Re: [time-nuts] Flashback to 1988 (Austron Catalog)

In message cac2_fprrd0hpwbrqbejvwsiuaq8afrmn1be25wtdqnh+pxy...@mail.gmail.com , Dan Watson writes: The serial-numbered original manual was also included. Inside the plastic wrapping was an Austron catalog from 1988, complete with vintage smell! It is very interesting to look through.

[time-nuts] More BJT gain and frequency curves

On the low noise transistor thread, we got into how BJT transition frequency (f sub tau) and current gain (beta) vary with collector current. I posted graphs of beta vs. Ic for two very common transistors, the 2N3904 and 2N4401 (and their cognates in other packages with other prefixes, MMBT,

Re: [time-nuts] 60Hz line data

I've updated the graph at: http://www.megapathdsl.net/~hmurray/time-nuts/line/Calif-60Hz-2014-2015.pn g and added July-2015 at: http://www.megapathdsl.net/~hmurray/time-nuts/line/Calif-60Hz-2015-Jul.png July 19th shifted 15 seconds in one day! The shift is 25 seconds over July 17-19. --

Re: [time-nuts] Square to sine wave symmetrical conversion (part 2)

Not necessarily. Many oscillator circuits do not deliver a good sine wave to begin with This is very true. However if it is worse than -30dB harmonic sinewave back stream then the oscillator is probably extremely high in phase noise anyway. Since the threshold is off center, the phase noise of

[time-nuts] GPSDO question

Speaking with Tom recently impressed on me just how much I don't know about what's normal for a GPSDO.  The options on the LEA-6T are formidable and have consequences for my GPSDO.  The question I'm struggling with now is what's normal during the survey process?  The only example of a

Re: [time-nuts] 60Hz line data

Hi That correlates quite well with data from the 1960’s before “everybody” was on one big network. Bob On Jul 25, 2015, at 7:25 PM, Hal Murray hmur...@megapathdsl.net wrote: I've updated the graph at: http://www.megapathdsl.net/~hmurray/time-nuts/line/Calif-60Hz-2014-2015.pn g

Re: [time-nuts] GPSDO question

Hi Commercial GPSDO’s are manufactured to a specific customer requirement. The application in the system dictates how it behaves as it it powered up or power cycled. There is no single “always correct” approach. In a Time Nut environment, people seem to be quite happy setting up temperature

Re: [time-nuts] Flashback to 1988 (Austron Catalog)

Sure. I uploaded a scan of the catalog parts to KO4BB. It's listed in Recent Uploads awaiting sorting. As for the 2100F manual, is there a scan available online already? Dan On Sun, Jul 26, 2015 at 2:03 AM, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message

Re: [time-nuts] Suggested Low Noise Transistors

I offer the following for your consideration. Once upon a time - about 1968 Motorola introduced 4 low noise transistors for audio and low frequency applications. There were th 2N5086, 5087, 5088 and 5089. The 5086 and 5087 are PNP and the 5088 and 5089 are NPN. They are almost perfect

Re: [time-nuts] Square to sine wave symmetrical conversion (part 2)

Hi Ummm …. errr…. The oscillator loop has a limiter in it or it’s not going to work very well. You can *easily* get -160 dbc/Hz with an oscillator that has harmonics in the -10 to -20 range. With some tweaking you can get into the 170’s. It’s not the limiting by it’s self, it’s *how* the

Re: [time-nuts] Lab upgrade

Ok - not so bad. One of the 250v 5Amp inside the case blew on the 10v line. Now to work out why... J. On Sun, Jul 26, 2015 at 1:05 PM, Jason Ball ja...@ball.net wrote: Recently I've been on the hunt for test gear so facilitate moving up into the microwave bands (ham radio), accurate

Re: [time-nuts] Who has a copy of:

les...@veenstras.com said: Once apron a time, somewhere in this neighborhood, someone, or possibly more than one, presented documentation of the phase/frequency stability of the local (I think SOCAL) power grid. AS I recall it was able to discern phase changes caused by local substations

Re: [time-nuts] Square to sine wave symmetrical conversion (part 2)

Hi Bob, Help me to understand your remarks. A. The oscillator stage has a limiter. (Agreed.) B. ​You can *easily* get -160 dbc/Hz with an oscillator that has harmonics in the -10 to -20 range? C. But we are not talking about the signal from the oscillator stage itself? D. Tuned buffers can

Re: [time-nuts] 60Hz line data

There have been a number of proposals to completely eliminate manual time correction (used to keep synchronous clocks accurate over long time periods). There apparently was a manual procedure activated when the error reached +/- 30 seconds from true time, but I think that since 2011 the power

[time-nuts] Thunderbolt serial question

Hi, My Datum Starloc recently died after 12 years in service so I am replacing it with a Trimble Thunderbolt.  The Starloc used a DB9 female to female null modem cable but I noticed a minute ago when getting ready to connect the Thubderbolt to my laptop that the Thunderbolt has a female DB9

[time-nuts] Austron 2010B useful in Australia/Sydney at all ?

