[time-nuts] Metastability in a 100 MHz TIC
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In my Brooks Shera style LPRO rubidium controller I am using the same HC4046 input conditioner and divide down counter on the oscillator and HC4046 phase detector interrupting the PIC as used in the original design. The phase detector output feeds the count enable input of a pair of Fairchild 74F163A synchronous binary counters clocked with a 100 MHz XO to increase the TIC sample resolution to 10ns. The counters are read and cleared every second and accumulated in software to minimize glitches from multiple gating into the counter. A 23-bit DAC and LM199 reference are used to improve the EFC resolution, applying 0-5v directly to the LPRO EFC input to minimize noise pickup and maximize loop gain. A 16F688 PIC monitors the GPS messages and accumulates sawtooth corrections until read at the update time over a high-speed 200kbps 3-wire handshaking serial interface by the 16F873A main controller. The handshaking interface allows the 16F688 to transmit the accumulated sawtooth correction for the current sample to the controller and reset its accumulator between UART reads to prevent data loss and before the TRAIM message for the next sample arrives to insure the predictions match the samples. A 4x larger setpoint and 1/4 the filter gain of the original design are used to adjust for the larger counts returned with a 100 MHz TIC. This keeps the controller gain and limiting threshold approximately the same as the original design to prevent excessive limiting of the input data into the filter at high phase offsets and maintains good initial lock performance. Since the 1-second stability of a rubidium oscillator is relatively poor, and the 100-second stability is much better, the loop update time was increased in the rubidium controller from 30 to 120 seconds. The longer update time results in 1/4 the number of updates to the EFC for improved stability, and 4x more samples accumulated per update to provide a better indication of true rubidium oscillator stability. Without increasing the controller gain and using a TIC with 4x the resolution of the original design over a sample period 4x longer than the original design the loop gain is 16x greater than the original design for proper loop damping with the rubidium oscillator. I originally assumed the 4x longer filter times that result with the longer update time would be an advantage with a rubidium oscillator. Testing revealed that proper correction for daily temperature variations prevented using filter modes with settle times longer than about half a day, or what the Mode 7 (Tau = 8K sec) IIR filter in the original design provides. The longer update time made the top two filter modes settle in about 1 and 2 days and were not fast enough in correcting for temperature variations to maintain optimum long-term stability. Adjusting the mode scaling to 1/4 the original value to compensate for the longer update time restored the original range of IIR filter times. With the discussions here on metastable states in TIC counters, I am asking the experts on the list for their opinion if the performance of this design would improve by adding a shift register synchronizer between the phase detector output and the count enable input of the 74F163A TIC to reduce metastable states. The 74F series has the best reliability figures from metastable effects of all the TTL logic families according to the data I have read. Each D F/F counter cell in the 74F163A has the clock applied directly to the F/F, so no clock gating occurs. Instead the input data is gated by count enable signals for each cell and either the cell output is sent to the D input if the count enable is low, or the previous cell output is gated into the D input on carry if the count enable is high with D latched into all F/Fs on each clock rising edge. While I see the need for a synchronizing shift register in a gated clock design like the original Shera controller, is it necessary for best performance in a GPSDRO application with a 74F163A 100 MHz TIC? ___ 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] manual request: Austron 2201A
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Jamie, I believe I have one in the store. Will take a look tonight when I get back. May also be some of the module manuals. What plug-ins does it have? Rob Kimberley -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 18 July 2007 23:30 To: time-nuts@febo.com Subject: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Looking for a manual for an Austron 2201A GPS receiver. Thanks! --Jamie Fedora Core 4 Linux Ready for the edge of your seat? Check out tonight's top picks on Yahoo! TV. http://tv.yahoo.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.
[time-nuts] Fury PR in GPS World..
