23 c/m FM TRANSMITTER FOR ATV WITH LED DISPLAY
The Top unit is a cheap 23c/m transmitter for Amateur Television in the UK the heart of it is a modified COMTECH TX and I have added a simple serial 8 Digit display. The whole thing needs 12 Volts and has two sound channels of 6.0MHz and 6.5MHz of which the later could be removed but I did not bother. I removed the plug in PIC16F84 and reprogrammed it with my own software to cope with the Display and the Buttons...One clever trick that I included thanks to Giles G1MFG was to store in the EEPROM on the PIC the last frequency before it was switched off.....The RED buttons tune up and the Black ones tune Down and I have two choices 125KHz steps or 1MHz steps... The measured power output was a good 80m/W a very reasonable amount of power .G3RFL.