[Loadstone] MTK chipset, was Re: royaltek rbt 2110

Rob Melchers rob at loadstone-gps.com
Sat Jun 23 21:26:54 BST 2007

Hi Kevin,

Could you, without revieling the mysteries around this new super receiver, 
explain waht has caused this superior suppression of signals distorted by 
multi path reflection? In theory, MPR is responsible for a plus minus 3 
meters degradation of accuracy. To say that the MTK chipset drastically 
improves on distortion by MPR, means it should be eliminated completely. 
Propagation in the ionospheric layers still is the major cause of 
inaccuracy in GPS. I don't think the folks at MTK have found a way to 
prevent sporadic E-layer reflection in the L1 band, reduced the effects of 
magnetic distortion in the S-layer and know how to controll sunspots. The 
results as I have seen them so far from receivers using the MTK chipset 
show no superiorty over existing receivers. What I have seen is that a 
predictive averaging model outpputs a smooth track at speeds of over 4 KpH 
and that reducing a number of DOP masks results in a higher satellite 
count. All this fits in nicely in the marketting efforts that MTK are using 
to get their fair share in the receiver market. However, I'd rather wait 
until I have something more solid to go on before committing to 'the latest 
and therefore the best'.


At 6/23/2007, you wrote:
>Well, the Holux M-1000 is using the MTK chipset which has all of the
>benefits of the SirfStar III chipset but has many  improvements. I am
>currently testing out a reciever using hte MTK chipset, but since this
>reciever is still under testing; I cannot mention its name. But, I can say
>that the MTK chipset has fixed the multi-path issue dramatically that was
>faced in using the SIrfStarIII chipsets. The sensativity of the receiver has
>also been greatly improved, it receives waas about 80% of the time, and this
>is a true waas reporting in the US as it is easier to pinpoint locations
>within a 3 meter radius. The MTK chipset also consumes less battery power
>than the SirfStarIII chipsets, this is why the Holux M-1000 is able to
>receive over 17 hours of battery life with a 1000 mAh battery.    If the
>reciever were using an auto on/off feature, the battery life would probably
>reach close to 30 hours
>----- Original Message -----
>From: "Cathomas Jürg" <Juerg.Cathomas at sbv-fsa.ch>
>To: <loadstone at loadstone-gps.com>
>Sent: Saturday, June 23, 2007 12:21 AM
>Subject: Re: [Loadstone] royaltek rbt 2110
> > Hi Hasan,
> > ; And it is more sensitive than a typical SiRf3 Unit.
> > That's interesting. Please let us know whether the real accuracy, not only
> > the theoretical accuracy is better.
> > In cities, according to my experience, the problem of unreliable
> > indications due to reflexion is a much bigger problem than the number of
> > satellites.
> > Kind regards
> > Jürg
> >
> >
> >
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> >
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