Re: [time-nuts] Is this ocxo salvageable?

On Wed, Apr 9, 2014 at 8:58 AM, David McQuate mcqu...@sonic.net wrote: The output looks differentiated, as would happen if the wire connecting the internal circuit to the output pin became open, leaving only a very small capacitance to couple the square wave out. I agree, I had a similar

Re: [time-nuts] Low cost GPS module for 100ns timestamping error

On Sun, May 4, 2014 at 5:40 PM, Chris Albertson albertson.ch...@gmail.com wrote: Looks like this is all you'd need for most timing projects. Just add your favorite OCXO and some wire. The SPARC (not Spark) is actually a step up from ARM. It was developed by Sun Microsystems (now Oracle) it

[time-nuts] quartz oscillator injection locking

Hi all, what would be the best method to try injection locking a butler common base crystal oscillator (see figure in http://www.eska.dk/oscillator_data.htm for schematic)? Any comment about close-in phase noise performance when adding injection locking to such oscillators? Thanks in advance for

Re: [time-nuts] KO4BB.com

On Sun, Sep 28, 2014 at 6:35 PM, Didier Juges shali...@gmail.com wrote: Thank you for your patience and your support. thank to you for your service! I'm a *nix system administrator since 20 years (well, my job would turn 20 next year actually). So if you ever need any support, just ask. Frank

Re: [time-nuts] Divide by five

Sorry if I hijack the thread... On Sat, Nov 8, 2014 at 5:20 AM, Said Jackson via time-nuts time-nuts@febo.com wrote: Joe, This puppy can go to 166MHz over temp and has standard 100 mil pin spacing if you put it into a socket: ATF16V8C I have not used PALs since 1992 but I used to be

[time-nuts] DCF77 phase modulation receiver

Hi all, has anyone tried to duplicate the following project: http://www.marvellconsultants.com/DCF Any comment? Best regards Frank ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] thunderbolt fault

Hi all, A friend just received a thunderbolt from an ebay seller today and asked me to check it and wire a quick power supply for him. I used a switching power supply, pc-like, just for testing and tried both lady heather and tboltmon. I wired the power lines as the TVB web page, but connected

Re: [time-nuts] thunderbolt fault

Hi Stan, On 2/26/10, Stan, W1LE stanw...@verizon.net wrote: Hello Francesco, After connecting to a known good power supply, active antenna, and computer, give it a chance to warm up and stabilize. After warm up, I get: +5VDC @ 0.250 A +12VDC @ 0.12 A -9VDC @ very low current, just

Re: [time-nuts] nubie querie

On 3/10/10, David Forbes dfor...@dakotacom.net wrote: With regard to the restoration and use of a derelict radio telescope for amateur radio, that's a fine example of amateurs putting themselves to a big task and succeeding. I work on radio telescopes, so I know how big a task that is.

[time-nuts] OT: xtal osc PN

Hello all, sorry for the OT, but the electronic expertise of the group is too good :-) I'm looking for ideas and directions (articles and so on) to realize very good phase noise xtal oscillator, in the range 20-50 MHz for high performance frequency conversion. I would like to understand what

Re: [time-nuts] OT: xtal osc PN

First of all, thanks to John and Magnus for inputs and links, makes a very good start! On 9/18/10, Magnus Danielson mag...@rubidium.dyndns.org wrote: On 09/18/2010 09:48 AM, francesco messineo wrote: Hello all, sorry for the OT, but the electronic expertise of the group is too good :-) I'm

Re: [time-nuts] OT: xtal osc PN

On 9/18/10, Magnus Danielson mag...@rubidium.dyndns.org wrote: On 09/18/2010 02:41 PM, francesco messineo wrote: First of all, thanks to John and Magnus for inputs and links, makes a very good start! On 9/18/10, Magnus Danielsonmag...@rubidium.dyndns.org wrote: On 09/18/2010 09:48 AM

Re: [time-nuts] OT: xtal osc PN

On 9/18/10, Magnus Danielson mag...@rubidium.dyndns.org wrote: A simple PLL is not that complex these days. As long as you have fairly high comparator frequency after dividing down the VCO and reference you could get away fairly easilly. Standard programmable dividers in the TTL family and a

