[time-nuts] GPS-III
Hello All, Does anyone know yet of any companies that are making GPS-III receiver chip-sets/modules yet? Some web-sites on GPS-III: http://www.gps.gov/systems/gps/modernization/ http://www.gps.gov/systems/gps/modernization/civilsignals/ http://www.losangeles.af.mil/library/factsheets/factsheet.asp?id=18830 Regards, John W. ___ 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] GPS-III
On Thu, 24 Jul 2014 00:14:10 -0700 "John C. Westmoreland, P.E." wrote: > Does anyone know yet of any companies that are making GPS-III receiver > chip-sets/modules yet? Do you mean a L1 C/A / L2C receiver? I am not aware of any. AFAIK all dual band receiver are multichip solutions (ie multiple receiver chips, one for each band). Which makes those rather espensive for the very cost sensitive consumer market. Also, if i am not mistaken, only the Block IIM and Block IIF carry the L2C already (ie 14 satellites). I.e. coverage of that signal is not complete. The launch date of the first Block III has been pushed back more than once. It was meant to be somewhen this year, but i don't know what the current launch date is projected to be. Attila Kinali -- I pity people who can't find laughter or at least some bit of amusement in the little doings of the day. I believe I could find something ridiculous even in the saddest moment, if necessary. It has nothing to do with being superficial. It's a matter of joy in life. -- Sophie Scholl ___ 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 ts2100 gps error code 41: New clone ace III
Hi all! Have a Datum ts2100 that had a failed gps receiver. Found a replacement as a new "clone". The ts2100 with the new receiver does not set the right time, however, it does know where it is, reports the gps firmware version and gives satellite information. Prior to this, the only message that I could get regarding the gps receiver was "gps engine busy". The ts2100 never illuminates the "lock" or "tracking" led's on the front panel. When checking the menu available from the front panel, in the timing section, at the "gps health" prompt, the ts2100 reports the error "gps doing fixes error code 41" A google search reveals absolutely nothing. Norm n3ykf ___ 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] Noise and non-linear behaviour of ferrite transformers
Tom, I'd forgotten about those tests (time flies!). I strongly suspect that the bulk of the tempco is from the BPF rather than the transformers. I've been recommending against install the filter unless its really needed, for this very reason. I'll try to do some tempco measurements of one of my TADD-1 without the filter. John On 7/19/2014 9:52 PM, Tom Van Baak wrote: Watch out for the tempco of transformers. I ran into this with the TADD-1. Removing the inductors/transformers improved the tempco by 15x. http://www.leapsecond.com/pages/tadd-1/ /tvb - Original Message - From: "Attila Kinali" To: Sent: Saturday, July 19, 2014 3:09 PM Subject: [time-nuts] Noise and non-linear behaviour of ferrite transformers Hi, I'm currently looking at some way of breaking the ground loop between several systems. The obvious idea would be to use transformers. I would like to have some kind of rule of thumb to guess how much noise such a transformer would add. But unfortunately i cannot find any theory or measurements of this. Does anyone have some pointers to documents on what kind of noise i could expect (type, and strength) and what/how strong the non-linear behaviour of transformers would be? Thanks in advance Attila Kinali PS: although this started as something with a real application in mind, i'm now interested in this as an endavour of its own. So all and any data, theory or rule of thumb would be appreciated ___ 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] Noise and non-linear behaviour of ferrite transformers
On 7/20/2014 6:41 AM, John Miles wrote: I often find that when I use coaxial baluns to cut down on ground loop noise, I end up with more noise and interference than I started with. Not always, but often enough that I'm leery of them. Due to skin effect, most signal propagation in a coaxial cable takes place between the outer surface of the center conductor and the inner surface of the braid. Ideally, the outer surface of the braid just underneath the jacket will act like an equipotential shield to keep external EMI away from the signal path inside the cable. But that's really only true when the cable connects two devices in well-shielded enclosures that are themselves at a similar ground potential. When you "lift the ground" with a coaxial balun such as an FTB-1-1+, you can no longer pretend that the coax braid is at ground potential along its length. From an RF perspective the braid is floating at one end, which makes it an antenna. Just FWIW, the TADD-1 uses transformers to provide DC isolation, but the shield side of the coax goes to ground through a 0.1uF cap. The hope is that this reduces the issue that John's referring to (and which I've seen plenty of times using baluns). John ___ 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] GPS-III
"GPS-III" is the wrong term. You mean "block three spacecraft". The Air Force is buying 8 new satellites they are calling "block III" and they don't launch until at least 2016. If the current satellites are in good health they could delay the launch. If the past is a guide to the future the AirForce will eventually buy more advanced block III called "IIIa" or something.As a GPS users you'd never really know. Those numbers are contracting terms, not signal terms. The signals in question are already being transmitted by a few of the latter block II satellites. I think you can buy multi-frequency receivers. Remember GPS is not longer the only system. There are stelites from the US, Europe, Russia, China and Japan.Adding more more frequencies allows the receiver to detect multi path and makes it harder to jam but the timing is not greatly improved over say the M12. On Thu, Jul 24, 2014 at 12:14 AM, John C. Westmoreland, P.E. wrote: > Hello All, > > Does anyone know yet of any companies that are making GPS-III receiver > chip-sets/modules yet? > > Some web-sites on GPS-III: > > http://www.gps.gov/systems/gps/modernization/ > http://www.gps.gov/systems/gps/modernization/civilsignals/ > http://www.losangeles.af.mil/library/factsheets/factsheet.asp?id=18830 > > Regards, > John W. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] IMD in Broadband Transformers and be careful with that enamel insulation!
