[gps-talkusers] Re: luetooth receiver not detected?

Gavin,

Well, from doing a google search on the  Globalsat
bt338, I think I know why the bluetooth reciever appears to be dropping at 
pedestrian speeds and doing just fine at vehicular speeds.

Since the receiver is using the SirfstarIII chipset which is a chipset that 
is very sensative, the receiver will pick up signals that are bouncing off 
of walls, from buildings in urban areas, but also indoors.  Although this 
seems like a good idea, the downside of this is that heading information may 
be throw off due to multi-path (you may be heading north, but since the 
receiver is picking up faulty signals, it may report that you are heading 
south). Also, with the SirfstarIII chipset you may experience what is known 
as "drift" with this you may be standing in one location for a few minutes, 
but if you check the pedometer with the b command, it may report that you 
have gone a quarter of a mile, but in reality you haven't moved a foot.

Sirfstar had a resolution for the multi-path issue and the drift issue that 
chipset was experiencing. Their resolution was to enable "static 
navigation," this is a feature of the  chipset that will freeze your 
position when moving slower than 2.5 mph or 4 kmh. that freezes your 
position when you are moving slower than 4 km/h . Position changes will only 
be registered when the difference exceeds 165 feet or 50 meters. As
a result when you walk slowly your position seems to be frozen and it 
updates only every once in a while.

The reciever appears to be freezing when at pedestrian speeds resulting in 
the gps program no longer detecting the receiver, thus you getting the 
message "bluetooth receiver not detected. press v for virtual"

I hope this answers your question. The above was taken from: 
http://www.pocketgpsworld.com/bt338.php

I took the information from the website and summarized it as I thoght the 
article was quite lenghty and there were portions that didn't pertain to the 
issue you were experiencing.

It also appears that their latest batch are being shipped with the "static 
navigation" turned off, so the receiver won't freeze at speeds below 2.5 mph 
or 4 kmh.

If you are looking for a receiver I would recommend the Holux GPSlim236, I 
would recommend purchasing it from Sendero Group as they have worked with 
the manufactures to have the best settings configured to work with the 
Sendero GPS. If you purchase the reciever from Sendero they have all of 
their receivers enabled with waas by default.

Kevin




good thing


----- Original Message ----- 
From: "gavin atkins" <gavin.atkins@xxxxxxxxxx>
To: <gps-talkusers@xxxxxxxxxxxxx>
Sent: Monday, June 18, 2007 1:14 PM
Subject: [gps-talkusers] luetooth receiver not detected?


> Gavin Atkins,
> tel: M 07702:051633,
> Email: gavin.atkins@xxxxxxxxxx
>
>  Support Guide Dogs by using MagicTaxis FREE internet search engine and 
> email.
> MagicTaxi gives 50 % of its advertising revenue to charity.
> For more information see wwwddguidedogsddorgdduk/magictaxiHello list
>
> I'm experiencing some very strange behaviour with my Bluetooth receiver.
>
> About three months ago I bought a Bluetooth receiver.
>
> I spoke to Tom Burton at Humanware UK who told me that they are 
> recommending the Royaltek and the Globalsat bt338.
>
> Because the waas is enabled in the Globalsat bt338 I went for that one.
>
> I am very pleased with it I get accuracy of about 19-28ft usually and 
> sometimes it says waas! but its behaving strangely.
>
> I keep getting the message "Bluetooth receiver not detected" and can only 
> get it going again by re-activating the active sync in the connectivity 
> menu but this will only work for about 5 minutes then I have to do the 
> same thing again.
>
> But when using my bn gps with the same receiver while travelling by car I 
> have never lost the connection with the bt338 receiver, but always when 
> walking with my Guide dog and my leather shoulder bag with my piano tuning 
> tools on my back.
>
> What can be happening, I've been trying to work it out without success any 
> Ideas?
>
> Gavin
>
> Gavin Atkins,
> tel: M 07702:051633,
> Email:gavin.atkins@xxxxxxxxxx
>
>  Support Guide Dogs by using MagicTaxis FREE internet search engine and 
> email.
> MagicTaxi gives 50 % of its advertising revenue to charity.
> For more information see wwwddguidedogsddorgdduk/magictaxi
>

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