I'm using the wein bridge to generate audio tones that are fed to the
transmitter for digital radio communication (basically a homebrew ASK
radio modem). I'd be open to using that, but I'm not aware of any
radio modems that output square waves.

This oscillator also has 2 digital pots attached: 1 to trim the space
tone, and 1 to trim the mark tone. There's a high speed switch
between the two pots to rapidly switch between mark and space tones.
I could use this same setup with a 555 and trim the resistor to vary
the pulse duration, but I'm not sure what impact a square wave would
have on transmission, reception, decoding, etc...?

Has anyone heard of a square wave being used as an audio tone for
digital radio communication?

Thanks in advance,
Dave

On Oct 30, 12:06*pm, George Herold wrote:
Hmm I have no idea if that will make any difference. *What are you
using to control the feedback? *Can you use a more robust oscillator
(as John suggested) Some type of 'bang-bang' rather than sitting on
the 'knife-edge' of oscillation with the Wein bridge. *I needed the
low harmonic distortion of the Wein bridge... Is that what you need?

George H.