reid@hplvec.LVLD.HP.COM (Reid Trimble) (03/28/91)
I think this might be what you had in mind: From kellym@ether.UUCP Tue Mar 19 10:38:35 1991 Relay-Version: version Notes 2.8.4 1990/05/09; site hplvec.LVLD.HP.COM From: kellym@ether.UUCP (Kelly M McArthur) Date: Tue, 19 Mar 1991 17:38:35 GMT Date-Received: Fri, 22 Mar 1991 02:06:54 GMT Subject: Re: FM transmitter/receiver chips Message-ID: <1727@ether.UUCP> Organization: HALF, Beaverton, OR Path: hplvec!hpfcso!hplabs!ucbvax!ucsd!swrinde!zaphod.mps.ohio-state.edu!mips!cs.uoregon.edu!ns.uoregon.edu!milton!uw-beaver!zephyr.ens.tek.com!tektronix!sequent!ether!kellym Newsgroups: sci.electronics References: <1991Mar14.025500.11882@s1.msi.umn.edu> Reply-To: kellym@ether.UUCP (Kelly M McArthur) Keywords: transmitter, receiver, FM, I.C. Lines: 25 In article ... tomv@s1.msi.umn.edu (Tom Varghese) writes: > >I am looking for an simple, cheap FM transmitter/receiver circuits to use >as a medium for digital data transmision over a short range (~100 yards).... >I was wondering if there are any single chip solutions for this. Motorola's MC2833 might be useful to you. It is a single-chip FM transmitter with an audio input you could use for FSK, and a built-in microphone preamp you can loop back into the audio input. In addition, if you call the Motorola folks in Phoenix, they'll cheerfully send you a little evaluation PCB you build up a test circuit on (or at least they did for me). The part is found in the "Linear and Interface Integrated Circuits" book. The data book lists values of caps and coils to operate this device at 49.7 MHz, 76 MHz and 144.6 MHz (note that values for operation at ~100 MHz are conspicuously absent :~) ). Power output is listed as +5 or +10 db. (BTW, how do you relate this to something like milliwatts, for those of us who don't speak RF-ese?). Have Fun, -- ******************************************************************** * Kelly McArthur ..tektronix!sequent!ether!kellym * * HALF Associates (Heavily Armed Lunatic Fringe) * ********************************************************************