Re: [time-nuts] FE-5680 frequency jump
On Fri, 5 Apr 2013 23:18:49 -0600 (MDT) Don Latham d...@montana.com wrote: Actually, mumetal easily loses permeability, hence shielding ability, by mechanical stress or heat. Some mumetals are made to bend for boxes and the like, sheets available from electronics goldmine, I think. Actually, one of the questions i had in my head when waking up this morning was: Mumetal is pretty sensitive to everything.. but how is it machined if bending and heating damage it? Attila Kinali -- The people on 4chan are like brilliant psychologists who also happen to be insane and gross. -- unknown ___ 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] FE-5680 frequency jump
Attila Kinali wrote: On Fri, 5 Apr 2013 23:18:49 -0600 (MDT) Don Lathamd...@montana.com wrote: Actually, mumetal easily loses permeability, hence shielding ability, by mechanical stress or heat. Some mumetals are made to bend for boxes and the like, sheets available from electronics goldmine, I think. Actually, one of the questions i had in my head when waking up this morning was: Mumetal is pretty sensitive to everything.. but how is it machined if bending and heating damage it? Attila Kinali By annealing it afterwards in a hydrogen atmosphere at around 400C. 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] FE-5680 frequency jump
On 04/06/2013 02:22 AM, EB4APL wrote: Thank you for the info, I used to attach a magnetic mount surface thermometer to my FRS-C to check its operating temperature after installing it in a box. I think it is time to power it up and after some days check it against the GPS. Ehm. Rubidiums is tweaked by magnetic field adjustments, and you have my-metal shields to shield of ambient fields as they go in the wrong direction typically, change, etc. Use the C-field EFC input and not magnets to tweak it... Please keep magnets away! Cheers, Magnus Regards, Ignacio EB4APL On 05/04/2013 20:59, Bob Quenelle wrote: I found the cause of the 4 mHz frequency jump. I have an LPRO-101, an FE-5680, power supplies and a Motorola M12T GPS board in a surplus case. When I put the case away to work on another project I piled the hockey puck antenna and lead in the case and it happened to land on the FE-5680. I noticed the antenna stuck firmly to the FE-5680 case when I got the project back out. I found I could get a 6 mHz (0.6 ppb) shift comparing the frequency with residual magnetism from the magnet stuck on the FE-5680 case to the frequency after demagnetizing the FE-5680 case. Unintentional C field adjustment. Dope slap, live and learn. 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. ___ 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] FE-5680 frequency jump
On 04/06/2013 09:34 AM, Attila Kinali wrote: On Fri, 5 Apr 2013 23:18:49 -0600 (MDT) Don Lathamd...@montana.com wrote: Actually, mumetal easily loses permeability, hence shielding ability, by mechanical stress or heat. Some mumetals are made to bend for boxes and the like, sheets available from electronics goldmine, I think. Actually, one of the questions i had in my head when waking up this morning was: Mumetal is pretty sensitive to everything.. but how is it machined if bending and heating damage it? As mentioned on this list, you re-anneal it again. Bruce has more details. http://en.wikipedia.org/wiki/Mu-metal http://www.magnetic-shield.com/pdf/mu-2.pdf 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] FE-5680 frequency jump
On 04/06/2013 10:06 AM, Bruce Griffiths wrote: Attila Kinali wrote: On Fri, 5 Apr 2013 23:18:49 -0600 (MDT) Don Lathamd...@montana.com wrote: Actually, mumetal easily loses permeability, hence shielding ability, by mechanical stress or heat. Some mumetals are made to bend for boxes and the like, sheets available from electronics goldmine, I think. Actually, one of the questions i had in my head when waking up this morning was: Mumetal is pretty sensitive to everything.. but how is it machined if bending and heating damage it? Attila Kinali By annealing it afterwards in a hydrogen atmosphere at around 400C. The link I just tossed in another message says 1121C. 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] FE-5680 frequency jump