Re: [time-nuts] OT: xtal osc PN

Hi On 9/19/10, Bob Camp li...@rtty.us wrote: Hi Is -195 dbc/Hz floor good enough or is it overkill? I'd say this is obviously overkill, -160 dBc/Hz could be a good compromise. Is -155 dbc/Hz at 100 Hz offset a requirement or is -40 dbc ok? -40 dBc/Hz at 100 Hz is about useless, -150

Re: [time-nuts] OT: xtal osc PN

Hi Bruce, On 9/18/10, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: Another reference on VHF crystal oscillator circuits (if you can read German) is: http://www.axtal.com/data/buch/Kap6.pdf In particular Figures 6.20 and 6.21 on page 23. unfortunately I don't read german, but it seem I

Re: [time-nuts] OT: xtal osc PN

On 9/19/10, Magnus Danielson mag...@rubidium.dyndns.org wrote: Frank, On 09/19/2010 09:35 AM, francesco messineo wrote: Hi On 9/19/10, Bob Campli...@rtty.us wrote: Hi Is -195 dbc/Hz floor good enough or is it overkill? I'd say this is obviously overkill, -160 dBc/Hz could be a good

Re: [time-nuts] OT: xtal osc PN

the PN at your stated offset? Regards - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of francesco messineo Sent: Sunday, September 19, 2010 12:04 PM

Re: [time-nuts] OT: xtal osc PN

On 9/19/10, Bob Camp li...@rtty.us wrote: Hi The key point being that a fixed oscillator will have *much* better close in phase noise than your typical synthesized radio. yes, I agree fully, in facts getting rid of the typical syntesized radio is my final goal :-) First step is the

Re: [time-nuts] OT: xtal osc PN

On 9/19/10, jimlux jim...@earthlink.net wrote: francesco messineo wrote: It's hard to explain why to ones not familiar with weak signal operation between broadcasting signals, but really the noise floor raise a lot when you have some 5 or 6 broadcasts signals in 500 KHz of band (all

Re: [time-nuts] OT: xtal osc PN

On 9/19/10, jimlux jim...@earthlink.net wrote: francesco messineo wrote: Hi Mike, as I said, current plans are for a few frequencies in the 20-50 MHz range. The current project needs 20, 22 and 42 MHz oscillators. But you're multiplying that up, it will be 20log(N) worse... no, I'm using

Re: [time-nuts] OT: xtal osc PN

Hi Mike, On 9/19/10, Mike Feher mfe...@eozinc.com wrote: Well, if one just looks at the spec of the 10811A for relative performance, it is -140 dBc/Hz at 100 Hz offset at 10 MHz. Realistically, probably a little better. From that it would be real easy to generate the frequencies Frank is

Re: [time-nuts] OT: xtal osc PN

Hi Mike, On 9/19/10, Mike Feher mfe...@eozinc.com wrote: Frank - Great idea, so obvious I did not think of it. If you mix the 20 and 22 you will only get 3 dB degradation or still very close to the -131 dBc/Hz relative to the 10811A. As I mentioned before the architecture is relevant. I

Re: [time-nuts] OT: xtal osc PN

. Howell, NJ, 07731 732-886-5960 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of francesco messineo Sent: Sunday, September 19, 2010 4:12 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OT

Re: [time-nuts] Thunderbolt initial check out?

Hello, On Mon, Sep 20, 2010 at 12:21 PM, d.sei...@comcast.net wrote: Between Tboltmon and Ladyheather, you'll see that your unit either works or it doesn't. My bet is that it will work just fine, even if the antenna is indoors- and then you won't be able to stop watching it (esp. with lady

Re: [time-nuts] rockwell gps chipset datasheet?

