Digital low speed RF transceiver

Discussion in 'Wireless & RF Design' started by alan-31, Apr 21, 2010.

  1. alan-31

    Thread Starter New Member

    Mar 29, 2010
    8
    0
    Hi guy its me again!

    Ok, I tried searching for simpler RF circuits but there's a few and I don't know what to choose.

    Basically I want to make a pair of RF transceivers that can send/receive digital data. Speed is of no importance, simplicity is. Does anyone know of any circuits for that? I want to make this from the group up for learning. Help!
     
    Last edited: Apr 21, 2010
  2. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Is there a reason for the 1KB/sec datarate?

    You could use one that is capable of much faster then use software to only send at 1KB/sec.
     
  3. alan-31

    Thread Starter New Member

    Mar 29, 2010
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    0
    No, speed is not an issue at all. I fixed that now to say that. I just want something simple that I can build myself.
     
  4. skeptic

    Active Member

    Mar 7, 2010
    51
    9
    How far do you want to send the data?
     
  5. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
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    The circuits in this thread
    http://forum.allaboutcircuits.com/showthread.php?t=37316
    may be a reasonable starting point?

    Replace the relay with a load resistor to give a digital output and remove the capacitor & diodes straight below it (which control the relay back EMF) and you have a basic AM data link.

    You may have to adjust some filter caps to optimise it for higher speed, but in principle it could be OK for a few hundred baud.
     
  6. alan-31

    Thread Starter New Member

    Mar 29, 2010
    8
    0
    hi skeptic, data should be able to travel at least a few meters although say, 30 meters wouldn't be bad but its not required.

    Robert, those circuits are great in terms of simplicity (compared to the 2.4ghz project), but I can't read some of the values and more so, I'm afraid I wont be able to make that resistor/relay replacement or capacitor changes correctly. But I can go with these (with your changes) if I cant find anything else.

    Is there anything I can search on the internet to get more circuits like this? "RF remote control circuit"?

    EDIT: guys I found some 27 Mhz stuff, like this one. I'll check it out:
    http://talkingelectronics.com/projects/27MHz%20Transmitters/27MHzLinks-2.html
     
    Last edited: Apr 24, 2010
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