The data and tests presented in this source: http://www.cliftonlaboratories.com/imd_in_broadband_transformers.htm is a great resource on measured large-signal performance of binocular/toroidal transformers. One factor found that can really degrade IMD performance it turns out, is not the magnetic material itself, but but physical damage to enamel insulation in winding around corners of unfinished cores. My large signal usage of BN73-202's aka 287300202's, is that not only do they make great 160M transformers, I've also been putting them to use in multi-watt DC-to-DC step up converters! Similar to the Clifton labs test, in HV step-up usage I usually find the enamel insulation limits and/or winding-around-corner damage to be a much more prominent limitation on performance than the magnetics. Tim N3QE On Sat, Jul 19, 2014 at 6:09 PM, Attila Kinali wrote: > Hi, > > I'm currently looking at some way of breaking the ground loop between > several systems. The obvious idea would be to use transformers. I would > like to have some kind of rule of thumb to guess how much noise such > a transformer would add. But unfortunately i cannot find any theory > or measurements of this. Does anyone have some pointers to documents > on what kind of noise i could expect (type, and strength) and > what/how strong the non-linear behaviour of transformers would be? > > Thanks in advance > > Attila Kinali > > PS: although this started as something with a real application in mind, > i'm now interested in this as an endavour of its own. So all and any data, > theory or rule of thumb would be appreciated > > -- > I pity people who can't find laughter or at least some bit of amusement in > the little doings of the day. I believe I could find something ridiculous > even in the saddest moment, if necessary. It has nothing to do with being > superficial. It's a matter of joy in life. > -- Sophie Scholl > ___ > 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] GPS-III
Chris, I disagree only with your statement "as a GPS user you'd never know". As stated in one of John's references: The government is in the process of fielding three new signals designed for civilian use: L2C, L5, and L1C. The legacy civil signal, called L1 C/A or C/A at L1, will continue broadcasting in the future, for a total of four civil GPS signals. Users must upgrade their equipment to benefit from the new signals. These new signals (will) provide many advantages as seen by the civilian user, one of the most obvious is the ability to make real time IONO corrections on civilian receivers (currently restricted to P Code receivers). Also the new signal structures are more tolerant of both intended and unintended interference. Michael Raytheon Senior Fellow (retired) Navigation Systems On Thu, Jul 24, 2014 at 9:32 AM, Chris Albertson wrote: > "GPS-III" is the wrong term. You mean "block three spacecraft". > The Air Force is buying 8 new satellites they are calling "block III" > and they don't launch until at least 2016. If the current satellites > are in good health they could delay the launch. If the past is a > guide to the future the AirForce will eventually buy more advanced > block III called "IIIa" or something.As a GPS users you'd never > really know. Those numbers are contracting terms, not signal terms. > The signals in question are already being transmitted by a few of the > latter block II satellites. > > I think you can buy multi-frequency receivers. Remember GPS is not > longer the only system. There are stelites from the US, Europe, > Russia, China and Japan.Adding more more frequencies allows the > receiver to detect multi path and makes it harder to jam but the > timing is not greatly improved over say the M12. > > On Thu, Jul 24, 2014 at 12:14 AM, John C. Westmoreland, P.E. > wrote: > > Hello All, > > > > Does anyone know yet of any companies that are making GPS-III receiver > > chip-sets/modules yet? > > > > Some web-sites on GPS-III: > > > > http://www.gps.gov/systems/gps/modernization/ > > http://www.gps.gov/systems/gps/modernization/civilsignals/ > > http://www.losangeles.af.mil/library/factsheets/factsheet.asp?id=18830 > > > > Regards, > > John W. > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > -- > > Chris Albertson > Redondo Beach, California > ___ > time-nuts mailing list -- time-nuts@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] GPS-III
> I think you can buy multi-frequency receivers. Remember GPS is not longer > the only system. There are stelites from the US, Europe, Russia, China and > Japan.Adding more more frequencies allows the receiver to detect multi > path and makes it harder to jam but the timing is not greatly improved over > say the M12. The main source of error for GPS systems is the delay through the ionosphere. That delay is frequency dependent, so you can do a (much?) better job of correcting for that delay if you can get data from a satellite on 2 (or more) frequencies. I think GLONASS and Galileo use frequencies very close to GPS. The hardware in low cost GPS systems will work with no or minimal changes. It's mostly software to take advantage of the other satellites. But adding them to your bag of tricks won't help the ionospheric corrections. The extra satellites might help if you are in a place where you can't see many GPS satellites. -- 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.