On 04/06/2013 01:21 PM, Magnus Danielson wrote: On 04/06/2013 09:34 AM, Attila Kinali wrote: On Fri, 5 Apr 2013 23:18:49 -0600 (MDT) Don Lathamd...@montana.com wrote: Actually, mumetal easily loses permeability, hence shielding ability, by mechanical stress or heat. Some mumetals are made to bend for boxes and the like, sheets available from electronics goldmine, I think. Actually, one of the questions i had in my head when waking up this morning was: Mumetal is pretty sensitive to everything.. but how is it machined if bending and heating damage it? As mentioned on this list, you re-anneal it again. Bruce has more details. http://en.wikipedia.org/wiki/Mu-metal http://www.magnetic-shield.com/pdf/mu-2.pdf These links could be of further use: http://www.magnetic-shield.com/science-research-and-education.html http://www.magnetic-shield.com/faqs-all-about-shielding.html 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] FE-5680 frequency jump
Any TimeNutter worth his/her salt can do that..right! Lester B Veenstra MØYCM K1YCM W8YCM les...@veenstras.com -Original Message- By annealing it afterwards in a hydrogen atmosphere at around 400C. 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. ___ 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] FE-5680 frequency jump
On 4/6/13 6:08 AM, Lester Veenstra wrote: Any TimeNutter worth his/her salt can do that..right! $100 Presto 23 qt canning style pressure cooker, electric heating elements, thermocouple probes, some fiberglass insulation to reduce conductive losses. Do it in your backyard and have a straw broom handy to detect hydrogen fires. Be careful.. 400C is getting close to 660C aluminum melting point. I'm also not sure the gasket in the pressure cooker can take that temperature.. you might want to replace it with something else. Here's the reaction vessel: http://www.target.com/p/presto-23-quart-aluminum-pressure-cooker-canner/-/A-660065#prodSlot=medium_1_5 Now, if it's the 1000C+ that Magnus mentioned, that's a bit trickier.. Probably need a ceramic container. ___ 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] FE-5680 frequency jump
Hi On Apr 6, 2013, at 9:39 AM, Jim Lux jim...@earthlink.net wrote: On 4/6/13 6:08 AM, Lester Veenstra wrote: Any TimeNutter worth his/her salt can do that..right! $100 Presto 23 qt canning style pressure cooker, electric heating elements, thermocouple probes, some fiberglass insulation to reduce conductive losses. Do it in your backyard and have a straw broom handy to detect hydrogen fires. Be careful.. 400C is getting close to 660C aluminum melting point. I'm also not sure the gasket in the pressure cooker can take that temperature.. you might want to replace it with something else. Here's the reaction vessel: http://www.target.com/p/presto-23-quart-aluminum-pressure-cooker-canner/-/A-660065#prodSlot=medium_1_5 Now, if it's the 1000C+ that Magnus mentioned, that's a bit trickier.. Probably need a ceramic container. Gee, another use for the Big Green Egg…. I wonder how BBQ grease impacts the annealing process :) I don't think I would want 1000+ C hydrogen running around in a lash up system. There are just to many ways for things to go wrong. 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. ___ 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] FE-5680 frequency jump
On 4/6/13 6:55 AM, Bob Camp wrote: Hi On Apr 6, 2013, at 9:39 AM, Jim Lux jim...@earthlink.net wrote: On 4/6/13 6:08 AM, Lester Veenstra wrote: Any TimeNutter worth his/her salt can do that..right! $100 Presto 23 qt canning style pressure cooker, electric heating elements, thermocouple probes, some fiberglass insulation to reduce conductive losses. Do it in your backyard and have a straw broom handy to detect hydrogen fires. Be careful.. 400C is getting close to 660C aluminum melting point. I'm also not sure the gasket in the pressure cooker can take that temperature.. you might want to replace it with something else. Here's the reaction vessel: http://www.target.com/p/presto-23-quart-aluminum-pressure-cooker-canner/-/A-660065#prodSlot=medium_1_5 Now, if it's the 1000C+ that Magnus mentioned, that's a bit trickier.. Probably need a ceramic container. Gee, another use for the Big Green Egg…. I wonder how BBQ grease impacts the annealing process :) I suggest heading on down to the garden store for some clay pots.. I don't think I would want 1000+ C hydrogen running around in a lash up system. There are just to many ways for things to go wrong. John Strong's book has a picture of how to do it.. Shows small flames (invisible, of course) coming from the lid of the ceramic crucible wrapped in resistance wire and immersed in some sort of refractory sand. I've seen hydrogen brazing