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| T O P I C R E V I E W |
| gpspassion |
Posted - 25 nov. 2008 : 02:05:45
 Transystem have just launched the iBlue 747A+ based on the new MTK v2 (MTK 3329) GPS chipset rated at -165dBm and previously used on the Qstarz Nano BT-Q1300 datalogger.
While the i747A+ uses the solid design that we discovered in 2006 on the iBlue 737 it is the first GPS datalogger to offer AGPS assistance for faster GPS acquisition. It is of the Internet AGPS variety with a file good for five days being downloaded over the internet and then uploaded to the device. This should be especially useful for a datalogger that tends to get placed in difficult areas like backpack pockets.
The iBlue 747A+ is already available at Semsons for $80 with 10% off for GpsPasSion Club members and a test unit should soon be heading out to the "GpsPasSion Labs" so stay tuned for some detailed performance testing in the field.
Questions, comments ? |
| 15 L A T E S T R E P L I E S (Newest First) |
| geoair |
Posted - 02 avr. 2011 : 17:20:35
Hi,
It seems mine still has Bluetooth activated when logging.
I just thought/hoped there was a way to disable BT connection via software instruction.
Thanks anyhow.
Best regards.
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| gpspassion |
Posted - 31 mars 2011 : 00:10:22
There were several versions but I think that Bluetooth was off in the datalogger mode on some of them. If yours doesn't do that not much you can do about it I'm afraid. |
| geoair |
Posted - 30 mars 2011 : 12:23:10
Hi all,
Does anyone know some way to disable the Bluetooth connection on the Iblue 747a+?
I'm asking because i'll do some flying and would like to log my flights but would like to disable the Bluetooth to minimize any electronic interference.
Best regards. |
| geoair |
Posted - 03 août 2010 : 13:42:07
Hi all,
Suddenly my Iblue 747a+ stopped conecting via usb no any computer I use. I even tried leaving the baterry off for more then a week to see if it would resset for itself...
Any suggestions? |
| vasyapupkin1000 |
Posted - 14 juil. 2010 : 12:00:42
I have a i-Blue 747A+ which I'm struggling with for a few days already. I want to use it as a GPS data logger for racing, i.e. have it log GPS locations for an hour or so of racing, than download the data to a PC and process it with something like RaceChrono.
I found tons of article on how to use it as a simple GPS, i.e. in real-time, but nothing, literally nothing that explains how to use it as a data logger. Transystem manual itself does not explain it either. GpsView software that comes with 747A+ does not have this option... I'm lost.
Any help would be greatly appreciated. |
| geoair |
Posted - 23 sept. 2009 : 23:28:19
HI,
I own an Iblue 747a+ and need to factory reset it.
Whats the best way to do it?
Thanks in advanced. |
| claudegps8 |
Posted - 11 sept. 2009 : 15:57:41
Interesting, thanks 4river.
I'm going to give it a try |
| 4river |
Posted - 11 sept. 2009 : 14:47:43
My Windos utility also corrects the geoid by using 1'x1' and 2.5'X2.5' of National Geospatial-Intelligence Agency(NGA) grid data.
http://homepage2.nifty.com/k8/gps/ |
| mdeweerd |
Posted - 10 sept. 2009 : 12:18:42
The iBlue 747 A+ logs the heigth with respect to the WGS84 ellipsoid.
This can not be changed.
Because was interested in height with respect to MSL (mean sea level), I made an implementation in my application BT747.
BT747 is capable of making adjustments to the height to find the MSL value and writes it out in the output file.
So my hint is to use BT747.
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| claudegps8 |
Posted - 10 sept. 2009 : 12:08:16
Logging correct MSL altitude with 747A+ instead of HAE
Hi all, I'm trying to log altitude + geoidal separation with my 747A+.
Seems that the GPS logs only the altitude, but the altitude correction is not logged, nor applied to the logged altitude. So this information is basically lost (of course it can be recovered, as the correction are function of the lat/lon... ) and the altitude is not logged as MSL but HAE (above ellipsoid - where I am the error is about 50 meters)
Any hint?
I also checked the datalogging format, but only altitude is present.
www.claudegps.altervista.org |
| apmon |
Posted - 04 sept. 2009 : 12:40:22
Thanks for the comments. I have finally gotten around to doing another comparison, this time with the AGPS data expired, so hopefully it wasn't using it any more. (mdeweerd, do you have some links to those forum reports about AGPS?) I also recorded the raw NMEA data to see if there is any other indications what might be going wrong such as signal strength.