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] http://uc.gpsworld.com/gpsuc/article/articleDetail.jsp?id=442353 Rob Kimberley ___ 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] Fury PR in GPS World... Part 2
Forgot to mention the low noise floor in the article!! Rob Kimberley ___ 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] Austron 1120 questions
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Bjorn, Another list member (Rob Kimberley) sent me a copy of a PDF earlier this year, but it is for the later, 1986 model, which had an octal tube base. It is just over 2 megabytes, so with Rob's blessing I've put it on my website - http://www.barney-wol.net/private/Austron1120.pdf - in case it is of any use. Regards, Peter Vince (G8ZZR, London, England) ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Just got my hands on a 1981 vintage Austron 1120. Nicely marked with serial number, 10MHz output freq, 15 VDC input. There are coarse and fine freq tuning. But the four solder pins are just marked E1, E2, E3, E4. With the E4 being the closest to the freq adjustments. Anyone with pinout information on this oscillator? Performance data? thanks, Bj=F6rn ___ 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] Iforomation request XR5 M
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi all, I've had to admit defeat on web searches for connection information on this receiver. It's a NavStar XR5M. These were a popular GPS in a diecast box with screw-lock DIN connectors on the front. Later ones were marked 12 Channel (mine is not), they were sold under several different makers names. Does anyone have any connection information, or even better a manual? Many thanks, Robert G8RPI. Genetix Limited - Queensway, New Milton, Hampshire, BH25 5NN Registered in England No. 2660050 www.genetix.com Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600. The unauthorised use, disclosure, copying or alteration of this message is strictly forbidden. This mail and any attachments have been scanned for viruses prior to leaving Genetix network. Genetix will not be liable for direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from alteration of the contents of this message by a third party. ___ 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] Oncore VP problem
In a message dated 19/07/2007 02:44:42 GMT Daylight Time, [EMAIL PROTECTED] writes: My suggestion is that you pick up a free evaluation copy of Rick Hambly's TAC32 software at http://cnssys.com/cnsclock/Tac32Software.html . TAC32 knows all the quirks options that ever existed in a Motorola receiver, going all the way back to the Rev.3 PVT6. Then if you find it useful, a legal copy can be purchased from Rick, or at members discount from TAPR (http://www.tapr.org/gps_tac32.html). --- Hi Tom Many thanks for the suggestion. You may have seen my subsequent post in which I commented that I had tried TAC32 without solving my problem, only to find the kit was working ok but with an incorrectly labelled connector. TAC32 does look useful though so I'll check it over more thoroughly later. One interesting side effect.. Some time after shutting down TAC32 last night, but with the Oncore still connected to the serial port and outputting data, my PS2 connected mouse started misbehaving, with the pointer jumping all over the place then settling down for a while before repeating the performance. It didn't occur to me at first that the incoming serial data might have anything to do with it until it started again this morning and I eventually stopped it by disconnecting the serial lead from the receiver. Whilst I can't say for sure that running TAC32 was what caused it, it's not something I've ever seen in the past nor previously this past few days after running WinOncore. I'll check later to see if the port shut down properly and also take a look at the Oncore message stream, perhaps TAC32 may have changed something there as part of its auto setup routine? regards Nigel GM8PZR ___ 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] Austron 1120 ...thanks
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Peter thanks for that I have had an 1120-2 1MHz unit sulking in my might be useful sometime box for a couple of years. Cheers de Alan G3NYK (Ipswich) - Original Message - From: Peter Vince [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: 19 July 2007 08:55 Subject: Re: [time-nuts] Austron 1120 questions Hi Bjorn, Another list member (Rob Kimberley) sent me a copy of a PDF earlier this year, but it is for the later, 1986 model, which had an octal tube base. It is just over 2 megabytes, so with Rob's blessing I've put it on my website - http://www.barney-wol.net/private/Austron1120.pdf - in case it is of any use. Regards, Peter Vince (G8ZZR, London, England) 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] Oncore VP problem
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In the TAC32 documentation, you will read about Mouse data and GPS data ! Theres a command line switch to run that should resolve it. Brian N4FMN [EMAIL PROTECTED] wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] X-Spam: [F=0.0149253731; S=0.010(2007071801); MH=0.500(2007071904); R=0.600(s0/n0)] X-MAIL-FROM: [EMAIL PROTECTED] X-SOURCE-IP: [(unknown)] X-MxL-Spam-Verdict: No In a message dated 19/07/2007 02:44:42 GMT Daylight Time, [EMAIL PROTECTED] writes: My suggestion is that you pick up a free evaluation copy of Rick Hambly's TAC32 software at http://cnssys.com/cnsclock/Tac32Software.html . TAC32 knows all the quirks options that ever existed in a Motorola receiver, going all the way back to the Rev.3 PVT6. Then if you find it useful, a legal copy can be purchased from Rick, or at members discount from TAPR (http://www.tapr.org/gps_tac32.html). --- Hi Tom Many thanks for the suggestion. You may have seen my subsequent post in which I commented that I had tried TAC32 without solving my problem, only to find the kit was working ok but with an incorrectly labelled connector. TAC32 does look useful though so I'll check it over more thoroughly later. One interesting side effect.. Some time after shutting down TAC32 last night, but with the Oncore still connected to the serial port and outputting data, my PS2 connected mouse started misbehaving, with the pointer jumping all over the place then settling down for a while before repeating the performance. It didn't occur to me at first that the incoming serial data might have anything to do with it until it started again this morning and I eventually stopped it by disconnecting the serial lead from the receiver. Whilst I can't say for sure that running TAC32 was what caused it, it's not something I've ever seen in the past nor previously this past few days after running WinOncore. I'll check later to see if the port shut down properly and also take a look at the Oncore message stream, perhaps TAC32 may have changed something there as part of its auto setup routine? regards Nigel GM8PZR ___ 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] Oncore VP problem