being done at a TWT manufacturing plant, and it's pretty low tech. One could definitely do it in your backyard, maybe even your apartment balcony. I don't know that I'd be generating the hydrogen by using aluminum foil in pool acid, but that's more out of laziness than anything else: getting a tank from the local gas supplier is pretty easy. The pressure of the H2 is basically slightly over atmospheric. Heated to 1000C, it's going to ignite where it leaks out, which is good, so you don't have a problem with hydrogen accumulation (and even that isn't an issue in the backyard) Since the flames are invisible, that's why you need that broom. (or the fancy IR viewing goggles, I suppose) ___ 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] Reading data from Thunderbolt using an Arduino
The earliest support for TSIP that many of us saw was the DOS source code to Trimble's old TSIPMONITOR and TSPCHAT programs. Google for two words TSIP_IFC.C TSIPCHAT.C to find old copies on the web. Or, perhaps safer, go to Trimble's own site ftp://ftp.trimble.com/pub/sct/embedded/bin/iQ/TOOLS/ and get iQSource.zip which contains the examples you need. /tvb - Original Message - From: Tom Van Baak t...@leapsecond.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, April 05, 2013 9:12 PM Subject: Re: [time-nuts] Reading data from Thunderbolt using an Arduino Yet another example of parsing TSIP is www.leapsecond.com/tools/tbtalk.c ___ 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] FE-5680 frequency jump
On 04/06/2013 04:23 PM, Jim Lux wrote: On 4/6/13 6:55 AM, Bob Camp wrote: Hi On Apr 6, 2013, at 9:39 AM, Jim Lux jim...@earthlink.net wrote: On 4/6/13 6:08 AM, Lester Veenstra wrote: Any TimeNutter worth his/her salt can do that..right! $100 Presto 23 qt canning style pressure cooker, electric heating elements, thermocouple probes, some fiberglass insulation to reduce conductive losses. Do it in your backyard and have a straw broom handy to detect hydrogen fires. Be careful.. 400C is getting close to 660C aluminum melting point. I'm also not sure the gasket in the pressure cooker can take that temperature.. you might want to replace it with something else. Here's the reaction vessel: http://www.target.com/p/presto-23-quart-aluminum-pressure-cooker-canner/-/A-660065#prodSlot=medium_1_5 Now, if it's the 1000C+ that Magnus mentioned, that's a bit trickier.. Probably need a ceramic container. Gee, another use for the Big Green Egg…. I wonder how BBQ grease impacts the annealing process :) I suggest heading on down to the garden store for some clay pots.. I don't think I would want 1000+ C hydrogen running around in a lash up system. There are just to many ways for things to go wrong. John Strong's book has a picture of how to do it.. Shows small flames (invisible, of course) coming from the lid of the ceramic crucible wrapped in resistance wire and immersed in some sort of refractory sand. I've seen hydrogen brazing being done at a TWT manufacturing plant, and it's pretty low tech. One could definitely do it in your backyard, maybe even your apartment balcony. I don't know that I'd be generating the hydrogen by using aluminum foil in pool acid, but that's more out of laziness than anything else: getting a tank from the local gas supplier is pretty easy. The pressure of the H2 is basically slightly over atmospheric. Heated to 1000C, it's going to ignite where it leaks out, which is good, so you don't have a problem with hydrogen accumulation (and even that isn't an issue in the backyard) Since the flames are invisible, that's why you need that broom. (or the fancy IR viewing goggles, I suppose) Back in the 80thies I skipped school to go to the university and play in their lab I made high-temperature semiconductors. We had to do essentially the same thing, but our target temperature was 950 degrees and it was oxygene environment. The over was essentially a ceramic tube with heating wires... just a large power resistor. Very low-tech. It's really the hydrogen environment which makes it a bit tricky, but having a continuous flow of hydrogen and just some minor blocking, and a pilot flame to burn of the leaking hydrogen if it has not been burned of should suffice. I think the main issue will be sourcing the right oven components, but just setting once's mine correctly they should be attainable. The power-bill is the issue. 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] FE-5680 frequency jump