Re: [time-nuts] Synergy-GPS SSR-6tru Problem Resolved
Hi Tom, I think that an offline conversation with Dusty Morris may have pointed out the root cause. The SSR-6tru board uses 3V logic, but the Motorola Oncore boards use 5V. So the Synergy M12 adapter has to do the level shifting to protect the receiver. It does this for input signals by using a voltage divider composed of a 4.7K resistor on top (for the 5V input) and a 6.8K resistor on the bottom to ground. The center tap of these two resistors goes to the receiver. Normally we would expect an open TTL pin to be a logic high. But, in this case, an open pin to the 4.7K resistor on top leaves the 6.8K resistor to act as a pull-down on the receiver's input pin. At least that's my speculation. I'm no EE. Bob From: Tom Van Baak To: Discussion of precise time and frequency measurement Sent: Thursday, July 24, 2014 12:02 AM Subject: Re: [time-nuts] Synergy-GPS SSR-6tru Problem Resolved Hi Bob, That's very good news. Thanks for following through on this issue. Newcomers to the list should know that unlike many of the large corporations in the T&F business, Synergy has been hobbyist and time-nuts friendly since the beginning. I know a couple of us bought our first GPS receivers from Synergy in the mid-1990's. This was in the early days of GPS where we used Tom Clark's TAC h/w and SHOWTIME.EXE s/w, in the same way we use Trimble's Thunderbolt h/w and Mark/John's HEATHER.EXE s/w today. /tvb - Original Message - From: "Bob Stewart" To: "Bob Stewart" ; "Discussion of precise time and frequency measurement" Sent: Wednesday, July 23, 2014 3:19 PM Subject: Re: [time-nuts] Synergy-GPS SSR-6tru Problem Resolved As a reminder, I received an SSR-6tru receiver from Synergy, along with their M12 adapter, which allows you to plug it into a slot for an Oncore GT+, UT+, or VP. I was unable to get the receiver to respond to any commands from the u-blox u-center software. After a lot of troubleshooting, I discovered that pin-5, the "DGPS IN" pin, must be brought to a logic level high in order for this assembly to work. If it's low, apparently anything going into the board on the Rx line is simply sent back out on the Tx line and not passed to the receiver. I've never owned a GT+ or a VP, so I wasn't aware that a logic high was needed on this pin. The UT+ works just fine with this pin not connected. 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] GPS-III
On eBay the RNY25A1 receiver module sells for $15 and $1 for shipping from Taiwan. Supposedly, it does GPS and Glonass. There is a link to a data sheet there as well. Might be interesting to play with one and compare the results. Stick it in a Tupperware box and nail it to a fence post. Al, k9si ___ 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] GPS-III
On Thu, 24 Jul 2014 10:30:07 -0700 Michael Perrett wrote: > The government is in the process of fielding three new signals designed for > civilian use: L2C, L5, and L1C. The legacy civil signal, called L1 C/A or > C/A at L1, will continue broadcasting in the future, for a total of four > civil GPS signals. Users must upgrade their equipment to benefit from the > new signals. Side note: L1C and L5 will only be available with Block III satellites. (ie. not before 201x, and even then only one or two satellites) L2C is available with Block IIM and IIF (13 satellites) > These new signals (will) provide many advantages as seen by the civilian > user, one of the most obvious is the ability to make real time IONO > corrections on civilian receivers (currently restricted to P Code > receivers). L1/L2 receivers already exist for civilan use and have been for some time. The P(Y) code does not need to be decoded for tracking the signal. This is known as "codless tracking". Attila Kinali -- I pity people who can't find laughter or at least some bit of amusement in the little doings of the day. I believe I could find something ridiculous even in the saddest moment, if necessary. It has nothing to do with being superficial. It's a matter of joy in life. -- Sophie Scholl ___ 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] GPS-III
