Re: [time-nuts] Disciplining a TCXO
On Fri, 26 Oct 2012 11:46:35 +1100 Tom Harris celephi...@gmail.com wrote: I have been asked the viability of using a vanilla TCXO, with an accuracy of +/- 0.5ppm (+/- 15 secs per year) that is disciplined occasionally (perhaps only once a month) with a GPS module. The application is for an analogue clock, which powers up a GPS module every so often to learn the drift characteristics of the TCXO, which it then compensates to generate indicated time. The TCXO's that I have played with have a very predictable aging characteristic over time, at least in a normal home/office environment. Hmm... The feasability of this depends a lot on your temperature variations and the TCXO. If you have a nearly constant temperature, then the aging will dominate. If you don't have constant temperature, then the semi-random variations due to the temperature correction errors will make it hard to really predict what's going on. Yes, you can filter out a long term average, but nothing says that this will be the same for the next measurement period if it's dependend on the temperature variations. Modeling those errors is difficult and not realy for the faint of heart, even if you know what type of frequency correction is used. For a general TCXO it gets very tedious to calculate. Of course, if you need only a crude accuracy, then a simple average error correction might be enough. Attila Kinali -- The trouble with you, Shev, is you don't say anything until you've saved up a whole truckload of damned heavy brick arguments and then you dump them all out and never look at the bleeding body mangled beneath the heap -- Tirin, The Dispossessed, U. Le Guin ___ 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] Timing performance of servers
If you cannot see the horizon because of obstructions (what else?), these obstructions are likely to be a source of multipath. So while technically you do not need to see the horizon, any obstruction above the horizon could cause problems. Of course, distant trees or a hill are less likely to be a problem than your neighbor's garden shed with a tin roof. Also, some antennas are better at rejecting low angle signals than others. While the software can reject some undesired signals, it can only do so if the software can identify them as separate. If the multipath signal destructively interferes with the desired signal, there is not much the software can do. Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Rob Kimberley robkimber...@btinternet.com To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Thu, 25 Oct 2012 2:25 PM Subject: Re: [time-nuts] Timing performance of servers We used to filter out anything 10 - 20 degs above the horizon when setting up timing receivers. Typically there's a lot of noise down low (multipath and tropo effects). As long as you've got plenty of SVs you don't need to go way down to the horizon. Rob Kimberley -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: 25 October 2012 20:09 To: li...@lazygranch.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Timing performance of servers On Thu, Oct 25, 2012 at 11:02 AM, li...@lazygranch.com wrote: The GPS seeing the horizon isn't required. Those satellites are filtered out by software. OK, technically it needs to see down to within 10 degrees of the horizon. But when you are choosing a location for the mast to the horizon or withing 10 degrees of it looks pretty much the same. I don't want a huge tree of building due south of the antenna. But for timing all you really need is to see most of the sky. It depends on if you want it to work or work as well as it can. Chris Albertson Redondo Beach, California ___ 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 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 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] Timing performance of servers
On Fri, 26 Oct 2012 08:06:49 -0500 shali...@gmail.com wrote: Also, some antennas are better at rejecting low angle signals than others. While the software can reject some undesired signals, it can only do so if the software can identify them as separate. If the multipath signal destructively interferes with the desired signal, there is not much the software can do. Even if it's not destructively interfere, there is a certain time delay in the reflected signal. This will slightly shift the peak of the correlation function and thus change the detected phase of this satelite. And of course, this shift is not constant and different for each satelite. Attila Kinali -- There is no secret ingredient -- Po, Kung Fu Panda ___ 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] Timing performance of servers