On 04/06/2013 08:39 AM, Jim Lux wrote: On 4/6/13 6:08 AM, Lester Veenstra wrote: Any TimeNutter worth his/her salt can do that..right! $100 Presto 23 qt canning style pressure cooker, electric heating elements, thermocouple probes, some fiberglass insulation to reduce conductive losses. Do it in your backyard and have a straw broom handy to detect hydrogen fires. Be careful.. 400C is getting close to 660C aluminum melting point. I'm also not sure the gasket in the pressure cooker can take that temperature.. you might want to replace it with something else. Here's the reaction vessel: http://www.target.com/p/presto-23-quart-aluminum-pressure-cooker-canner/-/A-660065#prodSlot=medium_1_5 Now, if it's the 1000C+ that Magnus mentioned, that's a bit trickier.. Probably need a ceramic container. ___ 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. I had use for a kiln recently - found a very reasonable priced one at Vulcan Kilns: http://vulcankilns.com/ I got the JK-1 - 2250F (1232C) max temp. Easy to use benchtop unit. I added an inexpensive thermocouple controller unit to improve the temperature control. Has been very useful in annealing some metal springs for a project. I have no relationship with Vulcan other than being a satisfied customer. -- = Bob Smither, PhD Circuit Concepts, Inc. Every election is a sort of advance auction sale of stolen goods. -- Libertarian H.L. Mencken smit...@c-c-i.comhttp://www.C-C-I.Com281-331-2744 = attachment: smither.vcf___ 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] Reading data from Thunderbolt using an Arduino
Here is a related Arduino project. http://www.pjrc.com/teensy/td_libs_TinyGPS.html This is where I get my Arduino boards. I like the 32 bit Arduino processor for some applications. http://www.pjrc.com/store/teensy3.html Just a satisfied customer. John Cousins ___ 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] Reading data from Thunderbolt using an Arduino
On 4/6/13 12:44 PM, Ivan.Cousins wrote: Here is a related Arduino project. http://www.pjrc.com/teensy/td_libs_TinyGPS.html This is where I get my Arduino boards. I like the 32 bit Arduino processor for some applications. http://www.pjrc.com/store/teensy3.html I'm a big fan of their teensy3... 16 bit ADC in it (yeah, don't expect all 16 bits, but, it's a heck of a lot better than 12 bits) ___ 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] DATUM 9390-52054 Grief again...
Gang, You will remember several months ago I had some stranges that I thought were related to a defective Vectron oscillator in one of my DATUM 9390-52054. That turned out to be a the internal switching power supply so I replaced it with an external Cisco unit. I've done this in three units, two are mine and one belongs to Stu, K6YAZ. Well, I now have a different grief in one of my units. It had been cooking along swell with no problem ever since I replaced the power supply. This morning I notice that one of my units had the lock and tracking lights out. The display said that the signal level was low and there were no usable satellites. The 10 MHz output is also about 20 or more dB low. I assumed the power supply is all right because the display was working and it said it was 9-E9, not so good, but working - sorta. I swapped antennas and the good Datum was happy so I know the antenna is ok. when I got inside I checked the power supply rails and they're within .05 Volts of where they should be. There is 5 Volts on the GPS module and there is 4.96 Volts on the antenna Type-N connector (measured with the antenna line disconnected.) Power cycling the DATUM did not resolve the problem. Does anyone know if the symptoms above will occur if the 10 MHz oscillator is defective? I can understand it not tracking or not locked, but could this cause the receiver to not see or indicate any satellites? Since I only have two of these units on line, I'm very reluctant to start swapping modules because I would be without any working reference, so I need to keep one up and running. Both of my units are on a UPS, and according to the clocks in the kitchen, the bedroom, and the old VCR, we've not had a power interruption. I do not recognize the GPS receiver module, but it has the following number on it: TNL 22880-B. I have the schematics for the overall DATUM 9390-25054, but the GPS module in just a block. Any guidance would be appreciated. Thanks, Burt Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] DATUM 9390-52054 Grief again...