Try http://navspark.mybigcommerce.com/. A bit more expensive ($25) but comes with a processor embedded. There is also a GPS+Beidou flavor. Edésio (sorry if duplicated) On Thu, Jul 24, 2014 at 05:10:35PM -0500, Al Wolfe wrote: >On eBay the RNY25A1 receiver module sells for $15 and $1 for > shipping from Taiwan. Supposedly, it does GPS and Glonass. There is > a link to a data sheet there as well. Might be interesting to play > with one and compare the results. Stick it in a Tupperware box and > nail it to a fence post. > > Al, k9si > > ___ > 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] GPS-III
Hi! Try http://navspark.mybigcommerce.com/. A bit more expensive ($25) but comes with a processor embedded. There is also a GPS+Beidou flavor. Edésio On Thu, Jul 24, 2014 at 05:10:35PM -0500, Al Wolfe wrote: >On eBay the RNY25A1 receiver module sells for $15 and $1 for > shipping from Taiwan. Supposedly, it does GPS and Glonass. There is > a link to a data sheet there as well. Might be interesting to play > with one and compare the results. Stick it in a Tupperware box and > nail it to a fence post. > > Al, k9si > > ___ > 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] GPS III
I have purchased about a dozen of these receivers (mostly the RS-232 version for $1 more). Reyax ships very fast. I get them in about 1 week. They work well, and are based upon the Ublox MAX-7C. They output independent GPS and Glonass NMEA messages and don't appear to merge the two systems in their navigation solutions. I have not done any testing of the 1PPS signal (which is brought out to the connector). -- On eBay the RNY25A1 receiver module sells for $15 ___ 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] RE : Re: GPS-III
Hello, While not really monolithic, I have found L1/L2 receivers (mostly for navigation, but also in timing flavor) rather well integrated, especially from Novatel and Javad. Sadly, their websites don't mention prices. Regards, Jean-Louis Oneto Envoyé depuis un mobile Samsung Message d'origine De : Attila Kinali Date :25/07/2014 00:31 (GMT+01:00) A : Discussion of precise time and frequency measurement Objet : Re: [time-nuts] GPS-III On Thu, 24 Jul 2014 10:30:07 -0700 Michael Perrett wrote: > The government is in the process of fielding three new signals designed for > civilian use: L2C, L5, and L1C. The legacy civil signal, called L1 C/A or > C/A at L1, will continue broadcasting in the future, for a total of four > civil GPS signals. Users must upgrade their equipment to benefit from the > new signals. Side note: L1C and L5 will only be available with Block III satellites. (ie. not before 201x, and even then only one or two satellites) L2C is available with Block IIM and IIF (13 satellites) > These new signals (will) provide many advantages as seen by the civilian > user, one of the most obvious is the ability to make real time IONO > corrections on civilian receivers (currently restricted to P Code > receivers). L1/L2 receivers already exist for civilan use and have been for some time. The P(Y) code does not need to be decoded for tracking the signal. This is known as "codless tracking". Attila Kinali -- I pity people who can't find laughter or at least some bit of amusement in the little doings of the day. I believe I could find something ridiculous even in the saddest moment, if necessary. It has nothing to do with being superficial. It's a matter of joy in life. -- Sophie Scholl ___ 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] RE : GPS III
The uBlox Max-7Q seems to be able to merge GPS and GLONASS for navigation, but the manual says explicitly that it must be avoided for timing, the delay of the PPS from GLONASS being not calibrated (plus various problems related to timescales). Regards, Jean-Louis Oneto Envoyé depuis un mobile Samsung Message d'origine De : Mark Sims Date :25/07/2014 01:15 (GMT+01:00) A : time-nuts@febo.com Objet : [time-nuts] GPS III I have purchased about a dozen of these receivers (mostly the RS-232 version for $1 more). Reyax ships very fast. I get them in about 1 week. They work well, and are based upon the Ublox MAX-7C. They output independent GPS and Glonass NMEA messages and don't appear to merge the two systems in their navigation solutions. I have not done any testing of the 1PPS signal (which is brought out to the connector). -- On eBay the RNY25A1 receiver module sells for $15 ___ 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] IMD in Broadband Transformers and be careful with that enamel insulation!