On 26 Oct, 2012, at 08:06 , shali...@gmail.com wrote: If you cannot see the horizon because of obstructions (what else?), these obstructions are likely to be a source of multipath. So while technically you do not need to see the horizon, any obstruction above the horizon could cause problems. Of course, distant trees or a hill are less likely to be a problem than your neighbor's garden shed with a tin roof. Though, as I understand it, typical low-end GPS antennas are quite sensitive to multipath arriving from below the horizon as well. I think getting a sharp antenna cutoff at the horizon is the reason that high-end antennas have choke rings. Also, some antennas are better at rejecting low angle signals than others. While the software can reject some undesired signals, it can only do so if the software can identify them as separate. If the multipath signal destructively interferes with the desired signal, there is not much the software can do. Given that the transmitted C/A bandwidth is greater than 1 MHz, however, I'm not sure that it is possible for multipath signals to destructively interfere across the entire bandwidth; I think the issue is distortion, with some frequencies in the bandwidth suffering destructive interference while others are constructively interfered with. This can be compensated for in software, though it is much better not to have to. Dennis Ferguson ___ 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] Timing performance of servers
Hi If we are talking about timing performance of normal servers, multipath really isn't much of an issue. Unless you are running an OS with real time code (as in *not* Windows and *not* standard Linux) the timing stability isn't good enough to be bothered by the level of distortion that multipath injects. Yes, I have a fleet of Soekris NTP's that get around all that stuff. I would not call them servers. Yes, on an unloaded box you get pretty good numbers almost regardless of what you run. A server doing no work also isn't something I would call normal. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Dennis Ferguson Sent: Friday, October 26, 2012 1:53 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Timing performance of servers On 26 Oct, 2012, at 08:06 , shali...@gmail.com wrote: If you cannot see the horizon because of obstructions (what else?), these obstructions are likely to be a source of multipath. So while technically you do not need to see the horizon, any obstruction above the horizon could cause problems. Of course, distant trees or a hill are less likely to be a problem than your neighbor's garden shed with a tin roof. Though, as I understand it, typical low-end GPS antennas are quite sensitive to multipath arriving from below the horizon as well. I think getting a sharp antenna cutoff at the horizon is the reason that high-end antennas have choke rings. Also, some antennas are better at rejecting low angle signals than others. While the software can reject some undesired signals, it can only do so if the software can identify them as separate. If the multipath signal destructively interferes with the desired signal, there is not much the software can do. Given that the transmitted C/A bandwidth is greater than 1 MHz, however, I'm not sure that it is possible for multipath signals to destructively interfere across the entire bandwidth; I think the issue is distortion, with some frequencies in the bandwidth suffering destructive interference while others are constructively interfered with. This can be compensated for in software, though it is much better not to have to. Dennis Ferguson ___ 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 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] Timing performance of servers
On Fri, 26 Oct 2012 12:53:02 -0500, Dennis Ferguson dennis.c.fergu...@gmail.com wrote: Also, some antennas are better at rejecting low angle signals than others. While the software can reject some undesired signals, it can only do so if the software can identify them as separate. If the multipath signal destructively interferes with the desired signal, there is not much the software can do. Given that the transmitted C/A bandwidth is greater than 1 MHz, however, I'm not sure that it is possible for multipath signals to destructively interfere across the entire bandwidth; I think the issue is distortion, with some frequencies in the bandwidth suffering destructive interference while others are constructively interfered with. This can be compensated for in software, though it is much better not to have to. Dennis Ferguson I thought the problem for GPS was not frequency selective fading caused by multipath but locking onto the delayed signal and generating the wrong range to the satellite. ___ 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] Neat Mini ovenized vcxo!
Thought I'd repost this with a different subject line as I think more members will see it now! Found this neat mini Ovenized VCXO on the auction site. Check out item # 310380778466 and the data sheet at: http://www.microcrystal.com/CMSPages/GetFile.aspx?nodeguid=8f7cfa22-c317- 41e3-ad42-475b1853f14f Corby NetZero now offers 4G mobile broadband. Sign up now. http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1 ___ 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] Neat Mini ovenized vcxo!
Yes indeed I know these well they are used in the Odetics GPStar rcvr. They can be disciplined quite well. Also fast warmup and the power goes down pretty quickly. Regards Paul On Fri, Oct 26, 2012 at 5:44 PM, cdel...@juno.com wrote: Thought I'd repost this with a different subject line as I think more members will see it now! Found this neat mini Ovenized VCXO on the auction site. Check out item # 310380778466 and the data sheet at: http://www.microcrystal.com/CMSPages/GetFile.aspx?nodeguid=8f7cfa22-c317- 41e3-ad42-475b1853f14f Corby NetZero now offers 4G mobile broadband. Sign up now. http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1 ___ 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 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] Neat Mini ovenized vcxo!
