It is a good idea. There are also other IC's to convert RS232 to FSK
modulation. One of them is made from RADIOMETRIX for this purpose only and
it's a very powerful one, with receive and transit buffer and meny other
great features, but in my project dimensions and cost were the main factors
for my choice. Writting code is cheaper and smaller than those IC's.

Mircea Chiriciuc
EMCO INVEST

----- Original Message -----
From: "Andrei B." <andrixnet@YAHOO.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, May 21, 2002 12:40 PM
Subject: Re: [PIC]:RF transmission


> --- Mircea Chiriciuc <sascha@GO.RO> wrote:
> > The bad news for you should be that it
> > is not
> > recommended to use the USART for transmitting on RF because of the
> > asimetry
> > af the data. (a 0 byte will be 0V on the transmitters input for 8time
> > slots
> > and a 255byte will be 5V for 8time slots) and that causes the data
> > shaper to
> > decalibrate and that will increase the error rate a lot.
>
> Keeping the RS323 serial routines, one could do something else: (an
> additional IC is acceptable)
>
> Use the serial-to-IR transceiver TOIM3232 or TOIM4232 from Vishay
> Telefunken.
>
> It converts the serial data into pulses adequate for IR transmission,
> and it should also be adequate for RF.
>
>
>
> =====
> ing. Andrei Boros
> Centrul pt. Tehnologia Informatiei
> Societatea Romana de Radiodifuziune
>
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