In the TAC32 documentation, you will read about Mouse data and GPS data ! Theres a command line switch to run that should resolve it (NoSerialMice or something to that efect) Brian N4FMN [EMAIL PROTECTED] wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] X-Spam: [F=0.0149253731; S=0.010(2007071801); MH=0.500(2007071904); R=0.600(s0/n0)] X-MAIL-FROM: [EMAIL PROTECTED] X-SOURCE-IP: [(unknown)] X-MxL-Spam-Verdict: No In a message dated 19/07/2007 02:44:42 GMT Daylight Time, [EMAIL PROTECTED] writes: My suggestion is that you pick up a free evaluation copy of Rick Hambly's TAC32 software at http://cnssys.com/cnsclock/Tac32Software.html . TAC32 knows all the quirks options that ever existed in a Motorola receiver, going all the way back to the Rev.3 PVT6. Then if you find it useful, a legal copy can be purchased from Rick, or at members discount from TAPR (http://www.tapr.org/gps_tac32.html). --- Hi Tom Many thanks for the suggestion. You may have seen my subsequent post in which I commented that I had tried TAC32 without solving my problem, only to find the kit was working ok but with an incorrectly labelled connector. TAC32 does look useful though so I'll check it over more thoroughly later. One interesting side effect.. Some time after shutting down TAC32 last night, but with the Oncore still connected to the serial port and outputting data, my PS2 connected mouse started misbehaving, with the pointer jumping all over the place then settling down for a while before repeating the performance. It didn't occur to me at first that the incoming serial data might have anything to do with it until it started again this morning and I eventually stopped it by disconnecting the serial lead from the receiver. Whilst I can't say for sure that running TAC32 was what caused it, it's not something I've ever seen in the past nor previously this past few days after running WinOncore. I'll check later to see if the port shut down properly and also take a look at the Oncore message stream, perhaps TAC32 may have changed something there as part of its auto setup routine? regards Nigel GM8PZR ___ 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] Oncore VP problem
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In a message dated 19/07/2007 12:33:07 GMT Daylight Time, [EMAIL PROTECTED] writes: In the TAC32 documentation, you will read about Mouse data and GPS data ! Theres a command line switch to run that should resolve it. Brian N4FMN -- Thanks Brian XP was bring up a false pointing device at startup, just as described, and disabling that has fixed it. I like to think I would have got there eventually but, as you realised:-), hadn't got round to reading the manual yet as I was just pleased to have the Oncore working. Looking at the current incoming traffic from the Oncore shows that the Bb, Ea, and Ek, strings are all coming in on a once per second basis. Prior to running TAC32 I had only been seeing the Bb and Ea strings so I presume TAC32 automatically enables the Ek command. As I hadn't seen the problem before I'm guessing it's something in the Ek string that caused it, in my case anyway. Perhaps it's time to read the rest of the manual :-) regards Nigel GM8PZR ___ 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] Austron 1120 ...thanks
Hi Alan, Glad it was some help. Rob is a mine of useful information, and is always helping out fellow 'nuts, I was pleased to take some of the burden off his modem as I had the opportunity. TTFN, Peter Hi Peter thanks for that I have had an 1120-2 1MHz unit sulking in my might be useful sometime box for a couple of years. Cheers de Alan G3NYK (Ipswich) - Original Message - From: Peter Vince [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: 19 July 2007 08:55 Subject: Re: [time-nuts] Austron 1120 questions Hi Bjorn, Another list member (Rob Kimberley) sent me a copy of a PDF earlier this year, but it is for the later, 1986 model, which had an octal tube base. It is just over 2 megabytes, so with Rob's blessing I've put it on my website - http://www.barney-wol.net/private/Austron1120.pdf - in case it is of any use. Regards, Peter Vince (G8ZZR, London, England) 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] Austron 1120 ...thanks
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Jeffrey, Peter Rob, Thanks for helping out! -- Björn On Thu, July 19, 2007 15:43, Peter Vince said: Hi Alan, Glad it was some help. Rob is a mine of useful information, and is always helping out fellow 'nuts, I was pleased to take some of the burden off his modem as I had the opportunity. TTFN, Peter Hi Peter thanks for that I have had an 1120-2 1MHz unit sulking in my might be useful sometime box for a couple of years. Cheers de Alan G3NYK (Ipswich) - Original Message - From: Peter Vince [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: 19 July 2007 08:55 Subject: Re: [time-nuts] Austron 1120 questions Hi Bjorn, Another list member (Rob Kimberley) sent me a copy of a PDF earlier this year, but it is for the later, 1986 model, which had an octal tube base. It is just over 2 megabytes, so with Rob's blessing I've put it on my website - http://www.barney-wol.net/private/Austron1120.pdf - in case it is of any use. Regards, Peter Vince (G8ZZR, London, England) 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] Oncore VP problem
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In a message dated 19/07/2007 02:44:42 GMT Daylight Time, [EMAIL PROTECTED] writes: My suggestion is that you pick up a free evaluation copy of Rick Hambly's TAC32 software at http://cnssys.com/cnsclock/Tac32Software.html . TAC32 knows all the quirks options that ever existed in a Motorola receiver, going all the way back to the Rev.3 PVT6. Then if you find it useful, a legal copy can be purchased from Rick, or at members discount from TAPR (http://www.tapr.org/gps_tac32.html). --- Hi Tom Many thanks for the suggestion. You may have seen my subsequent post in which I commented that I had tried TAC32 without solving my problem, only to find the kit was working ok but with an incorrectly labelled connector. TAC32 does look useful though so I'll check it over more thoroughly later. One interesting side effect.. Some time after shutting down TAC32 last night, but with the Oncore still connected to the serial port and outputting data, my PS2 connected mouse started misbehaving, with the pointer jumping all over the place then settling down for a while before repeating the performance. It didn't occur to me at first that the incoming serial data might have anything to do with it until it started again this morning and I eventually stopped it by disconnecting the serial lead from the receiver. Whilst I can't say for sure that running TAC32 was what caused it, it's not something I've ever seen in the past nor previously this past few days after running WinOncore. I'll check later to see if the port shut down properly and also take a look at the Oncore message stream, perhaps TAC32 may have changed something there as part of its auto setup routine? regards Nigel GM8PZR Nigel This is a well known quirk/feature of Windows itself. There is a way of curing it (other than using a better OS) but I cant recall the details at the moment. Bruce ___ 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] manual request: Austron 2201A
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Thanks, Rob! My unit has: 23411437-2 Time Code (IRIG-B) 23411900 Sine Output I also have a 23412342 LORAN MODULE, not sure if it is for this unit. Thanks for checking. Jamie --- Rob Kimberley [EMAIL PROTECTED] wrote: Jamie, I believe I have one in the store. Will take a look tonight when I get back. May also be some of the module manuals. What plug-ins does it have? Rob Kimberley -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 18 July 2007 23:30 To: time-nuts@febo.com Subject: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Looking for a manual for an Austron 2201A GPS receiver. Thanks! --Jamie Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. http://smallbusiness.yahoo.com/webhosting ___ 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] Fury GPS
Wow - only $750 in quantity of 20 or $1k in singles. That's not much more than what you spend putting together your own. By the time you come up with the HP-10811, controller, power supplies and GPS you have come close. So, can I borrow $1k from someone? :) Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos more. http://mobile.yahoo.com/go?refer=1GNXIC ___ 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] Oncore VP problem
How big would the sawtooth be for an m12+? Warner The M12+ has a 3x smaller sawtooth; about ±16 ns (9 ns rms) vs. the VP sawtooth which is about ± 52 ns (31 ns rms). See: http://www.leapsecond.com/pages/m12/sawtooth.htm http://www.leapsecond.com/pages/vp/sawtooth.htm /tvb ___ 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] Motorola Chips
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] From: geo [EMAIL PROTECTED] Subject: Re: [time-nuts] Motorola Chips Date: Wed, 18 Jul 2007 21:48:34 + Message-ID: [EMAIL PROTECTED] Hi fellow time-nuts, yes, the internet shoeem's to suffer from Altzheimer's desease ;-) I could send you datasheets of RFIC1501,RFIC1502 and SCS38140. The file size as ZIP-file would be about 680kByte. I have not received the datasheets from Martin (thanks again!) and can put them up if anyone needs them. The sad thing is that white the overall schetch of the innards of the SCS38140 (the 8 channel OnCore ASIC) no other details is really disclosed there. There ougth to be a user manual and application notes lying around somewhere and both I and Martin would be happy to receive those. Also for other versions of the Motorola chipsets. So, anyone? Randy? 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] manual request: Austron 2201A
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Jamie, Config sounds reasonable. The 2201A did have a LORAN-C assist module. Will check through and let you know what I have. Will only ask that you cover any postage charges on the package. Payment via PayPal works for me. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 19 July 2007 15:28 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Thanks, Rob! My unit has: 23411437-2 Time Code (IRIG-B) 23411900 Sine Output I also have a 23412342 LORAN MODULE, not sure if it is for this unit. Thanks for checking. Jamie --- Rob Kimberley [EMAIL PROTECTED] wrote: Jamie, I believe I have one in the store. Will take a look tonight when I get back. May also be some of the module manuals. What plug-ins does it have? Rob Kimberley -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 18 July 2007 23:30 To: time-nuts@febo.com Subject: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] time-nuts-bounces+bo.c om Looking for a manual for an Austron 2201A GPS receiver. Thanks! --Jamie Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. http://smallbusiness.yahoo.com/webhosting ___ 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] Oncore VP problem
