[time-nuts] 2.5 Ghz 12 digit counter project
Did anyone see the article in the December Silicon Chips magazine about building a 12 digit 2.5 GHz counter? It has an option for a GPS 1pps input so you could have some expectation that the last couple of digits mean something. The website only has the article cover page in pretty much unreadable type. -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] 2.5 Ghz 12 digit counter project
Thanks Tom, It wasn't clear to me if they were using the GPS to discipline an internal oscillator or just as a 1 second gate. That diagram was just a little too small for me to make out. Paul > Date: Thu, 27 Dec 2012 13:17:08 -0800 > From: "Tom Van Baak" > To: "Discussion of precise time and frequency measurement" > > Subject: Re: [time-nuts] 2.5 Ghz 12 digit counter project > Message-ID: <5CB6972C54284AFCAD9E209143C6ECD6@pc52> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Paul, > > Thanks for bringing this to our attention. The block diagram of the counter > is at http://siliconchip.com.au/ (also see attached). > > It looks like a standard 1970's gated/reciprocal frequency counter design; > using 4 digits of high frequency prescaler before it goes into the 8 digit > PIC. So the "12 digit" refers to the number of LED's on the front panel. Not > to be confused with the "12 digits per second" spec of a modern > interpolator-based frequency counter. I.e., it's high range, not high > resolution. I see it accepts external 1 Hz gate times from a GPS receiver; > further suggesting the resolution is 7- or 8-digits/sec. Still, a nicely > designed PIC-based casual bench frequency counter. > > If eventually the full article is available online let us know. It would be > an interesting read. > > Does anyone know Jim Rowe (Australia)? A related project of his was the UHF > Prescaler For Frequency Counters > (http://archive.siliconchip.com.au/cms/A_107676/article.html). > > /tvb > > - Original Message - > From: "Paul Amaranth" > To: > Sent: Thursday, December 27, 2012 11:12 AM > Subject: [time-nuts] 2.5 Ghz 12 digit counter project > > > > Did anyone see the article in the December Silicon Chips magazine about > > building a 12 digit 2.5 GHz counter? It has an option for a GPS 1pps > > input so you could have some expectation that the last couple of > > digits mean something. The website only has the article cover page > > in pretty much unreadable type. > > > > -- > > Paul Amaranth, GCIH | Rochester MI, USA > > Aurora Group, Inc. | Security, Systems & Software > > p...@auroragrp.com | Unix & Windows > > > -- next part -- > A non-text attachment was scrubbed... > Name: 2012-12-silicon-chip-12d-freq-counter.gif > Type: image/gif > Size: 38040 bytes > Desc: not available > URL: > <http://www.febo.com/pipermail/time-nuts/attachments/20121227/16bf1891/attachment.gif> > > -- > > ___ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 101, Issue 176 > *** -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] OT, looking for a good science forum
> Message: 4 > Date: Sat, 26 Jan 2013 16:28:19 +0100 > From: Fabio Eboli > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] OT, looking for a good science forum > Message-ID: <5ef3f142b075fcab38182666a4e50...@quipo.it> > Content-Type: text/plain; charset=UTF-8; format=flowed > > Il 2013-01-26 14:58 Bob Camp ha scritto: > > Hi > > > > Platinum RTD's are a pretty good bet for -80C, they hold up well down > > there. For calibration, ammonia and acetylene both have triple points > > in the vicinity. I'd probably try ammonia first, but not for any good > > Doesn't acetylene have a bad habit of dissociate when pure liquid? > > Fabio. > Yes, it's normally stored disolved in acetone. It also spontaneously dissociates if pressures exceed 15 psig or 30 psi absolute. That could put a real damper on your day. -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] Nifty "MINI TIC" for DMTD
I use a set of surgical loupes. For smd work you need 3.5 - 4.0x, but the major problem with cheap ones is a very small depth of field. I have a sec of Galilaen loupes marked 3.5x, but are really 2x. They're good for general work. Once you get into 4x, you're into Keplarian loupes. I have a set of 4.0x with about a 1cm depth of field that were pretty cheap; I'm looking to change those out. The loupes are nice; you get binocular vision and 16-18 inch working distance. Paul > Date: Fri, 8 Feb 2013 13:12:27 -0800 > From: "DaveH" > To: "'Discussion of precise time and frequency measurement'" > > Subject: Re: [time-nuts] Nifty "MINI TIC" for DMTD > Message-ID: > Content-Type: text/plain; charset="US-ASCII" > > Check to see if there are any tech auctions in your area. > > Picked up a nice scope with stand and illuminator for $90 in the Seattle > area. > > Dave > > > -Original Message- > > From: time-nuts-boun...@febo.com > > [mailto:time-nuts-boun...@febo.com] On Behalf Of Dan Kemppainen > > Sent: Friday, February 08, 2013 12:25 > > To: time-nuts@febo.com > > Subject: [time-nuts] Nifty "MINI TIC" for DMTD > > > > We do 0603 and 0402 with IC's at .5mm lead spacing all day > > long. Under > > stereo zoom, it's not an issue. We have 50+ year old techs who build > > this stuff all day... > > -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] lightweight webserver for, e.g., NTP widget
