WSPR Audio Signal Source

I have documented my most recent project that allows a portable SSB QRP transceiver to transmit WSPR beacons from a portable location without a computer.

The project consists of a simple audio oscillator controlled by a Microchip 16F628 PIC that has the following capabilities:

- Internal timing or NMEA GPS timing for UTC synchronization of WSPR transmissions.
- RS232 input of the WSPR message.
- Line or microphone output.
- Symbol data output available to modulate a VXCO
- Low power consumption allowing battery operation

The documentation is located at:
http://www.knology.net/~gmarcus/