(Note: additional information about the receiver module has been added.) Burt Gang, You will remember several months ago I had some stranges that I thought were related to a defective Vectron oscillator in one of my DATUM 9390-52054. That turned out to be a the internal switching power supply so I replaced it with an external Cisco unit. I've done this in three units, two are mine and one belongs to Stu, K6YAZ. Well, I now have a different grief in one of my units. It had been cooking along swell with no problem ever since I replaced the power supply. This morning I notice that one of my units had the lock and tracking lights out. The display said that the signal level was low and there were no usable satellites. The 10 MHz output is also about 20 or more dB low. I assumed the power supply is all right because the display was working and it said it was 9-E9, not so good, but working - sorta. I swapped antennas and the good Datum was happy so I know the antenna is ok. when I got inside I checked the power supply rails and they're within .05 Volts of where they should be. There is 5 Volts on the GPS module and there is 4.96 Volts on the antenna Type-N connector (measured with the antenna line disconnected.) Power cycling the DATUM did not resolve the problem. Does anyone know if the symptoms above will occur if the 10 MHz oscillator is defective? I can understand it not tracking or not locked, but could this cause the receiver to not see or indicate any satellites? Since I only have two of these units on line, I'm very reluctant to start swapping modules because I would be without any working reference, so I need to keep one up and running. Both of my units are on a UPS, and according to the clocks in the kitchen, the bedroom, and the old VCR, we've not had a power interruption. I do not recognize the GPS receiver module, but it has the following number on it: TNL 22880-B. I have the schematics for the overall DATUM 9390-25054, but the GPS module in just a block. By the way, the GPS block on the DATUM overall schematic is marked, SV6 / (TANS). I suspect this means something noteworthy. Any guidance would be appreciated. Thanks, Burt Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] More information...DATUM 9390-52054 Grief again...
I notice that when it first turns on there is a message where I normally expect to see System Check ok. The message reads: N200/S116/DT202KP. I don't know what this is saying. Burt (Note: additional information about the receiver module has been added.) Burt Gang, You will remember several months ago I had some stranges that I thought were related to a defective Vectron oscillator in one of my DATUM 9390-52054. That turned out to be a the internal switching power supply so I replaced it with an external Cisco unit. I've done this in three units, two are mine and one belongs to Stu, K6YAZ. Well, I now have a different grief in one of my units. It had been cooking along swell with no problem ever since I replaced the power supply. This morning I notice that one of my units had the lock and tracking lights out. The display said that the signal level was low and there were no usable satellites. The 10 MHz output is also about 20 or more dB low. I assumed the power supply is all right because the display was working and it said it was 9-E9, not so good, but working - sorta. I swapped antennas and the good Datum was happy so I know the antenna is ok. when I got inside I checked the power supply rails and they're within .05 Volts of where they should be. There is 5 Volts on the GPS module and there is 4.96 Volts on the antenna Type-N connector (measured with the antenna line disconnected.) Power cycling the DATUM did not resolve the problem. Does anyone know if the symptoms above will occur if the 10 MHz oscillator is defective? I can understand it not tracking or not locked, but could this cause the receiver to not see or indicate any satellites? Since I only have two of these units on line, I'm very reluctant to start swapping modules because I would be without any working reference, so I need to keep one up and running. Both of my units are on a UPS, and according to the clocks in the kitchen, the bedroom, and the old VCR, we've not had a power interruption. I do not recognize the GPS receiver module, but it has the following number on it: TNL 22880-B. I have the schematics for the overall DATUM 9390-25054, but the GPS module in just a block. By the way, the GPS block on the DATUM overall schematic is marked, SV6 / (TANS). I suspect this means something noteworthy. Any guidance would be appreciated. Thanks, Burt Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] DATUM 9390-52054 Grief again...
