Thanks Adam, Richard, Brendan, for your helpful inputs.

I'll try Richard's superhet circuit.

> The first thing I would do, given your low power requirements, is check
> out the rfPIC series.  I've never used them because of their low TX
> power capabilities (somewhere around 2 dbm if I remember correctly), but
> they're probably your best bet.
>
This did look the most tempting, but I thoght that Microchip just have a
transmitter in the RF-PIC range (RF12C509 AG/AF). If they do have a
receiver, and it is available now, that would be the simplest (and most
compact) solution.

> You're right, the TX circuits are much simpler.  For a possible RX
> solution you might want to check out MICRF001BM.  I haven't priced them
> in a while but I think they're somewhere around $5 in low quanities
> (once again, not sure though).

A great product, at a great price; I am checking up the availabilty of
Micrel products here in India.

>
> Is this a one-way thing or do you need transceivers?

It is a one-way app, I do not need transcievers. The transmitter would be
battery operated (in a key-fob), and the receiver would work off a vehicle's
battery.



> Regards,
> Adam Smith
>
> > -----Original Message-----
> > From: adam-request@viratech.com [mailto:adam-request@viratech.com] On
> > Behalf Of Anand Dhuru
> > Sent: Monday, June 24, 2002 9:01 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [OT]: RF Transmitter, Receiver
> >
> > Folks, I need a transmitter, receiver to integrate in a product, where
> the
> > range required is minimal (not more that 10 feet). Also, the bandwidth
> > requirement is exremely minimal; a few bytes to be sent every few
> minutes.
> >
> > The criticality is more to do with the economics involved. I cant
> > therefore think of using pre-assembled rf modules like the Ming
> series.
> >
> > Considering the modest range and bandwidth requirements, I am tempted
> to
> > use my own receiver and transmitter, integrated on the PIC PCB, for
> the
> > project.
> >
> > Are there any 300 MHz or 418 MHz circuits on the internet to do this?
> I
> > have the circuit for the transmitter, which is extremely simple in
> design,
> > and I'm hoping someone can help with the receiver schematic.
> >
> > Thanks and regards,
> >
> > Anand Dhuru
> >
> > --
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>
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