First ideas are the following. The bag of components will be containing the following
- one oscillator for 5.0680MHz
- one oscillator for 5.0688MHz
- RA3AAE mixer for RX
- one XOR-doubler for TX
- 74HC4066 switch
- 12F629 controller
Both oscillators will be on at all times. Both oscillators are routed (74HC4066) to the active doubler which by default is switched off.
TX: The doubler is switched on only when the transmitter is keyed. The controller will route an oscillator to the doubler and activate the same.
RX: One oscillator is routed to the mixer, preferably via a 5.0688 crystal.
The controller will include a iambic keyer but will also allow for straight keying. A further task of the controller is to toggle between the high and low frequencies.