Linear tech, Maxim, and I think ADI, have some direct-conversion quadrature receivers that'll get you down to baseband -- decoding the data is your job, but it should be quite doable with a DsPIC, other small DSP, or (gasp) analog circuitry.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Maybe some of these...
-- Luhan Monat (luhanis 'at' yahoo 'dot' com) "The future is not what it used to be..." http://members.cox.net/berniekm
There are these extremely simple to apply transmitter chips such as the ADF7011, which are a 76kbit transmitters including VCO & PLL. A few R & C and you're done. This gives me complete transmitter on a thumbnail, just the actual microcontroller delivering the data is to be added plus a quartz signal. 30mA supply at 3V and it costs 4$. Now comes the stupid part. How am I expected to receive the signals ? Yes, I could build a PLL with a VCO, crystal, then perhaps an AFC to lock to the frequency unless I'm hopping the freqeuncy. Downmix to whatever and decode the bits. It takes few hundred mA and perhaps a handsized pcb. Or downconvert with a PLL multiplied Quartz from a DSP, sample at few MSamples and have some code to extract the bits.
I'm somehow expecting a thumbnail sized receiver equally trivial to build like the transmitter. No ? Did I miss something ?
Rene
-- Ing.Buero R.Tschaggelar - http://www.ibrtses.com & commercial newsgroups - http://www.talkto.net
nope, AD only seem to make TX's or RX/TX
Dumb eh?
martin
"An eye for an eye makes the whole world blind" Gandhi
Apparently. They somehow figured the need for a receiver to be (much) smaller than for transmitter or transceivers. Or they figured it to be done differently, such a with an ADC at a subharmonic.
Rene
Thanks. the receivers are rather slow with 4800 baud.
Rene
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