Nigel, The bouncing mouse is always a fun problem. If you go up to the Synergy at: http://www.synergy-gps.com/images/stories/ShopTalk/disabling detection of microsoft ballpoint mouse.pdf there is an old paper I wrote about this problem. Disabling the mouse in the Windows system folder works pretty well, but on more than one occasion I have seen it mysteriously reappear. As you noted, this only happens when the receiver is plugged in during a boot. If the receiver is plugged in during a boot, unplugging it and plugging it back in will not help. Apparently this is a system variable that is set during boot. The second half of the paper is the registry fix that Rick Hambly showed me several years ago. I think this method is included in his TAC32 user manuals. This is the way to REALLY shut the serial mouse down for good. Note that this problem is not limited to VP receivers. If you have anything plugged into a serial port outputting data during boot that your computer thinks is valid mouse data the same thing will happen. Best regards, Randy Warner Senior Applications Engineer Geodetics, Inc. 858.729.0872 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Thursday, July 19, 2007 3:13 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Oncore VP problem ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In a message dated 19/07/2007 02:44:42 GMT Daylight Time, [EMAIL PROTECTED] writes: My suggestion is that you pick up a free evaluation copy of Rick Hambly's TAC32 software at http://cnssys.com/cnsclock/Tac32Software.html . TAC32 knows all the quirks options that ever existed in a Motorola receiver, going all the way back to the Rev.3 PVT6. Then if you find it useful, a legal copy can be purchased from Rick, or at members discount from TAPR (http://www.tapr.org/gps_tac32.html). --- Hi Tom Many thanks for the suggestion. You may have seen my subsequent post in which I commented that I had tried TAC32 without solving my problem, only to find the kit was working ok but with an incorrectly labelled connector. TAC32 does look useful though so I'll check it over more thoroughly later. One interesting side effect.. Some time after shutting down TAC32 last night, but with the Oncore still connected to the serial port and outputting data, my PS2 connected mouse started misbehaving, with the pointer jumping all over the place then settling down for a while before repeating the performance. It didn't occur to me at first that the incoming serial data might have anything to do with it until it started again this morning and I eventually stopped it by disconnecting the serial lead from the receiver. Whilst I can't say for sure that running TAC32 was what caused it, it's not something I've ever seen in the past nor previously this past few days after running WinOncore. I'll check later to see if the port shut down properly and also take a look at the Oncore message stream, perhaps TAC32 may have changed something there as part of its auto setup routine? regards Nigel GM8PZR ___ 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] manual request: Austron 2201A
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Jamie, Have checked and have the following 2201 manuals (note not 2201A) Model 2201 Op Maintenance manual P/N 12711946 REV A (received from Austron March '91) 2200/2201 Loran-C Assist Module Option P/N 12812503 2029A GPS Antenna P/N 12712553-2 REV A (received from Austron March '92) 2201 OCXO Option Module Manual P/N 12712281 REV A (March '91) 2201 OCXO Option Module Manual P/N 12712122 REV A (March '91) Let me know if you are interested and your mailing address. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 19 July 2007 15:28 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Thanks, Rob! My unit has: 23411437-2 Time Code (IRIG-B) 23411900 Sine Output I also have a 23412342 LORAN MODULE, not sure if it is for this unit. Thanks for checking. Jamie --- Rob Kimberley [EMAIL PROTECTED] wrote: Jamie, I believe I have one in the store. Will take a look tonight when I get back. May also be some of the module manuals. What plug-ins does it have? Rob Kimberley -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 18 July 2007 23:30 To: time-nuts@febo.com Subject: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] time-nuts-bounces+bo.c om Looking for a manual for an Austron 2201A GPS receiver. Thanks! --Jamie Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. http://smallbusiness.yahoo.com/webhosting ___ 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] Iforomation request XR5 M
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Robert, I have an old colleague who used to work for Navstar in Daventry. Will try to find out what he knows. Rob K -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Atkinson Sent: 19 July 2007 09:10 To: Discussion of precise time and frequency measurement Subject: [time-nuts] Iforomation request XR5 M ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Hi all, I've had to admit defeat on web searches for connection information on this receiver. It's a NavStar XR5M. These were a popular GPS in a diecast box with screw-lock DIN connectors on the front. Later ones were marked 12 Channel (mine is not), they were sold under several different makers names. Does anyone have any connection information, or even better a manual? Many thanks, Robert G8RPI. Genetix Limited - Queensway, New Milton, Hampshire, BH25 5NN Registered in England No. 2660050 www.genetix.com Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600. The unauthorised use, disclosure, copying or alteration of this message is strictly forbidden. This mail and any attachments have been scanned for viruses prior to leaving Genetix network. Genetix will not be liable for direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from alteration of the contents of this message by a third party. ___ 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] Fury PR in GPS World... Part 2
In a message dated 7/19/2007 00:32:15 Pacific Daylight Time, [EMAIL PROTECTED] writes: Forgot to mention the low noise floor in the article!! Rob Kimberley Hi Rob, thanks for the pointer, even we didn't know we can reach 1155dBc/Hz! But check out our 1112 accuracy as well :) The guys at the wire service are definitely not time-nuts. BTW: we do offer Fury with SMA connectors instead of the internal OCXO so a user can use their own (10811 etc) OCXO. We've evaluated disciplining even Rb's with this setup successfully. The SMA Fury building block will be cheaper than the standard Fury of course, but pricing has not yet been fixed for it. bye, Said ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour ___ 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] Active LF Antennas
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Is the Doug Baker LF antenna still available? If so, how does one go about obtaining one? Get the Yahoo! toolbar and be alerted to new email wherever you're surfing. http://new.toolbar.yahoo.com/toolbar/features/mail/index.php ___ 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] manual request: Austron 2201A