On 7/24/2014 9:37 AM, Tim Shoppa wrote: The data and tests presented in this source: http://www.cliftonlaboratories.com/imd_in_broadband_transformers.htm is a great resource on measured large-signal performance of binocular/toroidal transformers. One factor found that can really degrade IMD performance it turns out, is not the magnetic material itself, but but physical damage to enamel insulation in winding around corners of unfinished cores. My large signal usage of BN73-202's aka 287300202's, is that not only do they make great 160M transformers, I've also been putting them to use in multi-watt DC-to-DC step up converters! Similar to the Clifton labs test, in HV step-up usage I usually find the enamel insulation limits and/or winding-around-corner damage to be a much more prominent limitation on performance than the magnetics. Tim N3QE At HP, we once had a bad run of Mini Circuits transformers that would fail if used in a high impedance circuit that had different DC voltages on the windings. Turns out MCL left off the "Parylene" coating on the cores that protected the magnet wire insulation. Rick Karlquist N6RK ___ 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] GPS III
Hi If you go looking for them on the auction sites, the RYN25DI from Reyax is the search item for the RS-232 version. The RYN25AI is the search item for the not RS-232 version. Bob On Jul 24, 2014, at 7:15 PM, Mark Sims wrote: > I have purchased about a dozen of these receivers (mostly the RS-232 version > for $1 more). Reyax ships very fast. I get them in about 1 week. > They work well, and are based upon the Ublox MAX-7C. They output > independent GPS and Glonass NMEA messages and don't appear to merge the two > systems in their navigation solutions. I have not done any testing of the > 1PPS signal (which is brought out to the connector). > -- > On eBay the RNY25A1 receiver module sells for $15 > > ___ > 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] GPS III
How good is the built-in antenna? Do they work well in doors away from windows? The $15 price, low power and 2.5 meter CEP are attractive. They are 1/2 the price of something else I was looking at. I'd be using them for navigation, not timing. On Thu, Jul 24, 2014 at 5:57 PM, Bob Camp wrote: > Hi > > If you go looking for them on the auction sites, the RYN25DI from Reyax is > the search item for the RS-232 version. The RYN25AI is the search item for > the not RS-232 version. > > Bob > > On Jul 24, 2014, at 7:15 PM, Mark Sims wrote: > >> I have purchased about a dozen of these receivers (mostly the RS-232 version >> for $1 more). Reyax ships very fast. I get them in about 1 week. >> They work well, and are based upon the Ublox MAX-7C. They output >> independent GPS and Glonass NMEA messages and don't appear to merge the two >> systems in their navigation solutions. I have not done any testing of the >> 1PPS signal (which is brought out to the connector). >> -- >> On eBay the RNY25A1 receiver module sells for $15 >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS III
I received a little package with a GPS receiver + antenna from Gentleman [H6m] and I would like to tel him thank you very much 73 KJ6UHN Alex On 7/24/2014 5:57 PM, Bob Camp wrote: Hi If you go looking for them on the auction sites, the RYN25DI from Reyax is the search item for the RS-232 version. The RYN25AI is the search item for the not RS-232 version. Bob On Jul 24, 2014, at 7:15 PM, Mark Sims wrote: I have purchased about a dozen of these receivers (mostly the RS-232 version for $1 more). Reyax ships very fast. I get them in about 1 week. They work well, and are based upon the Ublox MAX-7C. They output independent GPS and Glonass NMEA messages and don't appear to merge the two systems in their navigation solutions. I have not done any testing of the 1PPS signal (which is brought out to the connector). -- On eBay the RNY25A1 receiver module sells for $15 ___ 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] GPS III
They seem to do pretty well. I have mine in devices sitting on my kitchen floor. It is downstairs in a stucco over wire mesh house. Nearest window/door is 20 feet away... and it is shaded by a stainless steel covered bridge to the guest house. Also lots of stainless in the kitchen... they are sandwiched in an isle between a pair large SubZero fridge/freezers one one side og the isle and a center island clad in stainless.I can take them a few minutes to acquire down there and they occasionally lose lock (mainly late at night when the geometry/coverage is bad). I think the NEO-6M receivers may be a tiny bit better about acquiring signals. - How good is the built-in antenna? Do they work well in doors away from windows? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