b...@att.net said: By the way, the GPS block on the DATUM overall schematic is marked, SV6 / (TANS). I suspect this means something noteworthy. SV6 or SVeeSix is an old old old Trimble module. Google finds stuff. I picked up a couple many years ago, or at least they were described as SV6. They match the picture here, including the box around the PCB. http://homepages.slingshot.co.nz/~geoff36/gps.htm I think they were used for tracking trucks. The PCB inside the box is 1.8 x 3.3 inches. That doesn't match the picture I found in a manual from Trimble. -- These are my opinions. I hate spam. ___ 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] DATUM 9390-52054 Grief again...
Hal, The two Dautm 9390-52054's that I have are about 15 to 20 years old. I did a google search earlier, but didn't find anything that quite looks like the GPS module inside my unit. I don't know if I can post a picture to this site, but I'll take a picture of the GPS module and give it a try. Since I posted the first and 2nd message about this problem, I've since posted what I'm sure is an error message: N200/S116/DT202KP. I have no idea what this is telling me. Thanks for your input. Burt At 04:12 PM 4/6/2013, time-nuts-requ...@febo.com wrote From: Hal Murray hmur...@megapathdsl.net Subject: Re: [time-nuts] DATUM 9390-52054 Grief again... b...@att.net said: By the way, the GPS block on the DATUM overall schematic is marked, SV6 / (TANS). I suspect this means something noteworthy. SV6 or SVeeSix is an old old old Trimble module. Google finds stuff. I picked up a couple many years ago, or at least they were described as SV6. They match the picture here, including the box around the PCB. http://homepages.slingshot.co.nz/~geoff36/gps.htm I think they were used for tracking trucks. The PCB inside the box is 1.8 x 3.3 inches. That doesn't match the picture I found in a manual from Trimble. Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] More information...DATUM 9390-52054 Grief again...
Hi Bert, SV6 is the model number for an old Trimble 6 channel GPS board. Info is available online. Maybe your receiver died. Ed On 4/6/2013 5:00 PM, Burt I. Weiner wrote: I notice that when it first turns on there is a message where I normally expect to see System Check ok. The message reads: N200/S116/DT202KP. I don't know what this is saying. Burt (Note: additional information about the receiver module has been added.) Burt Gang, You will remember several months ago I had some stranges that I thought were related to a defective Vectron oscillator in one of my DATUM 9390-52054. That turned out to be a the internal switching power supply so I replaced it with an external Cisco unit. I've done this in three units, two are mine and one belongs to Stu, K6YAZ. Well, I now have a different grief in one of my units. It had been cooking along swell with no problem ever since I replaced the power supply. This morning I notice that one of my units had the lock and tracking lights out. The display said that the signal level was low and there were no usable satellites. The 10 MHz output is also about 20 or more dB low. I assumed the power supply is all right because the display was working and it said it was 9-E9, not so good, but working - sorta. I swapped antennas and the good Datum was happy so I know the antenna is ok. when I got inside I checked the power supply rails and they're within .05 Volts of where they should be. There is 5 Volts on the GPS module and there is 4.96 Volts on the antenna Type-N connector (measured with the antenna line disconnected.) Power cycling the DATUM did not resolve the problem. Does anyone know if the symptoms above will occur if the 10 MHz oscillator is defective? I can understand it not tracking or not locked, but could this cause the receiver to not see or indicate any satellites? Since I only have two of these units on line, I'm very reluctant to start swapping modules because I would be without any working reference, so I need to keep one up and running. Both of my units are on a UPS, and according to the clocks in the kitchen, the bedroom, and the old VCR, we've not had a power interruption. I do not recognize the GPS receiver module, but it has the following number on it: TNL 22880-B. I have the schematics for the overall DATUM 9390-25054, but the GPS module in just a block. By the way, the GPS block on the DATUM overall schematic is marked, SV6 / (TANS). I suspect this means something noteworthy. Any guidance would be appreciated. Thanks, Burt Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. b...@att.net www.biwa.cc K6OQK ___ 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] Changing FE-5650A frequency?