Hi Roberto, On 2/17/09, Roberto Barrios rbarri...@msn.com wrote: Hi Frank, The Rockwell 11577-11 is found in most TU-DXXX Rockwell-Jupiter GPS receivers. I've never seen anything like a RF switch on them, but you could have a custom or exotic one :). What they do have most times is a

Re: [time-nuts] Rockwell GPS Chipset

On 2/17/09, Tom Clifton kc0...@yahoo.com wrote: Any chance it is a Jupiter? http://www.gpskit.nl/gps-readme.html If so, they are fine receivers. THe header pins are 2mm spcing - same as used on laptop hard drive adaptors It uses the same two chips (at least in one photo of a jupiter I

Re: [time-nuts] Lady Heather question serial error

On 2/21/09, Magnus Danielson mag...@rubidium.dyndns.org wrote: I'm considering a Linux port since I want to reduce my dependency on Windows at all times. before knowing about the existence of lady heather I had started coding a very simple Linux/Unix program that would work much like

Re: [time-nuts] Tboltmon and linux

On Mon, Sep 2, 2013 at 12:23 AM, Paul Alfille paul.alfi...@gmail.com wrote: I want to report that tboltmon works well on linux under Wine. I'm running fedora 19, 64-bit (so the executable is wine64) and tboltmon version 2.6 Getting a com port pointing to a USB serial adapter is it's own

[time-nuts] Help OCXO ID

Hello all, does anyone know what's the OCXO (or else) in this picture? http://www.electronicsurplus.it/open2b/var/catalog/images/1354/0-c26b2bc0-800.jpg I'm trying to understand if it's something worth buying, but I can't find any information on the site other than 5 MHz oven quartz oscillator

[time-nuts] again on GPS antennas

Hi all, seeing this spec sheet: http://www.saderet.co.uk/Admin/Datasheet/New%20antenna_spec.pdf I was wondering why these antennas have so different GPS bandwidth. Does the BW affect performance of a trimble thunderbolt for example? Thanks in advance Frank IZ8DWF

[time-nuts] thunderbolt no UTC offset

Hi all, I just powered on again my trimble thunderbolt after some time without antenna. All alarms are green but the obvious leap second pending. BUT: I can't use UTC time as both tboltmon and lady heather display a No UTC offset message. I don't remember having seen this in the past. What's

Re: [time-nuts] thunderbolt no UTC offset

Hi Hal, On 5/1/12, Hal Murray hmur...@megapathdsl.net wrote: francesco.messi...@gmail.com said: I just powered on again my trimble thunderbolt after some time without antenna. All alarms are green but the obvious leap second pending. BUT: I can't use UTC time as both tboltmon and lady

Re: [time-nuts] thunderbolt no UTC offset

On 5/1/12, saidj...@aol.com saidj...@aol.com wrote: Incorrect, the UTC offset should be sent in the Almanac, the Almanac having a period of 12.5 minutes max. Not one hour. It should take no more than 12.5 minutes to get the UTC offset when sats are properly being received. when I posted my

Re: [time-nuts] Cables dor 10 mHz

On Tue, Jul 31, 2012 at 1:50 AM, Chuck Harris cfhar...@erols.com wrote: Chris Albertson wrote: ... I wonder how many Or maybe more to the point, I wonder how many of us have installed 10base5 cable, and done vampire taps? I think I still have one of the tools around here somewhere...

Re: [time-nuts] Amatuer Radio Information

On 11/25/09, Robert Darlington rdarling...@gmail.com wrote: Out here I'm almost exclusively on HF bands using the modern digital communications modes like PSK31. The first license (Technician) will not get you on the HF bands unless you count 6 meter (50MHz) as HF. well, 6m isn't anything

Re: [time-nuts] HP 105B Modification

Hi all, indeed this is very interesting, can this buffer amplifier be used as a building block for a distribution amplifier for the 10 MHz signal of a thunderbolt? I remember having seen on the list a similar version but with european transistors (like the ubiquitous bc548/bc558?) that are very

Re: [time-nuts] HP 105B Modification

for it currently) and in that case I will use better transistors for sure. Thanks Francesco Bruce francesco messineo wrote: Hi all, indeed this is very interesting, can this buffer amplifier be used as a building block for a distribution amplifier for the 10 MHz signal

[time-nuts] OT: Practical PLL low noise?

Hello all, sorry for the OT, but I know there're many real electronic artists here. As an amateur radio operator I often use transverters, some home made. They usually can be made sigthly better (RF and noise-wise) than japanese transceivers. However often the LO xtal oscillator drifts too much

Re: [time-nuts] OT: Practical PLL low noise?

