Choice and operation of VCO for AFSK transmitter

Discussion in 'The Projects Forum' started by ozmo, May 3, 2011.

  1. ozmo

    Thread Starter New Member

    Dec 15, 2009
    10
    0
    I'm working on a project where I'll be making an Arduino-controlled binary AFSK transmitter. I'm using the same frequencies set out in the Bell 202 standard; that is, 1200 Hz and 2200 Hz

    How can I go about choosing and an appropriate VCO for this purpose?

    When I go on Mouser/Digikey searching for 'VCO', I get tons of results, but they're all for much higher frequencies.

    Am I looking for the wrong thing? Am I supposed to use a frequency divider? Alternatively, at these low frequencies could I build my own VCO? Or a final option, build two regular oscillators, and switch between them.

    I'm not sure which of these options (or other options) are most practicable. Thanks in advance for any help.
     
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