On 10/26/2012 11:44 PM, cdel...@juno.com wrote: Thought I'd repost this with a different subject line as I think more members will see it now! Found this neat mini Ovenized VCXO on the auction site. Check out item # 310380778466 and the data sheet at: http://www.microcrystal.com/CMSPages/GetFile.aspx?nodeguid=8f7cfa22-c317- 41e3-ad42-475b1853f14f I've used a variant of this one, I haven't checked all the details. Never the less, it does a good job and many competing products eat the dust for the size and price. They are heavier than any competing product in this size I have seen, but then you have to recall that the AT-cut crystal rod is burried inside a FR-4 casket giving thermal mass, and this is somewhat floating from the surrounding metal case. The result being better ability to handle thermal stress in the form of sudden temperature shifts. Cheers, Magnus ___ 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] Neat Mini ovenized vcxo!
Dear Magnus, Thank you. I didn't notice until your last message. Nice opportunity. I immediately grabbed a couple of them. You never know when you will need them. How kind of you to share this information. You have a nice weekend! Edgardo Molina Dirección IPTEL www.iptel.net.mx T : 55 55 55202444 M : 04455 20501854 Piensa en Bits SA de CV Información anexa: CONFIDENCIALIDAD DE INFORMACION Este mensaje tiene carácter confidencial. Si usted no es el destinarario de este mensaje, le suplicamos se lo notifique al remitente mediante un correo electrónico y que borre el presente mensaje y sus anexos de su computadora sin retener una copia de los mismos. Queda estrictamente prohibido copiar este mensaje o hacer usode el para cualquier propósito o divulgar su en forma parcial o total su contenido. Gracias. NON-DISCLOSURE OF INFORMATION This email is strictly confidential and may also be privileged. If you are not the intended recipient please immediately advise the sender by replying to this e-mail and then deleting the message and its attachments from your computer without keeping a copy. It is strictly forbidden to copy it or use it for any purpose or disclose its contents to any third party. Thank you. On Oct 26, 2012, at 5:18 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: On 10/26/2012 11:44 PM, cdel...@juno.com wrote: Thought I'd repost this with a different subject line as I think more members will see it now! Found this neat mini Ovenized VCXO on the auction site. Check out item # 310380778466 and the data sheet at: http://www.microcrystal.com/CMSPages/GetFile.aspx?nodeguid=8f7cfa22-c317- 41e3-ad42-475b1853f14f I've used a variant of this one, I haven't checked all the details. Never the less, it does a good job and many competing products eat the dust for the size and price. They are heavier than any competing product in this size I have seen, but then you have to recall that the AT-cut crystal rod is burried inside a FR-4 casket giving thermal mass, and this is somewhat floating from the surrounding metal case. The result being better ability to handle thermal stress in the form of sudden temperature shifts. Cheers, Magnus ___ 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 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] Neat Mini ovenized vcxo!
I made an offer of 14 pounds each for two of them that was accepted. I wonder what the temperature it runs at is? maybe put it inside another oven that uses a PTC heater. Tom - Original Message - From: paul swed paulsw...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, October 26, 2012 6:13 PM Subject: Re: [time-nuts] Neat Mini ovenized vcxo! Yes indeed I know these well they are used in the Odetics GPStar rcvr. They can be disciplined quite well. Also fast warmup and the power goes down pretty quickly. Regards Paul On Fri, Oct 26, 2012 at 5:44 PM, cdel...@juno.com wrote: Thought I'd repost this with a different subject line as I think more members will see it now! Found this neat mini Ovenized VCXO on the auction site. Check out item # 310380778466 and the data sheet at: http://www.microcrystal.com/CMSPages/GetFile.aspx?nodeguid=8f7cfa22-c317- 41e3-ad42-475b1853f14f Corby ___ 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] WWVB New Modulation scheme...