Hi Bob, On 2/2/10, Bob Camp li...@cq.nu wrote: Hi The first issue - your oscillator may be drifting quite a lot. If so, that's the first thing to check and possibly fix. A reasonable oscillator should be able to hold less than 100 Hz at 42 MHz under normal room conditions. Fixes range

Re: [time-nuts] Low noise PLL for transceiver locking

Hi Murray, On 2/2/10, Murray Greenman murray.green...@rakon.com wrote: Frank, My suggestion would be to try injection locking, rather than a PLL. No change is made to the 22MHz and 42MHz oscillators, except to find a way to inject enough reference power to force them to lock to it.

Re: [time-nuts] Low noise PLL for transceiver locking

Hi Murray, On 2/2/10, Murray Greenman murray.green...@rakon.com wrote: Frank, My suggestion would be to try injection locking, rather than a PLL. No change is made to the 22MHz and 42MHz oscillators, except to find a way to inject enough reference power to force them to lock to it.

Re: [time-nuts] FW: Injection locking

Hi Murray and all, Yes, indeed injection locking looks very interesting, and I started reading around. Seems relatively easy for 22 MHz, but not as easy for 42 MHz (good values should be 6 or 7 MHz, right?). So far the practical circuit I've seen are few, and this would make me lean in favour of

Re: [time-nuts] FW: Injection locking

On 2/2/10, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: However injection locking also works when the frequencies ratios involved are rational numbers. For 22MHz and 10MHz, the corresponding ratio is 11/5 a rational number. For 42MHz and 10MHz, the frequency ratio is 21/5 a rational

Re: [time-nuts] OT loosing things

The answer is much simpler: the object's wave function (quantum mechanics) can move the object, albeit with little probability :-) Best regards Frank On Fri, Nov 12, 2010 at 3:18 PM, Steve Rooke sar10...@gmail.com wrote: I liked the idea of fairies being the culprits but each to their own :)

Re: [time-nuts] Got 60HZ?

Hello, On Thu, Dec 9, 2010 at 5:13 AM, Michael Poulos poulo...@gmail.com wrote: Recently I bought a Efratom Ru frequency standard from eBay and a frequency divider chip that makes 1MHZ,100KHZ,25KHZ,10KHZ,100HZ and a 1HZ output. Today I thought of a way to make a nice 60HZ so you can use a

Re: [time-nuts] What's the best way to double 10 MHz to 20 MHz ?

On Fri, May 27, 2011 at 6:10 PM, Mark Spencer mspencer12...@yahoo.ca wrote: Imho phase noise is probably as important as long term stability in this application. for real and serious amateur radio dxing it's much more important the phase noise and IMD3 performance of the RX rather than

Re: [time-nuts] Strange temperature peak

Hi Alberto, On Fri, May 27, 2011 at 8:45 PM, Alberto di Bene dib...@usa.net wrote: I left my Thunderbolt running with Lady Heather started. Returning after a few hours in the room, which is at a constant temperature (underground, no heating, no air conditioning), I found the following plot

[time-nuts] tyco electronics A1025

Hi all, I've just found an old anti-theft system (I think) for cars . It has a tyco electronics A1205 gps module. I've been unable to find any information about this module, other than it should be a 3.3V 12 channel GPS module with serial NMEA output. Does anyone have any informations about it?

Re: [time-nuts] tyco electronics A1025

On Sun, Dec 14, 2014 at 3:46 PM, Bob Camp kb...@n1k.org wrote: Hi On Dec 14, 2014, at 6:03 AM, Francesco Messineo francesco.messi...@gmail.com wrote: Hi all, I've just found an old anti-theft system (I think) for cars . It has a tyco electronics A1205 gps module. I've been unable

Re: [time-nuts] tyco electronics A1025

On Sun, Dec 14, 2014 at 6:12 PM, Bob Camp kb...@n1k.org wrote: It’s unlikely that a consumer targeted GPS has a good dedicated PPS out of it. Finding one that will do position hold is even less likely. You can get modules that will do both for $20 and have a documented interface. that's

