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
    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.