I beleive the caller ID demod chips will fit the bill
for the receiver there is probably a corresponding
transmitter IC.

Norman

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Mike Keitz
> Sent: Saturday, April 04, 1998 2:44 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: TCM 3105 still available?
>
>
> On Sat, 4 Apr 1998 23:18:35 +0200 Thomas Schleusener
> <Thomas.Schleusener@T-ONLINE.DE> writes:
> >I need a radio modem to transmit data with  a 10mW FM rf-modul at 1200
> >Baud.
>
> If you are able to specify the transmission method and control the radio
> hardware design/connection, use direct FSK.  The cost approaches zero and
> the performance better approaches ideal.
>
> >I want to use the TCM3105, because there I have some
> >applications
> >and it4s a cheap solution.
>
> The 3105 is not a good idea for new design.  TI has tried to discontinue
> it several times.  If you must send 202 modem tones, consider a caller-ID
> receiver chip such as the Motorola MC145447 for the demodulator and
> implement the modulator directly from the PIC using any of several
> sine-wave generator techniques.
>
>
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