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UHF RADIO CONTROL Using ATtiny

2015-03-03 06:27  
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The controller will be used on the UHF transmitter. It converts a standard PPM sum signal input to a modified one which is feed into the radios modulation circuit. Conversion means in this case that the PPM sync cap will be reduced to 3ms to prevent the radios TX circuit getting distorted.

It handles also switching between RX and TX when the PPM signal is present and signal quality is OK.

Optional the transmitters PLL will be controlled to set a customized frequency. Useful to prevent interferences from the standard GMRS/FRS/PMR/LPD channels and communication.

An AVR ATtiny24/44/84 running at 8MHz is used on the controller hardware.
The PCB can be glued onto the UHF radios PCB.

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