I have a mp3 file (3.074.051 bytes) that when I send from my Pocket to
the PC I get only a 30KB/s rate. It take 1 min and 48 second to
transfer the file.
The same file now formw the pc to the pocket take 6 minutes, it has a
12 KB/s rate. Why is that?

If i buy a USB/Bluetooth adaptor 2.0 is gointo to speed up the PC ->
Pocket transfer?

Another thing is when I put the PPC next to the Bluetooth dongle it
speeds up to 30 KB/s PC -> Pocket.

Thanks

The general concensus is that for transferring large files, it's much
better to buy a usb 2.0 "card reader" and use that to transfer.

Beverly Howard [MS MVP-Mobile Devices]

"Alberto" <alberto.ufba@gmail.com> wrote in message
news:1156776959.836750.33170@p79g2000cwp.googlegro ups.com...
>I have a mp3 file (3.074.051 bytes) that when I send from my Pocket to
> the PC I get only a 30KB/s rate. It take 1 min and 48 second to
> transfer the file.
> The same file now formw the pc to the pocket take 6 minutes, it has a
> 12 KB/s rate. Why is that?
>
> If i buy a USB/Bluetooth adaptor 2.0 is gointo to speed up the PC ->
> Pocket transfer?
>
> Another thing is when I put the PPC next to the Bluetooth dongle it
> speeds up to 30 KB/s PC -> Pocket.
>
> Thanks
>

Transfer speeds for both WiFi and Bluetooth depend on a LOT of factors. One
of them is the signal strength - which determines your signal-to-noise
ratio. This is same for any wireless transmission medium - your mobile
phone, even the telly in your house.

The closer your TX/RX devices are, then the better your signal strength is
going to be and the faster you will therefore be able to transfer data.
You can "hear" this with an AM radio station ...when you're close the sound
is nice and clear and may even be in stereo. The further you move away from
the transmitter, the lower your signal strength is going to get, and the
harder it will be for your receiver to discriminate usable signal from the
background noise. Consequently, stereo will drop out, you'll start to hear
static, and finally nothing at all except static.
The reason I used an AM radio analogy is that FM will simply "mute" if s/n
ratio isn't good enough, and digital mobile phones will "drop" the call for
same reason so they don't make a good illustration.

Clear as mud?

--Craig.



--
Posted via a free Usenet account from http://www.teranews.com

CraigB wrote:

> Clear as mud?

no matter how far away the speed of the signal is the speed of light or
something very close [correct me if I'm wrong)

a less reliable signal means more packets of data must be resent, thats
why it gets slower.


--
Marc
See http://www.imarc.co.uk/ for contact information.

>> no matter how far away the speed of the signal is the speed of light
or something very close <<

The data speed factor is the integrity of the signal, not the speed of
the signal.

I know that wifi has the throughput dropoff with distance, and it sounds
reasonable for it to apply to bt as well although it might not simply
because the base speed is low by comparison.

Beverly Howard [MS MVP-Mobile Devices]

The bigger the distance, the lower the transfer rate.

BT 2.0 won't speed up your connection - it'll stay at 723 kbps (at most).

--


--
Werner "Menneisyys" Ruotsalainen - Microsoft MVP - Windows - Mobile Devices
Please see the Pocket PC Mag Expert Blog (including mine) at
http://www.pocketpcmag.com/blogs/ - you will definitely like it.


"Alberto" <alberto.ufba@gmail.com> wrote in message
news:1156776959.836750.33170@p79g2000cwp.googlegro ups.com...
>I have a mp3 file (3.074.051 bytes) that when I send from my Pocket to
> the PC I get only a 30KB/s rate. It take 1 min and 48 second to
> transfer the file.
> The same file now formw the pc to the pocket take 6 minutes, it has a
> 12 KB/s rate. Why is that?
>
> If i buy a USB/Bluetooth adaptor 2.0 is gointo to speed up the PC ->
> Pocket transfer?
>
> Another thing is when I put the PPC next to the Bluetooth dongle it
> speeds up to 30 KB/s PC -> Pocket.
>
> Thanks
>

Having a USB 2.0 Bluetooth adapter does not speed up the Bluetooth
transfer rate. The limiting factor there is the Bluetooth standard.

There are Bluetooth standards (see
http://bluetooth.com/Bluetooth/Learn/Basics/)
The common, and older version 1.2 which has a rated 1Mbps rate, which
seems that it translates, because of the communications overhead, to
721kbps.

And now there is the newer, and not common yet, version Bluetooth 2.0
(or EDR "Enhanced Data Rate) (do not confuse USB 2.0 with Bluetooth 2.0
- different standards) which has 3x the speed of Bluetooth 1.2.

BT v2.0 is backward compatible with BT v1.2, since it works in the same
frequency spectrum.

Something else I learned from the Bluetooth wedsite, there are 3
classes of power for Bluetooth, which affect the range, naturally.

The common, Class 2, it typically for devices up to 10 meters (about 30
feet),
but there also is a much lower power Class 3 for ranges up to about 1
meter (about 3 feet),
and a Class 1 power which could communicate with devices up to 100
meters (about 300 feet).