

frequency shifts in some ocxo's vs temperature changes. I should also start taking humidity measurements as well at some point. Any pointers re suitable instruments to accomplish this that can be sourced via the usual surplus sources would be welcome. Thanks in advance Mark Spencer Sent from my

Re: [time-nuts] time-nuts Question concerning ADEV measurements

Hi Bob, All of my actively used HP5370B's exhibit behavior similar to yours. I routinely use a BVA oscillator as the clock for most of my HP5370B's. I've also done some testing comparing the reported adev of other signals using various references and swapping between the internal

Re: [time-nuts] GPSDO choices

more specfic info feel free to contact me off list and I can try to help. Regards Mark Spencer -- On Oct 3, 2013, at 11:24 PM, Paul tic-...@bodosom.net wrote: Iapos;m looking for a new, ready to go, inexpensive desktop GPSDO.  So far Iapos;ve only found the Fury

Re: [time-nuts] [time nuts] B.V.A. 8600 for sale

During my efforts to find a standard that could serve as reference to help characterize my FTS1050, I went thru a succession of 10811's, several stand alone datum 1000's from the usual auction site, an HP105B, a wenzel from the usual auction site etc and none of them came even close to the adev

Re: [time-nuts] [time nuts] B.V.A. 8600 for sale

:08 PM, Mark Spencer mspencer12...@yahoo.ca wrote: During my efforts to find a standard that could serve as reference to help characterize my FTS1050, I went thru a succession of 10811's, several stand alone datum 1000's from the usual auction site, an HP105B, a wenzel from the usual auction

Re: [time-nuts] Getting a 5370A tomorrow - How do i test it works

input levels for peak performance. Regards Mark Spencer Sent from my iPad ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Warped back to 1993

At least one my Z3805's is also showing a date from 1993. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] 10811 outer oven controller.

Hi, the recent discussion about 10811's with double oven's caused me to take another look at some of the data I've collected from one of my two GPSDO's that uses a 10811 double oven OCXO.   I realize there is much more to the performance of a GPSDO than the OCXO but I  can't say I'm unhappy 

Re: [time-nuts] Lead acid battery noise levels

Eric: http://tf.nist.gov/general/pdf/1133.pdf discusses the noise levels of various batteries. Regards Mark S Message: 6 Date: Wed, 10 Jul 2013 11:11:00 -0700 From: Eric Williams wd6...@gmail.com To: Discussion of precise time and frequency measurement     time-nuts@febo.com Subject:

Re: [time-nuts] Lead acid battery noise levels

directly connected to the battery bank while the batteries are float charged. Best regards Mark Spencer ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

[time-nuts] Lead acid battery noise levels

are not known for low noise levels (: Best regards Mark Spencer ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Question about effect of sample interval on ADEV

Hi, to echo the comments John and Magnus made, I've encountered similar issues in the past when using my HP5370B's to compare my FTS 1050 to other standards.  The fix involved using double shielded RG 400 style cables in my lab (I realize the RG 400 standard is not really a standard any more..) 

Re: [time-nuts] HP and other equipment failure

down this road before I started blowing extra air over them with fans.   In general I agree with the comments about the serviceability of the older HP gear.  I'm hopefull that I can keep at least two of my four HP5370B's working for many years to come.      Regards Mark Spencer

Re: [time-nuts] GSP clock stabilitiy, Rb vs Cs

The article available for download via this URL contains some history about development issues with Rb and Cs Clocks for GPS.   It seems at one point after the GPS system was placed into service a development program for new Cs GPS clocks failed and by necessity there was a shift towards Rb (at

Re: [time-nuts] hp5065b !!!

Hi, while skimming some articles I found re GPS satellites, I found some references to certain buffer gasses in Rb cells working much better with optical filters than others.   As far as I know Rb buffer gas formulations are not disclosed by the manufacturers so I suspect this info may not be

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