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Brooke, Good to hear from you. The Austron 2029A used 10 MHz LO and a 75.42MHz IF. Power was 15VDC at 175mA. The manual I have is pretty thin - no schematics just a spec block diagram and an installation guide. Will email you block diagram directly. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brooke Clarke Sent: 19 July 2007 18:22 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Hi Rob: I have an Quantic Q5200 GPS receiver that needs a special down converting antenna and have never seen one. I've thought of making one, but don't have enough information for the design. Does the 2029A manual have a block diagram or other design information? The Q5200 sends both +15 Vdc power and a 11.114 MHz reference frequency up the cable to the Antenna Module. The Antenna Module receives the satellite L1 frequency and down converts the signal to an IF of 153.028 MHz which is sent down the cable to the receiver. http://www.prc68.com/I/Q5200.shtml But how is a mystery. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com Rob Kimberley wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Jamie, Have checked and have the following 2201 manuals (note not 2201A) Model 2201 Op Maintenance manual P/N 12711946 REV A (received from Austron March '91) 2200/2201 Loran-C Assist Module Option P/N 12812503 2029A GPS Antenna P/N 12712553-2 REV A (received from Austron March '92) 2201 OCXO Option Module Manual P/N 12712281 REV A (March '91) 2201 OCXO Option Module Manual P/N 12712122 REV A (March '91) Let me know if you are interested and your mailing address. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 19 July 2007 15:28 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: time-nuts-bounces+rk=timing-consultants.com+rk=timing-consultants.com@ time-nuts-bounces+febo.c om Thanks, Rob! My unit has: 23411437-2 Time Code (IRIG-B) 23411900 Sine Output I also have a 23412342 LORAN MODULE, not sure if it is for this unit. Thanks for checking. Jamie --- Rob Kimberley [EMAIL PROTECTED] wrote: Jamie, I believe I have one in the store. Will take a look tonight when I get back. May also be some of the module manuals. What plug-ins does it have? Rob Kimberley -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James R. Gorr Sent: 18 July 2007 23:30 To: time-nuts@febo.com Subject: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: time-nuts-bounces+rk=timing-consultants.com+rk=timing-consultants.com@ time-nuts-bounces+fe time-nuts-bounces+bo.c om Looking for a manual for an Austron 2201A GPS receiver. Thanks! --Jamie __ __ Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. http://smallbusiness.yahoo.com/webhosting ___ 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] manual request: Austron 2201A
Hi Rob: The Austron antenna is very straight forward. A 10.0 MHz ref is sent up the coax along with 15VDC. The antenna multiplied by 50 and uses the 500 MHz to drive a harmonic mixer thus subtracting 1500 MHz from L1 leaving 75 MHz to go down the coax. Simple and clean. There must have been some special consideration that caused Quantic to use such a strange scheme. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com Rob Kimberley wrote: Hi Brooke, Good to hear from you. The Austron 2029A used 10 MHz LO and a 75.42MHz IF. Power was 15VDC at 175mA. The manual I have is pretty thin - no schematics just a spec block diagram and an installation guide. Will email you block diagram directly. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brooke Clarke Sent: 19 July 2007 18:22 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Hi Rob: I have an Quantic Q5200 GPS receiver that needs a special down converting antenna and have never seen one. I've thought of making one, but don't have enough information for the design. Does the 2029A manual have a block diagram or other design information? The Q5200 sends both +15 Vdc power and a 11.114 MHz reference frequency up the cable to the Antenna Module. The Antenna Module receives the satellite L1 frequency and down converts the signal to an IF of 153.028 MHz which is sent down the cable to the receiver. http://www.prc68.com/I/Q5200.shtml But how is a mystery. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.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] manual request: Austron 2201A
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Brooke, I agree. When I looked at the Quantic numbers you gave me, I sort of hit a mental block - not logical to me. Meinberg's current GPS antenna has following characteristics 10 MHz LO 35.4 MHz IF 12V - 18VDC Power http://www.meinberg.de/download/docs/manuals/english/gpsant.pdf For more info. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brooke Clarke Sent: 19 July 2007 20:50 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om Hi Rob: The Austron antenna is very straight forward. A 10.0 MHz ref is sent up the coax along with 15VDC. The antenna multiplied by 50 and uses the 500 MHz to drive a harmonic mixer thus subtracting 1500 MHz from L1 leaving 75 MHz to go down the coax. Simple and clean. There must have been some special consideration that caused Quantic to use such a strange scheme. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com Rob Kimberley wrote: Hi Brooke, Good to hear from you. The Austron 2029A used 10 MHz LO and a 75.42MHz IF. Power was 15VDC at 175mA. The manual I have is pretty thin - no schematics just a spec block diagram and an installation guide. Will email you block diagram directly. Rob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brooke Clarke Sent: 19 July 2007 18:22 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] manual request: Austron 2201A ); SAEximRunCond expanded to false Errors-To: time-nuts-bounces+rk=timing-consultants.com+rk=timing-consultants.com@ time-nuts-bounces+febo.c om Hi Rob: I have an Quantic Q5200 GPS receiver that needs a special down converting antenna and have never seen one. I've thought of making one, but don't have enough information for the design. Does the 2029A manual have a block diagram or other design information? The Q5200 sends both +15 Vdc power and a 11.114 MHz reference frequency up the cable to the Antenna Module. The Antenna Module receives the satellite L1 frequency and down converts the signal to an IF of 153.028 MHz which is sent down the cable to the receiver. http://www.prc68.com/I/Q5200.shtml But how is a mystery. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.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.
