Unless you have a very low data rate you might want to try around 100 MHz. You can use a simple MPF102 circuit to transmit and Phillips and I think National make receiver chips both AM and FM. If you use AM you will need to be concerned with ambient EM noise that would not affect FM. ----- Original Message ----- From: "Richard Prosser" To: "Microcontroller discussion list - Public." Sent: Saturday, March 10, 2007 2:12 AM Subject: Re: [EE] simple AM radio for data transmission > Look at super-regenerative receivers. > They can be a bit tricky to get going however. Also, 1MHz is a bit > low , you might want to head into the 10's of MHz region. > > Therwise, for short range, you might be able to get a TRF receiver > working for simple on-off keying & using a highish speed opamp. > > RP > > On 10/03/07, Andrei Yurkevich wrote: >> Hi, >> >> I'm working on a simple RF data communication system that would allow >> one-way radio communication between two PICs, some kind of serial- >> over-RF. I'm a total dummy when it comes to analog circuitry, so I >> definitely need some advice here... >> Currently, I've got a 1MHz carrier generator built with a 74hc14 and >> a quartz xtal, that is AM-modulated with an output from PIC - logic >> high is full amplitude, logic low is something about 1/3, data rate >> is going to be about 100~200 bits/sec. I can perfectly hear this >> transmitter when I tune in with my stereo in another room :) >> The question is what kind of a receiver should I use. Can someone >> point me to a suitable design that is easy to understand/implement in >> order to achieve this goal? Maybe some "classic" circuit that can be >> easily modified to receive such kind of data transmission? And yes, >> the receiver is going to be mobile so I need a solution that is >> rather compact and portable. >> >> cheers, >> Andrei >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist