Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC
Hal Murray wrote: I assume it was working correctly previously. If not... At least one GPS receiver I've used is off by a second. There is an ambiguity as to whether the time applies to the previous or next PPS. You were correct Hal, the problem with the new firmware for the 18x, is the time relationship between the 1PPS transition and the serial data. My application required the RMC and GGA sentence at 4800 BAUD. So I measured the start and end times of the serial data (with respect the 1PPS). Using version 3.00 firmware on the Garmin 18x, the NMEA data starts 450 ms after the 1PPS transition, and finishes at 740 ms. However using the latest firmware version (3.50) for the 18x, the NMEA data starts at 750 ms and finishes 39 ms into the following second. That is why my software was loading the wrong time. These start and end times of the NMEA serial data change quite a bit as the workload of the GPS changes. There is no mention in all the update notes, that Garmin have changed the timing of the NMEA data with respect the 1PPS transition. Running the same test with my GPS 18, the NMEA starts about 50 ms and finishes 350 ms after the 1PPS transition - nice and reliable! I think the reason my 18x started (in the last few days) to show the wrong time, is that the trees around my house are at the peak of growing leaves (Summer in the Southern Hemisphere) and so this would have caused the GPS to work harder, and so must have delayed the NMEA data enough (with version 3.50) to give the wrong time on the serial data. So the moral of the story, don't expect that a device will be better if you upgrade to the latest version of software. Thanks Hal for your kind pointer - I now understand what is going on, and not to be so excited about new firmware updates. Kiwi Geoff (Christchurch, New Zealand). ___ 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] Form factor
On 12/23/2010 03:05 AM, Chris Albertson wrote: On Wed, Dec 22, 2010 at 3:32 PM, Poul-Henning Kampp...@phk.freebsd.dk wrote: I used a shared opto-isolated async bus. You need two optocouplers per microcontroller, and one place you power the shared bus, and you're all set. I have yet to see an microcontroller without an async port. Opto-isolater? Why not just use fiber cable between cards.I know it sounds exotic but also seems to have half the parts count. those s/pdif jacks are so cheap and I bet you can use them as pretty much drop in replacements for opto-isolators. Would s/pdif jacks work as a physical layer? Really I just used I2C in my write-up as a place holder. I you say nothing no one ever says a blank paper is wrong and suggests something better. Using a serial interface is nice, but I2C is not the one of my choosings. I'd go for plain serial interface, RS-232 like, but not necesserilly with RS-232 levels. Possibly using RS-485. A party line has several issues with it, but reduces the cost. It's more suitable for control than pumping data out of the device. s optical isolation required when all the modules are sharing a common power supply? Does this means all the coax connectors need to be isolated. I guess some one better step up and propose a grounding scheme. That's not going to be me. Within such a situation, RF-chokes and transoformers would suffice for isolation. Optical isolation using normal opto-couplers is cheap and space-saving considering that for most uses there just isn't much of data-speed except for a few things. 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] Form factor
Really I just used I2C in my write-up as a place holder. I you say nothing no one ever says a blank paper is wrong and suggests something better. Using a serial interface is nice, but I2C is not the one of my choosings. I'd go for plain serial interface, RS-232 like, but not necesserilly with RS-232 levels. Possibly using RS-485. A party line has several issues with it, but reduces the cost. It's more suitable for control than pumping data out of the device. Additionally, the joy of rs232 (level shifted or not) is that anyone with a serial port, (direct or USB dongle) can debug it and drive the module. Not many have the gear to debug i2c, CAN or SPI. ___ 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] Form Factor and such, Big Picture
I hadn't considered the possibility of using an embedded processor board. That is an interesting possibility. The ability to run linux on it, as well as have DSP and FPGA in hand would certainly up the ante a bit. A 400 mhz DSP and 25Mhz CPU would be more than enough processing power. Just thinking out loud here, I would imagine a main board that such a processor plugs into with locations to plug in input modules, A/D converters, a serial level converter (if there isn't one on the board), and a front 'control' panel. The main board holds not much more than connectors and traces to get signals from those modules to the processor board and/or the A/D boards. Hmmm. Bob On Thu, Dec 23, 2010 at 2:40 AM, Javier Herrero jherr...@hvsistemas.eswrote: El 23/12/2010 05:24, Bob Bownes escribió: ARM or other general purpose CPU is interesting, but at what cost for complexity and/or software development? It would require RAM, IO support, and boot rom at the very least. Not insurmountable, but at a cost to complexity. If you are not planifying to use an embedded operating system like uClinux or embedded linux, no need for external RAM or ROM. There are lot of ARMs from several manufacturers with 256kB flash and 64kB RAM or more for $20, with a nice set of peripherals (USB, UARTs, CAN, even Ethernet without the need of an external phy). Software tools can range from free (GCC + eclipse) to quite expensive (IAR). If you plan to use an embedded operating system, then more RAM, more ROM... We've an embedded processor board that includes a Blackfin, 16 or 32MB flash, 32 or 64MB RAM and a 250,000 gate FPGA, and belive me, it is not so expensive (and if it would be interesting for a project like this, we could try to make a series with special time-nuts price) http://www.hvsistemas.com/en/prod/H8606.html Regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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] Frequency counter recommendation - Basic
The other is what one can buy on the market that is better than the HP 5328? The first step up IMHO is the HP 5335. I have two. AFAIK it is the first of the series that will do TIC. The TIC specification is 100 pico-seconds. For reference the HP 5370A/B TIC spec is 10 pico-seconds. The 5328 will do TIC. It may not be too good at it or have the resolution of the 5335/5370's, but it will do it, both a-b and c,a-b. Compared to the 5328 it has more real estate on the interior and will take the 110811 type of high stability oscillator. The one I have that just has the standard oscillator appears to have the 10811 type crystal in the open but seems very stable. The 5328 will also take a 10881. Plugs right into the motherboard. ___ 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] Frequency counter recommendation - Basic
On 12/23/2010 04:29 PM, Bob Bownes wrote: The other is what one can buy on the market that is better than the HP 5328? The first step up IMHO is the HP 5335. I have two. AFAIK it is the first of the series that will do TIC. The TIC specification is 100 pico-seconds. For reference the HP 5370A/B TIC spec is 10 pico-seconds. The 5328 will do TIC. It may not be too good at it or have the resolution of the 5335/5370's, but it will do it, both a-b and c,a-b. Indeed. If you have the option 040/041/042 boars you go from 100 ns to 10 ns single-shot solution, and in addition when you do averaging noise is added to the reference clock such that higher average resolution is achieved. I would like to have a GPIB-interface for my 5328 so I would have a lower threshold for doing statistical analysis of the properties. Compared to the 5328 it has more real estate on the interior and will take the 110811 type of high stability oscillator. The one I have that just has the standard oscillator appears to have the 10811 type crystal in the open but seems very stable. The 5328 will also take a 10881. Plugs right into the motherboard. You go via a separate board to have a 10811 oscillator. It is not uncommon for 10811s to be delivered with this board since some figure they get more by selling the 5328 separate from the 10811. Ah well. I use that board to drive my lab-bench 10811... need to box it up. 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] Frequency counter recommendation - Basic
The 5328 will also take a 10881. Plugs right into the motherboard. You go via a separate board to have a 10811 oscillator. It is not uncommon for 10811s to be delivered with this board since some figure they get more by selling the 5328 separate from the 10811. Ah well. I use that board to drive my lab-bench 10811... need to box it up. Interesting. Mine have the 10811 plugged straight into the main board. I got the 'daughtercard' with a bare 10811 I bought a while back. Maybe I should go dig it out. Bob ___ 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 on GPS and reference standards
Because the Rockwell-Collins HF80 has sensitivity and selectivity which are avaialble only in Ham gear costing 7000+ definitely not in the 'inexpensive' category, it's transmit signal is also far cleaner than most synthesized HF Rigs. So it makes sense to upgrade the reference oscillator to use this radio with more modern modes such as PSK31 and coherent CW. (Occupied bandwith less than 5 Hz) Scott Sent from my Verizon Wireless BlackBerry -Original Message- From: Joseph Gray jg...@zianet.com Sender: time-nuts-boun...@febo.com Date: Tue, 21 Dec 2010 22:39:38 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Question on GPS and reference standards Not knowing all the particulars and requirements, I may be off base, but instead of spending money trying to frequency stabilize a 20+ year old radio (HF-80), wouldn't it make more sense to spend it on a modern, inexpensive HF rig? You can even get a TCXO option for some rigs. This should be stable enough for most common HF data protocols. I assume that this is for Amateur use? If not, then my comments may not apply. Joe Gray W5JG On Tue, Dec 21, 2010 at 9:48 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: A conjugate regenerative divider will have asinewave output. It only requires a mixer an amplifier or two and a couple of bandpass filters. It will have lower phase noise than all(?) alternative techniques. Bruce Tom Van Baak wrote: A good question for the group... /tvb Hi: I have both a GPS Frequency standard (Trimble Thunder Bolt) which outputs the 10 MHz reference and also the 1 PPS signal. In addition, I have a Collins AEU unit which has a 10 MHz Rubidium reference inside. Both units work well and produce a very accurate reference signal for the units that require a 10 MHz reference. The challenge is that I am looking for a source of a 10:1 frequency divider so I can create a 1 MHz reference for my Rockwell Collins HF-80 system. Can you suggest a source of a high quality frequency divider that outputs a (nearly) sine wave signal? We only need two units - one for production and one for our development lab. The object is to provide a very accurate source of 1 MHz and 10 MHz to the various radio systems used in our disaster and humanitarian relief radio network. When you send data, you need to be exactly on frequency. Any help would be great. Just need to be pointed in the right direction. While we could try to design something to meet this objective, I am sure that someone has already done this. Thank you. Kevin ___ 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. ___ 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] Form Factor and such, Big Picture
El 23/12/2010 16:11, Bob Bownes escribió: I hadn't considered the possibility of using an embedded processor board. That is an interesting possibility. The ability to run linux on it, as well as have DSP and FPGA in hand would certainly up the ante a bit. A 400 mhz DSP and 25Mhz CPU would be more than enough processing power. It is only a 400MHz DSP/RISC (no additional processor). The Blackfin is a DSP with good general purpose processor characteristics. The 400MHz clock is internally derived from a 25MHz crystal. Just thinking out loud here, I would imagine a main board that such a processor plugs into with locations to plug in input modules, A/D converters, a serial level converter (if there isn't one on the board), and a front 'control' panel. The main board holds not much more than connectors and traces to get signals from those modules to the processor board and/or the A/D boards. The front control panel could be simply a touch-screen. I've used this board with a 7 800x480 TFTs and with 2.83 320x240 OLED displays, both with TPs. Best regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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] Form Factor and such, Big Picture
Bob, That is what I'm thinking also but when you say the main board has nothing on it but a few connectors then why have a main board? All the functions of the main board can be placed in a plug-in that is easy to change as technology moves. Rather then a main board you have just a cable, maybe a ribbon cable for control and status and coax for any analog signals. The problem with a backplan is that they are physically very hard to build. You need a card cadge of some kind. I think we want this to be build-able by amateurs at home. If you use a flexible backplane (aka, cable) then the mechanical design is very easy, you could screw the cards down to a bread board or mount them ina 1U rack chasis, put them in a diacast Hammond box or whatever. But a ridgid backplan would dictate only one mechanical design The soft backplane can evolve. Right now people want a counter and that application does not need any high speed data on the bus. Even 100Kbps is overkill. When you start taking about spectrum analyzers then you need high speed data interconnects and we can add that when the time comes. You can't do that if the bus in a PCB with connectors, you are stuck with what you have so you end up running card to card cable jumpers. May as well just start with the jumpers from the beginning. There are some really great embedded processors out. The problem is software. If you pick some exotic processor then you will be the only one to write software for it. To avoid that I'd pick one that most people already know. The bottleneck in these projects is always software and you should design hardware to minimize that problem even if it adds $20 to the cost. Moving the processor into a plug in module seems pointless to some people who already own a PC but if you are working with high speed data then you find interfacing that data to a desktop PC is not easy so if simply place the PC inside your project then Poof the interface problem is gone. The HPSDR project is a good example. They had to use a card with a FPGA on it to pre-process data to the point where it would fit down the bandwidth of a USB cable. Cost for that is a couple hundred dollars and a year of engineering but, had they simply placed the computer inside the box there would be no need for high speed box-to-PC link. Years ago this would have been expensive but today powerful CPU that can run Linux or even Windows costs very little That said the basic counter project should NOT need such a powerful CPU. A little 8-bit uP with 14 pins should be enough. On Thu, Dec 23, 2010 at 7:11 AM, Bob Bownes bow...@gmail.com wrote: Just thinking out loud here, I would imagine a main board that such a processor plugs into with locations to plug in input modules, A/D converters, a serial level converter (if there isn't one on the board), and a front 'control' panel. The main board holds not much more than connectors and traces to get signals from those modules to the processor board and/or the A/D boards. Hmmm. Bob -- = 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.
Re: [time-nuts] Form Factor and such, Big Picture
El 23/12/2010 19:08, Chris Albertson escribió: There are some really great embedded processors out. The problem is software. If you pick some exotic processor then you will be the only one to write software for it. To avoid that I'd pick one that most people already know. The bottleneck in these projects is always software and you should design hardware to minimize that problem even if it adds $20 to the cost. No need to pick an exotic one, and software is not a great bottleneck. If you write bare-metal applications, you can done all in C (I've done a lot with ARM and never wrote a line in assembler for it). Also, lots of free tools (for ARM, for AVR, etc.). If you use a processor running an embedded OS like uClinux, you have not to bother to write the low level software (the one that interacts directly with the h/w) except if you need to write a driver for some peripheral, and you get full networking support, solid state disk support and lots more. But you need more ROM and more RAM (quite a bit more). That said the basic counter project should NOT need such a powerful CPU. A little 8-bit uP with 14 pins should be enough. When you have a decent ARM for $10, and a great ARM for $20 with USB, 100Mbps Ethernet including phy, CAN, I2C, SPI, SSI, lots of timers, etc... and a 32-bit core running at 50 or 80MHz, you tend to forget anything like an 8-bit PIC (I'm talking about one-off projects or small series - for large series, hardware cost is ever more important - and PICs are not unexpensive except for the very small ones, either. In the first cases, only one hour in software development that you can save using a more powerful processor rentabilizes it) And for time nuts, the LM3S9B96 even has IEEE-1588 support ;) Development kits for the LM3S9B9x are in the order of $100 and looks very nice even for including 'as is' in a one-off project (not in a series - long term delivery is never guaranteed). Check Mouser (for example) for them. Regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC
In my various tinkering it always seems that I have to recreate a software clock that accounts for the behavior thats advanced by 1 second. Have done that on 2-3 projects the most recent being the GOES DC468 simulator. Regards On Thu, Dec 23, 2010 at 5:49 AM, Kiwi Geoff geof...@gmail.com wrote: Hal Murray wrote: I assume it was working correctly previously. If not... At least one GPS receiver I've used is off by a second. There is an ambiguity as to whether the time applies to the previous or next PPS. You were correct Hal, the problem with the new firmware for the 18x, is the time relationship between the 1PPS transition and the serial data. My application required the RMC and GGA sentence at 4800 BAUD. So I measured the start and end times of the serial data (with respect the 1PPS). Using version 3.00 firmware on the Garmin 18x, the NMEA data starts 450 ms after the 1PPS transition, and finishes at 740 ms. However using the latest firmware version (3.50) for the 18x, the NMEA data starts at 750 ms and finishes 39 ms into the following second. That is why my software was loading the wrong time. These start and end times of the NMEA serial data change quite a bit as the workload of the GPS changes. There is no mention in all the update notes, that Garmin have changed the timing of the NMEA data with respect the 1PPS transition. Running the same test with my GPS 18, the NMEA starts about 50 ms and finishes 350 ms after the 1PPS transition - nice and reliable! I think the reason my 18x started (in the last few days) to show the wrong time, is that the trees around my house are at the peak of growing leaves (Summer in the Southern Hemisphere) and so this would have caused the GPS to work harder, and so must have delayed the NMEA data enough (with version 3.50) to give the wrong time on the serial data. So the moral of the story, don't expect that a device will be better if you upgrade to the latest version of software. Thanks Hal for your kind pointer - I now understand what is going on, and not to be so excited about new firmware updates. Kiwi Geoff (Christchurch, New Zealand). ___ 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] Question on GPS and reference standards
Oh I actually understand the radio. I was looking at the wenzel and will guess that would be quite expensive. This from a flea market junky. Regards On Thu, Dec 23, 2010 at 12:24 PM, scmcgr...@gmail.com wrote: Because the Rockwell-Collins HF80 has sensitivity and selectivity which are avaialble only in Ham gear costing 7000+ definitely not in the 'inexpensive' category, it's transmit signal is also far cleaner than most synthesized HF Rigs. So it makes sense to upgrade the reference oscillator to use this radio with more modern modes such as PSK31 and coherent CW. (Occupied bandwith less than 5 Hz) Scott Sent from my Verizon Wireless BlackBerry -Original Message- From: Joseph Gray jg...@zianet.com Sender: time-nuts-boun...@febo.com Date: Tue, 21 Dec 2010 22:39:38 To: Discussion of precise time and frequency measurement time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Question on GPS and reference standards Not knowing all the particulars and requirements, I may be off base, but instead of spending money trying to frequency stabilize a 20+ year old radio (HF-80), wouldn't it make more sense to spend it on a modern, inexpensive HF rig? You can even get a TCXO option for some rigs. This should be stable enough for most common HF data protocols. I assume that this is for Amateur use? If not, then my comments may not apply. Joe Gray W5JG On Tue, Dec 21, 2010 at 9:48 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: A conjugate regenerative divider will have asinewave output. It only requires a mixer an amplifier or two and a couple of bandpass filters. It will have lower phase noise than all(?) alternative techniques. Bruce Tom Van Baak wrote: A good question for the group... /tvb Hi: I have both a GPS Frequency standard (Trimble Thunder Bolt) which outputs the 10 MHz reference and also the 1 PPS signal. In addition, I have a Collins AEU unit which has a 10 MHz Rubidium reference inside. Both units work well and produce a very accurate reference signal for the units that require a 10 MHz reference. The challenge is that I am looking for a source of a 10:1 frequency divider so I can create a 1 MHz reference for my Rockwell Collins HF-80 system. Can you suggest a source of a high quality frequency divider that outputs a (nearly) sine wave signal? We only need two units - one for production and one for our development lab. The object is to provide a very accurate source of 1 MHz and 10 MHz to the various radio systems used in our disaster and humanitarian relief radio network. When you send data, you need to be exactly on frequency. Any help would be great. Just need to be pointed in the right direction. While we could try to design something to meet this objective, I am sure that someone has already done this. Thank you. Kevin ___ 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. ___ 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] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC
I have a similar issue with TAC32 receiving NEMA data from a Rockwell Jupiter based GPS. If any software developers are reading this adding some form of UTC off set functionality to account for this behaviour would be nice (: - Original Message From: paul swed paulsw...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thu, December 23, 2010 11:43:45 AM Subject: Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC In my various tinkering it always seems that I have to recreate a software clock that accounts for the behavior thats advanced by 1 second. Have done that on 2-3 projects the most recent being the GOES DC468 simulator. Regards ___ 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] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC
Is tac32 free to amateurs? On Thu, Dec 23, 2010 at 3:05 PM, Mark Spencer mspencer12...@yahoo.cawrote: I have a similar issue with TAC32 receiving NEMA data from a Rockwell Jupiter based GPS. If any software developers are reading this adding some form of UTC off set functionality to account for this behaviour would be nice (: - Original Message From: paul swed paulsw...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thu, December 23, 2010 11:43:45 AM Subject: Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC In my various tinkering it always seems that I have to recreate a software clock that accounts for the behavior thats advanced by 1 second. Have done that on 2-3 projects the most recent being the GOES DC468 simulator. Regards ___ 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] Form Factor and such, Big Picture
Gosh, Javier, I went to your website, and found one of my favorite peeves: it says low cost without a hint of the price. I've found that this combination usually means way out of my price class or, if you have to ask, it's too high, or low cost for a big company with a research budget. Sorry, just my prejudices showing. Don Javier Herrero El 23/12/2010 05:24, Bob Bownes escribió: ARM or other general purpose CPU is interesting, but at what cost for complexity and/or software development? It would require RAM, IO support, and boot rom at the very least. Not insurmountable, but at a cost to complexity. If you are not planifying to use an embedded operating system like uClinux or embedded linux, no need for external RAM or ROM. There are lot of ARMs from several manufacturers with 256kB flash and 64kB RAM or more for $20, with a nice set of peripherals (USB, UARTs, CAN, even Ethernet without the need of an external phy). Software tools can range from free (GCC + eclipse) to quite expensive (IAR). If you plan to use an embedded operating system, then more RAM, more ROM... We've an embedded processor board that includes a Blackfin, 16 or 32MB flash, 32 or 64MB RAM and a 250,000 gate FPGA, and belive me, it is not so expensive (and if it would be interesting for a project like this, we could try to make a series with special time-nuts price) http://www.hvsistemas.com/en/prod/H8606.html Regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ 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 on GPS and reference standards
I just looked up what it would take to build a 10:1 conjugate regenerative divider. This is not easy nor cheap. The conjugate number turn out to be f/10 and 9f/10. 9f/10 is close to f. Question for the group? What phase noise should be expected if a conventional PPL was used? I can't believe that a PLL derived 1Mhz reference is not good enough for a 30Mhz HF transmitter. Maybe different answer if the transmitter were microwave Not arguing, this is a real question. I'm wondering how good a simple and convention PLL is. My problem is that I do the calculations and it's not real world and I get perfect result. Just wondering how and what cause PPL to be not perfect and by how much. On Thu, Dec 23, 2010 at 11:45 AM, paul swed paulsw...@gmail.com wrote: Oh I actually understand the radio. I was looking at the wenzel and will guess that would be quite expensive. This from a flea market junky. Regards On Thu, Dec 23, 2010 at 12:24 PM, scmcgr...@gmail.com wrote: Because the Rockwell-Collins HF80 has sensitivity and selectivity which are avaialble only in Ham gear costing 7000+ definitely not in the 'inexpensive' category, it's transmit signal is also far cleaner than most synthesized HF Rigs. So it makes sense to upgrade the reference oscillator to use this radio with more modern modes such as PSK31 and coherent CW. (Occupied bandwith less than 5 Hz) Scott Sent from my Verizon Wireless BlackBerry -Original Message- From: Joseph Gray jg...@zianet.com Sender: time-nuts-boun...@febo.com Date: Tue, 21 Dec 2010 22:39:38 To: Discussion of precise time and frequency measurement time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Question on GPS and reference standards Not knowing all the particulars and requirements, I may be off base, but instead of spending money trying to frequency stabilize a 20+ year old radio (HF-80), wouldn't it make more sense to spend it on a modern, inexpensive HF rig? You can even get a TCXO option for some rigs. This should be stable enough for most common HF data protocols. I assume that this is for Amateur use? If not, then my comments may not apply. Joe Gray W5JG On Tue, Dec 21, 2010 at 9:48 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: A conjugate regenerative divider will have asinewave output. It only requires a mixer an amplifier or two and a couple of bandpass filters. It will have lower phase noise than all(?) alternative techniques. Bruce Tom Van Baak wrote: A good question for the group... /tvb Hi: I have both a GPS Frequency standard (Trimble Thunder Bolt) which outputs the 10 MHz reference and also the 1 PPS signal. In addition, I have a Collins AEU unit which has a 10 MHz Rubidium reference inside. Both units work well and produce a very accurate reference signal for the units that require a 10 MHz reference. The challenge is that I am looking for a source of a 10:1 frequency divider so I can create a 1 MHz reference for my Rockwell Collins HF-80 system. Can you suggest a source of a high quality frequency divider that outputs a (nearly) sine wave signal? We only need two units - one for production and one for our development lab. The object is to provide a very accurate source of 1 MHz and 10 MHz to the various radio systems used in our disaster and humanitarian relief radio network. When you send data, you need to be exactly on frequency. Any help would be great. Just need to be pointed in the right direction. While we could try to design something to meet this objective, I am sure that someone has already done this. Thank you. Kevin ___ 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. ___ 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. -- = Chris Albertson Redondo Beach, California ___ time-nuts mailing list
[time-nuts] GOES Truetime DC468 simulator update
To those that are interested. Just about done. A word document descriptions created and the schematic in Express PC. Doing proof reading now. Regards Paul. ___ 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] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC
I don't believe so. I paid for my copy. - Original Message From: paul swed paulsw...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thu, December 23, 2010 12:07:07 PM Subject: Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC Is tac32 free to amateurs? On Thu, Dec 23, 2010 at 3:05 PM, Mark Spencer mspencer12...@yahoo.cawrote: I have a similar issue with TAC32 receiving NEMA data from a Rockwell Jupiter based GPS. If any software developers are reading this adding some form of UTC off set functionality to account for this behaviour would be nice (: - Original Message From: paul swed paulsw...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thu, December 23, 2010 11:43:45 AM Subject: Re: [time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC In my various tinkering it always seems that I have to recreate a software clock that accounts for the behavior thats advanced by 1 second. Have done that on 2-3 projects the most recent being the GOES DC468 simulator. Regards ___ 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] GOES Truetime DC468 simulator update
Great news paul. Had K7MLR Sent from my Samsung Captivate(tm) on ATT paul swed paulsw...@gmail.com wrote: To those that are interested. Just about done. A word document descriptions created and the schematic in Express PC. Doing proof reading now. Regards Paul. ___ 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] GOES Truetime DC468 simulator readyWill upload to Diddiers site. Two others offered to host??? Happy holidays
Hello to the group have proofed and double checked info. Ready to post. Diddier volunteered to host with 2 other gentleman. I can't find that email. If interested will forward for posting. Its about 3 MB with pictures. Regards Paul WB8TSL ___ 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] Truetime DC468 GOES simulator in Diddiers upload folder for posting only 485 KB actually
Converted word to pdf and zipped crunched it to 485 KB. Pretty good. Enjoy. Paul WB8TSL ___ 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 on GPS and reference standards
On 12/23/2010 09:52 PM, Chris Albertson wrote: I just looked up what it would take to build a 10:1 conjugate regenerative divider. This is not easy nor cheap. The conjugate number turn out to be f/10 and 9f/10. 9f/10 is close to f. Filters for 1 MHz and 9 MHz with sufficient Q-value is cheap an straight-forward to design. The amplifier does not have to be spectacular. The part-count should be fairly low to meet your needs. Question for the group? What phase noise should be expected if a conventional PPL was used? I can't believe that a PLL derived 1Mhz reference is not good enough for a 30Mhz HF transmitter. Maybe different answer if the transmitter were microwave Not arguing, this is a real question. I'm wondering how good a simple and convention PLL is. My problem is that I do the calculations and it's not real world and I get perfect result. Just wondering how and what cause PPL to be not perfect and by how much. Look at the Wentzel dividers, it is essentially a divider with related signal treatment. You rarely use PLLs for division but for multiplications, which is not the same as saying you can't. It would just be overkill most of the times. A PLL without a divider but using a S/H phase-detector would be possible thought. 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] Form Factor and such, Big Picture
Simply ask ;) Seriously, I think that this kind of things are not too much money, like for example the ADSP-BF537 Stamp from Analog Devices http://search.digikey.com/scripts/DkSearch/dksus.dll?Detailname=ADZS-BF537-STAMP-ND We are not building this one in large quantities, but we've used it as an starting point for several projects (see the space projects section on my web... all of them have one or more inside ;) ) Do you think that the STAMP from ADI is too expensive? :) Regards, Javier El 23/12/2010 21:52, Don Latham escribió: Gosh, Javier, I went to your website, and found one of my favorite peeves: it says low cost without a hint of the price. I've found that this combination usually means way out of my price class or, if you have to ask, it's too high, or low cost for a big company with a research budget. Sorry, just my prejudices showing. Don Javier Herrero El 23/12/2010 05:24, Bob Bownes escribió: ARM or other general purpose CPU is interesting, but at what cost for complexity and/or software development? It would require RAM, IO support, and boot rom at the very least. Not insurmountable, but at a cost to complexity. If you are not planifying to use an embedded operating system like uClinux or embedded linux, no need for external RAM or ROM. There are lot of ARMs from several manufacturers with 256kB flash and 64kB RAM or more for$20, with a nice set of peripherals (USB, UARTs, CAN, even Ethernet without the need of an external phy). Software tools can range from free (GCC + eclipse) to quite expensive (IAR). If you plan to use an embedded operating system, then more RAM, more ROM... We've an embedded processor board that includes a Blackfin, 16 or 32MB flash, 32 or 64MB RAM and a 250,000 gate FPGA, and belive me, it is not so expensive (and if it would be interesting for a project like this, we could try to make a series with special time-nuts price) http://www.hvsistemas.com/en/prod/H8606.html Regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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 on GPS and reference standards
Hi Chris, From: Chris Albertson albertson.ch...@gmail.com What phase noise should be expected if a conventional PPL was used? Phase-locked Loop Circuit Design H. Wolaver: http://www.on4jln.be/pll_wolaver.pdf Bye, Jean-Louis ___ 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] Form Factor and such, Big Picture
I think the ADSP-stamp is about $100 overpriced at least. there are boards available with more capability for less. There is an old saying that noone was ever fired for buying IBM, maybe that's why AD charges what they do. meantime, microchip is laughing all the way to the bank... That said, your board is about right if that is the price for the development system. I do appreciate it was started for your own use. Certainly the fpga and blackfin will do the job along with some good front end electronics! Merry Christmas to you and yours. Don Javier Herrero Simply ask ;) Seriously, I think that this kind of things are not too much money, like for example the ADSP-BF537 Stamp from Analog Devices http://search.digikey.com/scripts/DkSearch/dksus.dll?Detailname=ADZS-BF537-STAMP-ND We are not building this one in large quantities, but we've used it as an starting point for several projects (see the space projects section on my web... all of them have one or more inside ;) ) Do you think that the STAMP from ADI is too expensive? :) Regards, Javier El 23/12/2010 21:52, Don Latham escribió: Gosh, Javier, I went to your website, and found one of my favorite peeves: it says low cost without a hint of the price. I've found that this combination usually means way out of my price class or, if you have to ask, it's too high, or low cost for a big company with a research budget. Sorry, just my prejudices showing. Don Javier Herrero El 23/12/2010 05:24, Bob Bownes escribió: ARM or other general purpose CPU is interesting, but at what cost for complexity and/or software development? It would require RAM, IO support, and boot rom at the very least. Not insurmountable, but at a cost to complexity. If you are not planifying to use an embedded operating system like uClinux or embedded linux, no need for external RAM or ROM. There are lot of ARMs from several manufacturers with 256kB flash and 64kB RAM or more for$20, with a nice set of peripherals (USB, UARTs, CAN, even Ethernet without the need of an external phy). Software tools can range from free (GCC + eclipse) to quite expensive (IAR). If you plan to use an embedded operating system, then more RAM, more ROM... We've an embedded processor board that includes a Blackfin, 16 or 32MB flash, 32 or 64MB RAM and a 250,000 gate FPGA, and belive me, it is not so expensive (and if it would be interesting for a project like this, we could try to make a series with special time-nuts price) http://www.hvsistemas.com/en/prod/H8606.html Regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ 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 on GPS and reference standards
Dear Jean-Louis, On 12/24/2010 01:22 AM, Jean-Louis Noel wrote: Hi Chris, From: Chris Albertson albertson.ch...@gmail.com What phase noise should be expected if a conventional PPL was used? Phase-locked Loop Circuit Design H. Wolaver: http://www.on4jln.be/pll_wolaver.pdf The long does not open as it should. Infact, when poking around your homepage it seems like several links has the same effect... not found. The Wolaver book is recommended reading and I have it, but it would be handy to have as PDF as well. Merry Christmas, 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] Form Factor and such, Big Picture
I suppose that it all depends on the production quantity :) Well, the ADSP-BF537 EZKIT is quite more expensive and does not provides too muchs not included in the STAM... and if you like to see thing really expensive, this is an example: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detailname=544-2605-ND Merry Christmas and happy new year to all of you! Best regards, Javier El 24/12/2010 01:35, Don Latham escribió: I think the ADSP-stamp is about $100 overpriced at least. there are boards available with more capability for less. There is an old saying that noone was ever fired for buying IBM, maybe that's why AD charges what they do. meantime, microchip is laughing all the way to the bank... That said, your board is about right if that is the price for the development system. I do appreciate it was started for your own use. Certainly the fpga and blackfin will do the job along with some good front end electronics! Merry Christmas to you and yours. Don Javier Herrero Simply ask ;) Seriously, I think that this kind of things are not too much money, like for example the ADSP-BF537 Stamp from Analog Devices http://search.digikey.com/scripts/DkSearch/dksus.dll?Detailname=ADZS-BF537-STAMP-ND We are not building this one in large quantities, but we've used it as an starting point for several projects (see the space projects section on my web... all of them have one or more inside ;) ) Do you think that the STAMP from ADI is too expensive? :) Regards, Javier El 23/12/2010 21:52, Don Latham escribió: Gosh, Javier, I went to your website, and found one of my favorite peeves: it says low cost without a hint of the price. I've found that this combination usually means way out of my price class or, if you have to ask, it's too high, or low cost for a big company with a research budget. Sorry, just my prejudices showing. Don Javier Herrero El 23/12/2010 05:24, Bob Bownes escribió: ARM or other general purpose CPU is interesting, but at what cost for complexity and/or software development? It would require RAM, IO support, and boot rom at the very least. Not insurmountable, but at a cost to complexity. If you are not planifying to use an embedded operating system like uClinux or embedded linux, no need for external RAM or ROM. There are lot of ARMs from several manufacturers with 256kB flash and 64kB RAM or more for$20, with a nice set of peripherals (USB, UARTs, CAN, even Ethernet without the need of an external phy). Software tools can range from free (GCC + eclipse) to quite expensive (IAR). If you plan to use an embedded operating system, then more RAM, more ROM... We've an embedded processor board that includes a Blackfin, 16 or 32MB flash, 32 or 64MB RAM and a 250,000 gate FPGA, and belive me, it is not so expensive (and if it would be interesting for a project like this, we could try to make a series with special time-nuts price) http://www.hvsistemas.com/en/prod/H8606.html Regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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] Truetime DC468 GOES simulator in Diddiers upload folder for posting only 485 KB actually
curious where it is posted. you can email what you have to me Paul if that is easier. thanks JIm On 12/23/2010 3:28 PM, paul swed wrote: Converted word to pdf and zipped crunched it to 485 KB. Pretty good. Enjoy. Paul WB8TSL ___ 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] Truetime DC468 GOES simulator in Diddiers upload folder for posting only 485 KB actually
Try: www.n4iqt.com/DC468simul Stanley - Original Message From: jim s j...@jwsss.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thu, December 23, 2010 8:53:56 PM Subject: Re: [time-nuts] Truetime DC468 GOES simulator in Diddiers upload folder for posting only 485 KB actually curious where it is posted. you can email what you have to me Paul if that is easier. thanks JIm On 12/23/2010 3:28 PM, paul swed wrote: Converted word to pdf and zipped crunched it to 485 KB. Pretty good. Enjoy. Paul WB8TSL ___ 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] Form Factor and such, Big Picture
yikes! only for us government contractors. Don Javier Herrero I suppose that it all depends on the production quantity :) Well, the ADSP-BF537 EZKIT is quite more expensive and does not provides too muchs not included in the STAM... and if you like to see thing really expensive, this is an example: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detailname=544-2605-ND Merry Christmas and happy new year to all of you! Best regards, Javier El 24/12/2010 01:35, Don Latham escribió: I think the ADSP-stamp is about $100 overpriced at least. there are boards available with more capability for less. There is an old saying that noone was ever fired for buying IBM, maybe that's why AD charges what they do. meantime, microchip is laughing all the way to the bank... That said, your board is about right if that is the price for the development system. I do appreciate it was started for your own use. Certainly the fpga and blackfin will do the job along with some good front end electronics! Merry Christmas to you and yours. Don Javier Herrero Simply ask ;) Seriously, I think that this kind of things are not too much money, like for example the ADSP-BF537 Stamp from Analog Devices http://search.digikey.com/scripts/DkSearch/dksus.dll?Detailname=ADZS-BF537-STAMP-ND We are not building this one in large quantities, but we've used it as an starting point for several projects (see the space projects section on my web... all of them have one or more inside ;) ) Do you think that the STAMP from ADI is too expensive? :) Regards, Javier El 23/12/2010 21:52, Don Latham escribió: Gosh, Javier, I went to your website, and found one of my favorite peeves: it says low cost without a hint of the price. I've found that this combination usually means way out of my price class or, if you have to ask, it's too high, or low cost for a big company with a research budget. Sorry, just my prejudices showing. Don Javier Herrero El 23/12/2010 05:24, Bob Bownes escribió: ARM or other general purpose CPU is interesting, but at what cost for complexity and/or software development? It would require RAM, IO support, and boot rom at the very least. Not insurmountable, but at a cost to complexity. If you are not planifying to use an embedded operating system like uClinux or embedded linux, no need for external RAM or ROM. There are lot of ARMs from several manufacturers with 256kB flash and 64kB RAM or more for$20, with a nice set of peripherals (USB, UARTs, CAN, even Ethernet without the need of an external phy). Software tools can range from free (GCC + eclipse) to quite expensive (IAR). If you plan to use an embedded operating system, then more RAM, more ROM... We've an embedded processor board that includes a Blackfin, 16 or 32MB flash, 32 or 64MB RAM and a 250,000 gate FPGA, and belive me, it is not so expensive (and if it would be interesting for a project like this, we could try to make a series with special time-nuts price) http://www.hvsistemas.com/en/prod/H8606.html Regards, Javier -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Javier HerreroEMAIL: jherr...@hvsistemas.com Chief Technology Officer HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17 FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ___ 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. -- Neither the voice of authority
[time-nuts] 10544 TCXO used in H/P 5245L counter
I`m looking for a pdf of the schematic of the motherboard that the 10544 frequency reference plugs onto in the H/P 5245L counter. This is the one that has a 723N, and a 7490N to produce a 100KHz reference. Something is amiss with this board. Thankyou.Don. ___ 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.