Then new comparison is at http://gpsmid.sourceforge.net/misc/GPS_comparison3.png with the blueish trace being the BT747A+ and the orange one the SiRFIII.
The raw logs can be found at http://gpsmid.sourceforge.net/misc/rawGpsLog2009-09-04_SIRFIII.txt and http://gpsmid.sourceforge.net/misc/rawGpsLog2009-09-04_BT747A.txt
Both receivers have a lot of trouble with this route and show substantial jitter around the true path (probably particularly when I squeeze through between two double decker busses on my bike and there is thus no clear view of the sky), but I would still say that the 747A+ does a worse job at catching back up again when the conditions get better again and partly has a largish offset to the true path. |
| mdeweerd |
Posted - 23 août 2009 : 23:19:24
I did not look at your logs, but I read on a German forum that some people had trouble when they were using AGPS. As far as I understood, this was regardless of the SW used to upload the AGPS data to the device.
I got an iBlue 747 A+ in July and used it on vacation. I am quite happy with the results.
Upon reception of the device I did try the AGPS feature of course to notice the same problems as mentioned on the German site - fix problems on regular intervals. Therefore I no longer use AGPS. The iBlue 747 A+ has a very fast fix without it anyway and it does not really have to be in 'open sky' - it gets a fix quite fast in-house. Once fixed it has valid satellite data for the next four hours and this will get updated when it has GPS reception - so no real need for AGPS data if you have a good enough reception on regular intervals (it is best not to move when getting the initial fix, although the A+ does better than its predecessor when moving). |
| apmon |
Posted - 19 août 2009 : 19:29:38
Yes, all of these recordings were done simultaneous while cycling (so at a maximum speed of about 20 km/h) with all of the GPS in the front pocket of my backpack, so not pointing upwards.
I believe the AGPS data was upto date (within the 6 days it claims it is valid for). For those tracks, if I remember correctly, the number of satellites the 747A+ used was mostly one or two more than for my SiRFIII and normally between 7 and 11. I will need to check the actual signal strength and can do another comparison, this time recording the full NMEA log and posting it. During those recordings, I believe SBAS (EGNOS) was enabled for the 747A+, but disabling didn't seem to change anything with respect to accuracy.
According to BT747 the firmware version is AXN_1.30-B_1.3_C01 (TSI_747A+), model number is 000F and flashinfo is 1C20161C (EON, 4MB)
If there is anything I can do to improve the accuracy, I would be very happy, so any help in figuring out what might be going wrong would me much appreciated.
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| gpspassion |
Posted - 19 août 2009 : 01:28:09
Welcome to the forums and thanks for sharing these comparisons. All the recordings were done simultaneously I assume ?
In any case something seems to be wrong with your 747A+, even my Q1300/MTKv2 with its tiny antenna performed better, see the article on the portal. You could look at the signal levels in the NMEA logs to see if the problem lies there, could be an outdated AGPS file too if you downloaded one before setting out. |
| apmon |
Posted - 19 août 2009 : 01:21:50
Hi,
I have recently bought an i747A+ but must admit that I am somewhat disappointed with its performance so far, or at least not particularly impressed. I have done a few comparisons with my other GPS I have and would probably say it performs worse than my old SiRFIII one. My impression is that it sometimes behaves somewhat strangely when going around corners of tall buildings.
I have also had problems with the i747A+ bluetooth not being particularly stable when connecting to any of my phones. It sometimes does not update for a few seconds, or even looses bluetooth connection completely. Something I haven't so far seen with any of my other GPS.
But I will post two comparisons here for others to judge or comment on what they think.
The first comparison ( http://gpsmid.sourceforge.net/GPS_comparison.png ) is done straight through central London and its tall glass-metallic buildings. It compares 4 GPS. A "Jentro BT-GPS 8" (SiRFIII), A "HOLOX" (SkyTraq 5), i747A+ (MTK II) and a built-in gps from a Nokia 6220c phone. The colours of the traces are light blue, green, purple and orange respectively.
The second comparison ( http://gpsmid.sourceforge.net/GPS_comparison2.png ) is done slightly out of the center of London, this time not including the Nokia phone GPS. (light blue - SiRFIII, orange - SkyTraq, green MTK II)
All traces were recorded connecting the GPS to a phone and recording using GpsMid set to log every 5 meters. Traces are overlayed onto OpenStreetMap.org maps. |
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