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Here you can look the scheme, modulator for the transmitter
On AVR the processor.

You, can, make, good digital modulator for yours
Old R/C on AVR the processor AT90S4433 and Liquid Crystal of the Indicator.


My modulator on AVR the processor AT90S4433.
Wearing for the processor the version 11.
Wearing for the processor the version 12.
The transmitter Futaba Gold from AM by modulation.
The transmitter Futaba Gold with FM by modulation.
The description. Russian.

Both versions not commercial, but can have lacks.
Now, on model of the helicopter, now, I fly on the version 12.
Both versions, have memory on 6 models and 40 adjustments for each model.


The modulator on AVR the processor.

Exterior of the re-manufactured transmitter.

The re-manufactured transmitter inside.

The principal diagram of the modulator.