The frequency of 1190 indicates an AM station. I assume you mean 30 Hz. An error of 30 KHz would attract a lot of attention from Charley. Regards. Max. K 4 O DS. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Woodworking site http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com To subscribe to the fun with wood group send a blank email to funwithwood-subscr...@yahoogroups.com - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, October 26, 2012 12:14 AM Subject: Re: [time-nuts] WWVB New Modulation scheme... I have my 3586b slaved to my Thunderbolt along with a Flex-1500 radio, Racal-Dana counter, Advantest Spectrum analyzer and Gigatronics signal generator. You might be interested to know KEX 1190 in Portland is about 30 kHz low. At least they aren't spewing IBOC lately. -- Chuck Forsberg WA7KGX N2469R 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 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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] Followup (still want a GPS-type NTP refclock)
On 10/17/2012 12:31 PM, Chris Albertson wrote: On Wed, Oct 17, 2012 at 12:50 AM, Sarah White kuze...@gmail.com wrote: Hi again everyone :) Originally I was hoping for a thunderbolt. The control / diagnostic software looked cool, but I couldn't afford the pricetag on one. ...Here's my followup now: Determined I'd love to get my hands on an iLotus m12m. That's just a statement. My heart is set on getting this. Would it be possible to find a kit (new, used or otherwise) with: 1) iLotus M12M timing mode GPS (serial port version) 2) Aprox 10 meter antenna cable with apropriate connector(s) 3) active antenna which can handle being 10 meters from the module 4) power supply for above list, and much needed luck, all for under $100 US Just over $100. the M12M is about $60 new. If you call up and say you are a hobbyist and heard about it on this list. Buy a timing antenna on eBay for about $30 You can use 30 meters of cable TV wire and some N to F adaptors You can power it all with a salvaged power cube. Then you'd need a mast for the antenna made with plumbing parts and misc hardware and a box for the electronics. Maybe $130 if you were carful But if you are really worried about cost buy an older Oncore. The new m12m is only slightly better then the older m12+T that sells on eBay for $35. The two are nearly identical. (See item # 290656401551) then see item # 270881742870 for an antenna You'd be just under $100 if you went this route. I ended up with a TAPR thunderbolt kit within my price range instead of an oncore variant, so it looks like I ended up doing everything on-budget: F-Type RG59 75 Ohm Coaxial Cable (random off-the shelf 50-foot cable with 75 Ohm impedence to match the specs recommended in tbolt manual) ARS-0325 (Type F Female to Type N Male Adapter to match cable end to the antenna) Symmetricom 58532A antenna (found a gently used one on ebay for cheap) Thanks everyone for the advice and other help figuring all this out. Regards, Sarah White ___ 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] WWVB New Modulation scheme...
It would attract a lot of attention from people not finding it at the right place on the dial. On 10/26/2012 10:09 PM, Max Robinson wrote: The frequency of 1190 indicates an AM station. I assume you mean 30 Hz. An error of 30 KHz would attract a lot of attention from Charley. Regards. Max. K 4 O DS. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Woodworking site http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com To subscribe to the fun with wood group send a blank email to funwithwood-subscr...@yahoogroups.com - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, October 26, 2012 12:14 AM Subject: Re: [time-nuts] WWVB New Modulation scheme... I have my 3586b slaved to my Thunderbolt along with a Flex-1500 radio, Racal-Dana counter, Advantest Spectrum analyzer and Gigatronics signal generator. You might be interested to know KEX 1190 in Portland is about 30 kHz low. At least they aren't spewing IBOC lately. -- Chuck Forsberg WA7KGX N2469R 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 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1427 / Virus Database: 2441/5355 - Release Date: 10/26/12 ___ 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] WWVB New Modulation scheme...
Hi Not to mention attention from the guy who *should* be 3 channels over … Bob On Oct 26, 2012, at 10:31 PM, Peter Gottlieb n...@verizon.net wrote: It would attract a lot of attention from people not finding it at the right place on the dial. On 10/26/2012 10:09 PM, Max Robinson wrote: The frequency of 1190 indicates an AM station. I assume you mean 30 Hz. An error of 30 KHz would attract a lot of attention from Charley. Regards. Max. K 4 O DS. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Woodworking site http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com To subscribe to the fun with wood group send a blank email to funwithwood-subscr...@yahoogroups.com - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, October 26, 2012 12:14 AM Subject: Re: [time-nuts] WWVB New Modulation scheme... I have my 3586b slaved to my Thunderbolt along with a Flex-1500 radio, Racal-Dana counter, Advantest Spectrum analyzer and Gigatronics signal generator. You might be interested to know KEX 1190 in Portland is about 30 kHz low. At least they aren't spewing IBOC lately. -- Chuck Forsberg WA7KGX N2469R 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 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1427 / Virus Database: 2441/5355 - Release Date: 10/26/12 ___ 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 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] WWVB New Modulation scheme...
