[Loadstone] iblue receivers questions

Kevin Chao kevinchao89 at gmail.com
Thu Oct 29 22:10:57 GMT 2009

Yes, AGPS just decreases TTFF. It is suppose to be something like from 30
seconds to 5 seconds on receivers that support AGPS. Anyone got it working?


Twitter: KevinChao89 
Skype: Kevin.Chao89 

> -----Original Message-----
> From: loadstone-bounces at loadstone-gps.com [mailto:loadstone-
> bounces at loadstone-gps.com] On Behalf Of Shawn Kirkpatrick
> Sent: Thursday, October 29, 2009 3:00 PM
> To: General discussion pertaining to the Loadstone GPS program
> Subject: Re: [Loadstone] iblue receivers questions
> The 10 meter difference you're seeing is probably due to differences in
> the
> receivers. Either different chipsets, firmware processing, or even the
> radio
> receivers used.
> The agps is only to help the receiver get first fix as far as I know. I
> don't think it does anything once you actually have a signal. Whether
> this
> is worth doing probably depends on how long your receiver normally
> takes to
> get a fix.
> Loadstone won't give any indication of agps, the receiver doesn't seem
> to
> send anything different so there's nothing to report. The differential
> fix
> is if you're getting the waas/egnos signal, nothing to do with agps.
> On Thu, 29 Oct 2009, Kerry Hoath wrote:
> > I have been a loadstone user since December 2006 however the answers
> to the following questions still escape me.
> >
> > Firstly, I notice a 10 meter or so difference between a sedio 2010
> and a globalsat bt338 verses the sedio 2110.
> > Anyone else seen this? Anyone want to crunch some logs if I can
> provide them? points made on the globalsat and the 2010 are 10 meters
> out when viewed on other receivers I have the sedio 2110, a deluo
> datalogger using mtk chipset and an iblue 737a+ and 747a+.
> >
> >
> > I have 3 iblue receivers, 2 737a+ units and a 747 datalogger.
> > Manual claims you can load differential data to the receiver to
> shorten time to first fix.
> > Is this worth doing? I assume it is done by using gpsview and hitting
> query update although not sure which buttons to hit in what order.
> > Does gps have to have a fix for this to work? This is possible I can
> take a netbook outside and have a fix and get access to the net.
> >
> > Should loadstone show any difference i.e. differential fix, and is
> uploading ephemeris data even worth the time?
> >
> > Iblue receivers seem to show more satelites more often however they
> don't seem to hold on as long as the SiRf3 units I have if they loose a
> signal it's just gone so you often oscillate between no signal and a
> fix rapidly at times. Anyone else seen this?
> >
> > Any other hints on the inblue receivers welcome.
> > Not sure if I have just done my money on receivers that aren't cool
> or whether the agps is worth having.
> > Regards, Kerry.
> >
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