[time-nuts] german clock museum, event on quartz clocks
hello fellow time nuts and especially to those in germany there will be an event at the 'deutsches uhrenmuseum furtwangen' to celebrate and explore the development of the quartz clock. the first german quartz clock made by udo adelsberger and arnold scheibe will be displayed and donated to the museum. furthermore a patek phillipe 'chronotome' will be donated and displayed. two days of presentations from the engieneers, watchmakers and collectors. check out the pdf and maybe you'll be interested and i will meet you there in august: http://www.deutsches-uhrenmuseum.de/~upload/file_du_p499_1.pdf best regards, sebastian SEBASTIAN STOLP - Office: +41 (0) 56 534.56.26 Goetzhuserweg 165 Mobile: +41 (0) 76 200.00.80CH-Habsburg Email: [EMAIL PROTECTED] Schweiz/Suisse/Switzerland - ___ 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] Metastability in a 100 MHz TIC
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Richard H McCorkle wrote: With the discussions here on metastable states in TIC counters, I am asking the experts on the list for their opinion if the performance of this design would improve by adding a shift register synchronizer between the phase detector output and the count enable input of the 74F163A TIC to reduce metastable states. The 74F series has the best reliability figures from metastable effects of all the TTL logic families according to the data I have read. Each D F/F counter cell in the 74F163A has the clock applied directly to the F/F, so no clock gating occurs. Instead the input data is gated by count enable signals for each cell and either the cell output is sent to the D input if the count enable is low, or the previous cell output is gated into the D input on carry if the count enable is high with D latched into all F/Fs on each clock rising edge. While I see the need for a synchronizing shift register in a gated clock design like the original Shera controller, is it necessary for best performance in a GPSDRO application with a 74F163A 100 MHz TIC? It is always advisable to use a synchroniser to substantially reduce any bias in the averaged phase due to metastability. However unless there is very high isolation between the 100MHz XO and the LPRO output as well as the 100MHz XO the divided down output of the LPRO injection locking of the 100MHz oscillator may be a more significant source of bias in the averaged phase. If the PPS signal from the GPS timing receiver has sufficient random noise (~10ns) then this should not be an issue. When designing a synchroniser it is useful to have a quntitative model of the metastability characteristics of the devices used so that a reasonably accurate estimate of its output metastability rate can be calculated. Bruce ___ 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] manual request: Austron 2201A
From: Rob Kimberley [EMAIL PROTECTED] Subject: Re: [time-nuts] manual request: Austron 2201A Date: Thu, 19 Jul 2007 21:40:32 +0100 Message-ID: !!AAAYAOYAZyOzV8ERq+LmT45ypI7CgAAAEHNkDDJzE/[EMAIL PROTECTED] Hi Rob, I agree. When I looked at the Quantic numbers you gave me, I sort of hit a mental block - not logical to me. Meinberg's current GPS antenna has following characteristics 10 MHz LO 35.4 MHz IF 12V - 18VDC Power http://www.meinberg.de/download/docs/manuals/english/gpsant.pdf For more info. Lower cable damping at lower frequencies allows for longer cable runs. Very handy when considering putting GPS receivers into underground telecom bunkers. Fiber link is also a very good thing in those cases. Both is a must if you want to play in that leage, and Meinberg wants that. Now, If you look at the Zarlink GP2015 GPS Frontend chip you will find how well it fits with this scheme. You apply 10 MHz to the chip, it PLL locks a 1,4 GHz VCO and mixes down with that (1575,42 - 1400 = 175,42 MHz), then it goes for a filtering round and then comes back for the second mixer at a tenth of the VCO frequency, i.e. 140 MHz (175,52 - 140 = 35,42 MHz) again goes out for a filtering-round (through a SAW filter) and back in for a mixdown with 31,11 MHz (actually 280 / 9 MHz) producing a 4,309 MHz signal which is then sampled at 5,714 MHz (actually 40 / 7 MHz) producing 1,405 MHz carrier frequency in the 5,714 Msamples/s 2-bit datastream. The Meinberg trick can be done by simply put one frontend chip in the antenna and another in the receiver. Both is fed the same 10 MHz clock but you pick up the signal after the 2nd mixdown stage and transport that IF over the cable and then toss in it at that place in the receivers frontend. The AGC there will automatically compensate for cable damping which happends around the 3rd mixdown. The HF part of the frontend in the receiver it just kept as dead functionality. Same goes for the 3rd stage in the antenna. Fairly clean and simple. 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] Active LF Antennas
