External antenna for the new TomTom Go 540, Go 740 & Go

[g4ens]

Thanks Phil.

I change my Qstarz settings for vehicle and walking when possible. But carrying a Windows PC is not always possible!!

I had decided that the Qstarz used it's internal computer to improve accuracy. Remember when 'lock to road' appeared, folk were saying that their GPSr was more accurate, when it was actually the software corrupting the GPS position.

I thought from my experiences with my Qstarz, that the software did averaging to 'forecast' the next position plot. Hence the over shoot.

As for long-term logging, my Psion PC software would do this, which with SA was very useful. When the Psion computer's batteries lasted longer than the GPSr's batteries, that was good.

On that subject GARtrip www.gartrip.de will average the same waypoints that are merged in later usages.

I'm now retired and want to be able to keep a daily track log and manage new waypoints. I also want a good navigating GPSr.

[g4ens]

Thanks Mike,

I was not aware of changes regarding GPS signal re-rads, although generally for whole buildings I was.

The output power is generally very low, requiring the re-rad to be only a few cm. away from the GPSr. This would rule out more that one GPSr using a single re-rad.

Providing the radiated signal did not extend outside of the vehicle, there would be no problem and I had thought of enclosing the GPSrs in a metal shield anyway. Some GPSrs radiate a signal that I can hear on my ham VHF radio as noise.

If I do decide I need one and can't buy one then making one should (for a radio ham) be easy and I'll keep it's output enclosed.

Many thanks for the comment.

[MrT]

Expansys and Total PDA still sell GPS re-radiators.
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Drivelux

[mikealder]

I wonder if the ones they have on sale work with L1 & L2 signals - I might order one in the morning to see if they will actually sell them, the actual OFCOM statement can be read on This Page, although this is yet another classic stupid law, the low power levels involved whilst transmitting within what is effectively a Faraday cage that is moving makes detection rather difficult (read 99,9%) impossible by the authorities - Mike

[MrT]

I am sure that somewhere within the act there are set levels of transmission power below which something is not considered to be transmitting, whatever its frequency. As these GPS re-rediating devices have a useable transmission distance of 10cm, unlike the in-building devices, I believe they would be inside the law.

After all if you inductively coupled (transformer) something you are effectively transmitting, even if it is only for a fraction of a millimeter.
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Drivelux

[IanS100]

Before Xmas my 520 started itself up & started to give me route directions whilst zipped in it's case & hidden away in the armrest of my car. I've no idea how it was getting reception through the steel roof but it says a great deal for the TomTom chipset.

[Darren]

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