Re: [time-nuts] tyco electronics A1025

On Mon, Dec 15, 2014 at 9:09 AM, Brian Inglis brian.ing...@systematicsw.ab.ca wrote: On 2014-12-14 10:29, Francesco Messineo wrote: The A1029, which is a newer model, has indeed a PPS output and I've been able to find a datasheet for it but the pinout isn't anything like the A1025. I planned

Re: [time-nuts] tyco electronics A1025

I reply to myself, On Mon, Dec 15, 2014 at 2:41 PM, Francesco Messineo francesco.messi...@gmail.com wrote: I've found a couple of articles saying the A1025 indeed has PPS output as I suspected. However, none of them reports any hint about the pinout of this module. The module itself

[time-nuts] PPS delay on rockwell

Hi all, I'm testing a custom (and unknown to me) GPS board I had for free some years ago. It has a 10 KHz output and 1 PPS output. Using a thunderbolt as reference, 10 KHz output is abut 13 mHz higher (10 MHz output of the thunderbolt is the time base of the counter, HP-5386A). I measured the PPS

Re: [time-nuts] PPS delay on rockwell

On Sun, Feb 15, 2015 at 10:34 PM, Hal Murray hmur...@megapathdsl.net wrote: francesco.messi...@gmail.com said: I measured the PPS output with an HP-5328B, PPS of the thunderbolt as start, rising edge, rockwell PPS as stop, rising edge. The delay is 406.3 ms +/- 30 uS. Are those numbers

Re: [time-nuts] HP5328A HP5328B

On Thu, Apr 23, 2015 at 9:13 PM, Charles Steinmetz csteinm...@yandex.com wrote: Magnus wrote: Would be fun to have a GPIB interface in the HP5328A ??? I have 6 or 7 of these, and they all have HPIB interfaces. It was option 011 for the 5328A. I believe all 5328Bs had HPIB as standard.

Re: [time-nuts] The Symmetricom GPS Antenna's

Same here, shipping costs to Italy were quoted at $65, no joy. I'll try to make some US friend buy one and re-send with cheaper method, if possible. On Fri, Oct 2, 2015 at 7:36 PM, Roy Phillips wrote: > For we Europeans, British in my case, the Symmetricom GPS antennas

Re: [time-nuts] OT: Eagle PC CAD now Autodesk, $500/year

On Fri, Jan 20, 2017 at 4:52 AM, Richard (Rick) Karlquist wrote: > Off topic, but probably a lot of disgrunted Eagle users on this list. > Its official, you will now have to pay $500 per year for a > professional license from Autodesk. The spin meistering of the >

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

1818-2295A dump has been uploaded to ko4bb site, probably there's need to be moved in the right place before it's available. On Mon, Oct 10, 2016 at 9:32 AM, Francesco Messineo <francesco.messi...@gmail.com> wrote: > Hi Dave, > right, once I find the dumps, I'll upload them. >

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

R1DX > dit dit > > On 10/10/2016 3:20 AM, Francesco Messineo wrote: >> >> I have a dump of the 1818-2295A somewhere, it should be archived in >> one of my backups. I also made a replacement with a board having 2 x >> 28C64 SO-28 eeproms and it worked in my 59309A as f

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

nd with logic analyzer > watching the EEPROM it should be possible to follow along. It is a nice > little computer with constant time instructions, 64 bits of RAM. Each > instruction contains a conditional qualifier along with the next address, > very 1960s. > > > >> On

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

I have a dump of the 1818-2295A somewhere, it should be archived in one of my backups. I also made a replacement with a board having 2 x 28C64 SO-28 eeproms and it worked in my 59309A as far as I could test it. However these eeproms present many glitches on the outputs during address toggling, so

Re: [time-nuts] J06 HP-59992A time interval calibrator for HP-531xx counters

On Sun, Jul 9, 2017 at 2:15 AM, Mark Sims wrote: > > So far my design is tending towards: 10MHz ref input -> Minicircuits doubler > -> Wenzel squarer -> 74AC74 divider -> 74AC04 buffer -> level shifter. The > doubler/divider might not be needed, but I think it will give