I can pick one up in excellent condition for a reasonably low price... but only if it could be useful. J. -- -- Teach your kids Science, or somebody else will :/ ja...@ball.net vk2...@google.com vk2f...@google.com callsign: vk2vjb ___ time-nuts

Re: [time-nuts] [Bulk] Thunderbolt serial question

Chris, I'm not in my shop right now but I think it is a standard cable. Don't recall needing a 'null modem' cable for the TBolt. I needed one for the Z3816A. Joe -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Waldrup Sent: Sunday, July 26,

Re: [time-nuts] Lab upgrade

And I have seen them without scorch marks - the tatalums are especially prone to failing with a dead short. Use an ohmeter to confirm that the 10V is shorted to ground and then use a soldering iron and lift one leg of the cap until you find it (them all). 20-30 years is about the magic number.

Re: [time-nuts] 60Hz line data

It's not just synchronous-motor clocks that use line frequency as a time reference. I have a Heathkit alarm clock that counts cycles of line frequency as its timebase. I think that was common in the early generations of NMOS clock chips. The clock does have a backup oscillator (powered by a 9 V

Re: [time-nuts] Flashback to 1988 (Austron Catalog)

Dan next test 6-7 August not much time. What is your location? Paul WB8TSL On Sat, Jul 25, 2015 at 4:02 PM, Dan Watson watsondani...@gmail.com wrote: I bought a nice Austron 2100F this past week. It is very much new old stock. The unit is pristine and powers up just fine. I'll have to get an

Re: [time-nuts] Square to sine wave symmetrical conversion (part 2)

Hi On Jul 26, 2015, at 2:48 PM, jerry shirᴀr radio.n...@gmail.com wrote: Hi Bob, Help me to understand your remarks. A. The oscillator stage has a limiter. (Agreed.) B. ​You can *easily* get -160 dbc/Hz with an oscillator that has harmonics in the -10 to -20 range? yes C. But

Re: [time-nuts] Lab upgrade

Hi Look for electrolytic / tantalum capacitors on the 10V rail with scorch marks…. Bob On Jul 26, 2015, at 12:59 AM, Jason Ball ja...@ball.net wrote: Ok - not so bad. One of the 250v 5Amp inside the case blew on the 10v line. Now to work out why... J. On Sun, Jul 26, 2015 at

Re: [time-nuts] Lab upgrade

Thanks for that Bob. From the circuit diagram the path to ground appears to be on either the 3v the 5v lines that are fed via this fuse. When I disconnect the power supply from the rest of the system the fuse doesn't blow which suggests the fault is in the logic board, of course it could simply

Re: [time-nuts] Square to sine wave symmetrical conversion (part 2)

We seem to have wandered into one of my favorite subjects, oscillators that make very low distortion sine waves. I found this 1960 HP journal article to be most useful: http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1960-04.pdf Best quote:In fact, were it not for [amplifier] nonlinearity,

[time-nuts] 100 Mhz OCXO by PTI FS

I have a few 100 Mhz OCXO by PTI (and other manufactures) that I would like to sell. Trying to fund another project. Email me direct, off list for info. Chris N3IZN ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Thunderbolt serial question

Hi Chris, it's a standard serial cable. Here is a good FAQ on the tbolt at leapsecond: http://www.leapsecond.com/tbolt-faq.htm mg NG7M On Sun, Jul 26, 2015 at 10:47 AM, Chris Waldrup kd4...@gmail.com wrote: Hi, My Datum Starloc recently died after 12 years in service so I am replacing it

Re: [time-nuts] Flashback to 1988 (Austron Catalog)

I don't think there is one. Watch out there is one located I believe on a Chinese site. I was told its actually malware. On Sun, Jul 26, 2015 at 9:49 AM, Dan Watson watsondani...@gmail.com wrote: Sure. I uploaded a scan of the catalog parts to KO4BB. It's listed in Recent Uploads awaiting

Re: [time-nuts] Thunderbolt serial question

Thanks to all who helped me out. I really appreciate it.  . I got it working and now see satellites with Tboltmon program.  Chris KD4PBJ Monteagle, TN — Sent from Mailbox On Sun, Jul 26, 2015 at 10:09 PM, M. George m.matthew.geo...@gmail.com wrote: Hi Chris, it's a standard serial

Re: [time-nuts] Austron 2010B useful in Australia/Sydney at all ?

I've decided to pick up this unit as it is in really nice condition and inexpensive. I'll see if I can pickup the e-loran signals on my ham kit over that weekend to see if there is any point, failing that another member of time buts may be interested. J On Mon, Jul 27, 2015 at 9:27 AM, Jason

[time-nuts] Lab upgrade

Recently I've been on the hunt for test gear so facilitate moving up into the microwave bands (ham radio), accurate timing being one of the basics to be sorted. As part of this I've recently acquired a HP 5335A with OCXO and HP5350B microwave frequency counter, both picked up today. I've setup