Tom - not a direct answer to your question, but as an alternative, Wellbrook here in the UK do a wideband amplified loop antenna - see: http://www.wellbrook.uk.com/products.html#LFL1010 Regards, Peter Tom Clifton wrote: Is the Doug Baker LF antenna still available? If so, how does one go about obtaining one? ___ 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] Fury PR in GPS World... Part 2
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In a message dated 7/19/2007 16:37:05 Pacific Daylight Time, [EMAIL PROTECTED] writes: Do I understand that a version is available that takes in an external 10MHz clock and internally disciplines that to GPS? Perhaps by DDS techniques? Regards, Peter Hi Peter, Thanks so much for your question! Let me try to explain how Fury can be used: We can steer an external 10MHz source with an analog voltage (0V to 5) with 24+ bits of resolution, so the actual disciplining is happening in the external steerable source via EFC voltage from the Fury. There are two ways an external source can be used: the first is to remove the on-board GPS receiver, and feed an external 1PPS into the unit (say from a dirty Rubidium that needs to be cleaned up). This is often done where GPS reception could be denied (military apps for example). The Fury has a 1PPS input connector for this purpose. In the second option we remove the on-board OCXO, and replace it with two SMA connectors, one is used to feed 10MHz into the Fury from the external OCXO, the other feeds the EFC control voltage (0V to 5V) to the OCXO for steering. The steering is done through a 24+ bits DAC into the OCXO, so there is no DDS on the Fury. The OCXO can be anything as long as it has 10MHz output and is steerable. It can be a Rb or Cs, Cs Fountain, SAW oscillator, etc. :) Actually, with a slight firmware change we can discipline almost any oscillator from 1MHz to 15MHz+ if we had to. It's a more traditional analog steering using the OCXO itself. I understand that the DDS method is patent-protected, and it also has the drawback of requiring a fast DDS running at some GPS-asynchronous frequency (say 400MHz, or 1GHz) which could create noise and beat frequencies with the steered 10MHz output. The DDS implementation is also a sampled-data system, so issues such as aliasing, Nyquist issues, Spurs, etc. have to be carefully addressed not to show up in the -155dBc/Hz or better noise-floor we are aiming for. I personally like the simple, but elegant Varacter-Diode steered-Crystal solution better than having a DDS do the trick. That said, our FireFox DDS-based synthesizer can generate signals with 10 microhertz resolution, and is controllable via SCPI commands over RS-232, so with a bit of software running on a PC (etc) and an external phase-comparator it could be used to generate a software-steerable GPSDO. Hope this answers your question, thanks again, bye, Said ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour ___ 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] Fury PR in GPS World... Part 2
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] From: [EMAIL PROTECTED] Subject: Re: [time-nuts] Fury PR in GPS World... Part 2 Date: Thu, 19 Jul 2007 20:18:03 EDT Message-ID: [EMAIL PROTECTED] Said, The steering is done through a 24+ bits DAC into the OCXO, so there is no DDS on the Fury. The OCXO can be anything as long as it has 10MHz output and is steerable. It can be a Rb or Cs, Cs Fountain, SAW oscillator, etc. :) Maybe I could consider it if you toss a Cs Foutain or two with it from your spare heap of things. One should really have three, that would be spectacular! :-) 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] Active LF Antennas
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Brooke - you scored a bullseye on that one. I had a couple of false starts, but got an email back from Frank Gentges suggesting I contact Far Circuits for the PC boards ($11.50 for the set which includes shipping). Now to obtain the rest of the parts... I received an HP-3586C via UPS today and it is in great shape. Hoping to do some playing around with LF as well as FMT with K5CM and his gang of FMT-Nuts... So many great ideas and only 24 hours in a day... Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. http://smallbusiness.yahoo.com/webhosting ___ 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] Active LF Antennas
Since the article and FAQ on the AMRAD site were written, the split bobbin transformer is has become available from Digi-Key. You don't have to special order it. I was glad I ordered 10 of the Crystalonics JFETs for that project. Four of them were defective as delivered (D-S short). You can save some bucks by going the J310 route first and upgrading to the CP666 only if you actually have IMD problems. -- john, KE5FX ___ 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.
