[Scan-DC] Cell Phone Frequencies

[Marcel]

"Bennett, Steven" wrote:

> On a related note, I've been wondering about the hands-free cell phone thing
> that is always for sale on tv.  It broadcasts the phone call via a certain
> FM station through your car radio.  I'm not going to pretend I know much
> about electrical stuff, but doesn't that require the hookup to re-bradcast
> the phone call or at least the driver's end via the radio freq?  If I am
> totally wrong, feel free to tell me, thanks.

The Unit is a one-way device. It only transmits the callers voice over the car radio using
a low power FM transmitter on unsed freqs (around 88.xx and 106.xx Mhz). The drivers NON-
Amplified voice is picked-up by the phones built in mic. So need less to say you may hear
the caller well but I'm sure you will sound distant to the caller.


>
>
> -----Original Message-----
> From: William D. Rossiter III [mailto:RadioGuy101@comcast.net]
> Sent: Thursday, January 02, 2003 2:30 PM
> To: Scan-DC (E-mail)
> Subject: [Scan-DC] Cell Phone Frequencies
>
> These new cell phones that are starting to come around that allow the owner
> to send and recieve photos/images, what frequencies are these photos sent
> at?  Can a wideband reciever with an image option pick these up?

They are transmitted over the carriers network. It could be 800 Mhz or 1900 Mhz.
The problem is the digital picture is transmitted using the carriers air-interface (i.e.
Sprint 1900 Mhz CDMA,
Cingular 800 mhz, 1900 Mhz TDMA / EDGE /GPRS) decoding the interface would be the 1st
challange (possible but expensive) and then decoding the picture format (jpg, mpeg. ????)
within the air-interface. While it is possible a simple wideband reciever just won't cut
it.