Looks like they _might_ have been 30 _Hz_ out... I had to tune to 1188.97 to get a 1kHz beat in upper sideband mode a few minutes ago but they are within 10Hz of where they are supposed to be now - according to my radio anyway (I just checked the radio against WWV at 5MHz and it was less than 10Hz out). Orin, KJ7HQ. On Fri, Oct 26, 2012 at 7:41 PM, Bob Camp li...@rtty.us wrote: Hi Not to mention attention from the guy who *should* be 3 channels over … Bob On Oct 26, 2012, at 10:31 PM, Peter Gottlieb n...@verizon.net wrote: It would attract a lot of attention from people not finding it at the right place on the dial. On 10/26/2012 10:09 PM, Max Robinson wrote: The frequency of 1190 indicates an AM station. I assume you mean 30 Hz. An error of 30 KHz would attract a lot of attention from Charley. Regards. Max. K 4 O DS. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Woodworking site http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com To subscribe to the fun with wood group send a blank email to funwithwood-subscr...@yahoogroups.com - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, October 26, 2012 12:14 AM Subject: Re: [time-nuts] WWVB New Modulation scheme... I have my 3586b slaved to my Thunderbolt along with a Flex-1500 radio, Racal-Dana counter, Advantest Spectrum analyzer and Gigatronics signal generator. You might be interested to know KEX 1190 in Portland is about 30 kHz low. At least they aren't spewing IBOC lately. -- Chuck Forsberg WA7KGX N2469R 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 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1427 / Virus Database: 2441/5355 - Release Date: 10/26/12 ___ 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 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 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] WWVB New Modulation scheme...
I've used the HP 3586 for measuring AM carrier frequencies as well as my Tek 495P (both referenced to Rb) for higher frequencies such as air band. Some carriers are dead nuts on while others are quite far off (at least to my mind) although I've never found one outside of its required tolerance. It seems possible to measure pretty accurately with these instruments, at least on AM or CW signals, but not sure the best way for FM. I've played with the HP 53310A but haven't set it up for precise measurements yet, or really studied what all it is capable of. Peter On 10/26/2012 11:10 PM, Orin Eman wrote: Looks like they _might_ have been 30 _Hz_ out... I had to tune to 1188.97 to get a 1kHz beat in upper sideband mode a few minutes ago but they are within 10Hz of where they are supposed to be now - according to my radio anyway (I just checked the radio against WWV at 5MHz and it was less than 10Hz out). Orin, KJ7HQ. On Fri, Oct 26, 2012 at 7:41 PM, Bob Camp li...@rtty.us wrote: Hi Not to mention attention from the guy who *should* be 3 channels over … Bob On Oct 26, 2012, at 10:31 PM, Peter Gottlieb n...@verizon.net wrote: It would attract a lot of attention from people not finding it at the right place on the dial. On 10/26/2012 10:09 PM, Max Robinson wrote: The frequency of 1190 indicates an AM station. I assume you mean 30 Hz. An error of 30 KHz would attract a lot of attention from Charley. Regards. Max. K 4 O DS. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Woodworking site http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com To subscribe to the fun with wood group send a blank email to funwithwood-subscr...@yahoogroups.com - Original Message - From: Chuck Forsberg WA7KGX N2469R c...@omen.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, October 26, 2012 12:14 AM Subject: Re: [time-nuts] WWVB New Modulation scheme... I have my 3586b slaved to my Thunderbolt along with a Flex-1500 radio, Racal-Dana counter, Advantest Spectrum analyzer and Gigatronics signal generator. You might be interested to know KEX 1190 in Portland is about 30 kHz low. At least they aren't spewing IBOC lately. -- Chuck Forsberg WA7KGX N2469R 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 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1427 / Virus Database: 2441/5355 - Release Date: 10/26/12 ___ 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 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 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1427 / Virus Database: 2441/5355 - Release Date: 10/26/12 ___ 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] SR620 VCTCXO replacement
unfortunately, the XO supply is limited to 100 mA. that's an awesome find though. I just snagged one. -Eric On Thu, Oct 25, 2012 at 12:59 PM, cdel...@juno.com wrote: Hi, Check this one out! I think it might work as long as the +5 volts can source the oven current required. Your part was 20ma. This one requires About 250 ma during warmup and between 80 and 130ma afterwards. http://www.ebay.com/itm/310380778466?ssPageName=STRK:MEWNX:IT_trksid=p39 84.m1439.l2649 Corby Woman is 53 But Looks 25 Mom reveals 1 simple wrinkle trick that has angered doctors... http://thirdpartyoffers.juno.com/TGL3141/50899a8421dd41a8434a7st01duc ___ 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. -- --Eric _ Eric Garner ___ 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.