I like to use mongoose http://code.google.com/p/mongoose/ The project page says 50Kb executable, although it balooned up to 63K the last time I built it. > On Feb 11, 2013, at 3:01 PM, Jim Lux wrote: > > > I'm intrigued by the possibility of using a lightweight web server to > > provide a management/user interface to test equipment or appliances (e.g. > > like the NTP server recently discussed, or a box with mixers and counters). > > > > I've built some web interfaces to very small things using Arduinos and > > Rabbits, and it works ok for simple stuff (turning on and off switches), > > but as soon as you start looking at a bit more complexity (e.g. you want to > > move files around), a bit more sophistication on your server seems useful. > > Or, for instance, if you have a DDS you want to program to follow a > > particular sequence of frequencies (e.g. to match a particular Doppler > > profile, in my case). Or a data acquisition application. > > > > The appeal that the "user client" is that any old web-browser is pretty > > generic. > > > > I've done this "sort of" by exposing a directory as a public share (SMB) > > and then "browsing" to that file, using the file:// mechanism, but it seems > > that actually having a real server might be useful (for things like POST > > from a form, for instance) > > > > But, on the other hand, it seems that something like Apache is a bit much > > to manage. > > > > Is there something that runs under Linux on a lightweight single board PC > > (Raspberry pi or Intel Mini-ITX Atom mobos) that isn't too much of a pain, > > and doesn't require you to be a full time web server administrator to make > > it work? > > > > ___ > > 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. -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] 1 pps comparison for 3 GPS receivers
Ran across this paper the other day. http://www.scribd.com/doc/39055898/10-1-1-1-73 Not absolutely rigorous, since the specs of the reference are a bit vague, but interesting. I was interested since I ended up with a pile of Trimble Lassen modules. -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] Contact: Jupiter GPS questions
> Date: Fri, 19 Oct 2012 07:27:39 -0700 > From: Keenan Tims > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] Fwd: Re: Contact: Jupiter GPS questions > Message-ID: <5081635b.9050...@gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > There is an MSP430 port of GCC that works fine, and mspdebug is able to > write the code to the chip via the programming hardware that comes on > the Launchpad boards. TI also provides several free IDEs with code size > limits, if you prefer that route. Definitely not as easy for a beginner > as an Arduino - the chips are more complicated and the documentation a > bit more arcane - but there's still a good community around them and > decent tools available for free. There's also the ST 'DISCOVERY' series. > Much more powerful chips, on a board, with a USB programmer still around > the $10 mark, but coding for ARM is again another step up the difficulty > ladder. > I've built a couple of projects using an Arduino clone. Very easy to get working, there's a complete IDE available and it's pretty simple to set up a standard "make" environment if that's your preference. I'm rather sold on these. I recently picked up a couple of TI LM4F120 evaluation kits. These were $5 each INCLUDING SHIPPING. There's a free gcc based toolchain for those too. If you don't like C, you can use a Basic Stamp. They've been around a long while. -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] TI Chronos watch synced with NTP
This is something I've been thinking of doing. And, TI is running a back-to-school special on the Chronos watch now, < $30 shipped. Looks like this requires manual syncing; I'd like to have it sync whenever it's in range, but that shouldn't be a big deal. Expand the video description to get a link to the source on github. http://www.youtube.com/watch?v=p7fAdWZXn2k -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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] TI Chronos watch synced with NTP
I knew I should have included the link http://e2e.ti.com/blogs_/b/msp430blog/archive/2013/09/01/back-to-school-sale-part-3-ez430-chronos.aspx Write down the correct coupon code and enter it on the payment screen. Paul > From: Chuck Forsberg WA7KGX > > Where can one get this for less than $30 shipped?? > > On 09/04/2013 07:50 AM, Paul Amaranth wrote: > > This is something I've been thinking of doing. And, TI is running a > > back-to-school special on the Chronos watch now, < $30 shipped. > > > > Looks like this requires manual syncing; I'd like to have it sync > > whenever it's in range, but that shouldn't be a big deal. Expand the > > video description to get a link to the source on github. > > > > http://www.youtube.com/watch?v=p7fAdWZXn2k > > > > -- > Chuck Forsberg WA7KGX c...@omen.com www.omen.com > Developer of Industrial ZMODEM(Tm) for Embedded Applications >Omen Technology Inc "The High Reliability Software" > 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 > > > > -- > > ___ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 110, Issue 19 > ** -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software p...@auroragrp.com | Unix & Windows ___ 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.