Hi all, I've recently ripped some FE-5650A's out of some old equipment, but they seem to be a custom build, here you can see they have the option just listed as -: http://cambridge.m0tei.co.uk/files/IMG_20130330_232647.jpg They seem to be single rail (15v) supply with an 800kHz output. I wonder, does anyone know if it's possible to change its frequency? As far as i'm aware this model doesn't have serial control. Thanks, Alec M0TEI ___ 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] Changing FE-5650A frequency?
On Sun, Apr 07, 2013 at 12:41:10AM +0100, Alexander Wright wrote: Hi all, I've recently ripped some FE-5650A's out of some old equipment, but they seem to be a custom build, here you can see they have the option just listed as -: http://cambridge.m0tei.co.uk/files/IMG_20130330_232647.jpg They seem to be single rail (15v) supply with an 800kHz output. I wonder, does anyone know if it's possible to change its frequency? Open it up, take some nice pictures of the circuit boards and components and I can probably tell you what might be possible (after looking at them :). As far as i'm aware this model doesn't have serial control. best, Herbert Thanks, Alec M0TEI ___ 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] Changing FE-5650A frequency?
Hi Alec, You may be in luck. However, I would need some additional pictures, particularly of the connector on the bottom, also some of the inside. The primary physics package is a stand alone analog Rubidium frequency standard that outputs 50.255* MHz frequency. That signal is used to drive various output board configurations, included inside the unit, to provide a customer required output frequency. The more recent revised units (they look the same) use a new digital scheme that is much more of a hassle. The one that I and a number of people are familiar with is the 5650-option-58 model whose output was a 1pps. To get the 1pps the 50.255+ MHz signal was used to drive a Direct Digital Synthesizer (DDS) that produced 8.3+ MHz signal that was then divided down via normal TTL dividers to produce the 1pps. The DDS is capable of being changed to other frequencies up to about 20 MHz, however, the filter following the DDS needs to be changed or bypassed to properly filter the new frequency. Bypassing is the easiest method but would require using an external filter to get rid of aliasing and spurs. I put together a zip file of various information on FEI-5650-option 58 that will help you get familiar with the family line. If you have problems with the link let me know. Also, after you get a successful download let me know so I can reduce the FTP storage level, thank you. http://pages.suddenlink.net/stevewingate/cryptic1/for alec on 5650-option-58.zip BillWB6BNQ Alexander Wright wrote: Hi all, I've recently ripped some FE-5650A's out of some old equipment, but they seem to be a custom build, here you can see they have the option just listed as -: http://cambridge.m0tei.co.uk/files/IMG_20130330_232647.jpg They seem to be single rail (15v) supply with an 800kHz output. I wonder, does anyone know if it's possible to change its frequency? As far as i'm aware this model doesn't have serial control. Thanks, Alec M0TEI ___ 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] Changing FE-5650A frequency?
Hey Bill: Thanks for the archive Don I put together a zip file of various information on FEI-5650-option 58 that will help you get familiar with the family line. If you have problems with the link let me know. Also, after you get a successful download let me know so I can reduce the FTP storage level, thank you. http://pages.suddenlink.net/stevewingate/cryptic1/for alec on 5650-option-58.zip BillWB6BNQ -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. De Erroribus Medicorum, R. Bacon, 13th century. 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.
