2. You can't receive anything with a transmitter! But you can pick it up with any CW/SSB receiver.
That's clear...Certainly, just remove everything below the horizontal 10uH inductor
and fit a ~60pF variable capacitor from pin 1 to ground.
The schematic post #11 is correct.So the BB104G purpose is adding an ability to tune with changing the resistance? And I will lose it if I remove that diode...
The reason for having two is simple. If you have only one, the capacitance will go too low to be useful and the circuit won't operate. The idea is one is used to 'centralize' the tuning range and the other actually does the tuning. There is no need for them both to be variable but I would still leave some fixed capacitance there, maybe 27pF (~60/2) as the fixed one and 60pF as the variable. That gives a range of about 33pF to 87pF. Without the 27pF the range would be about 6pF to 60pF but a value as low as 6pF probably wouldn't work.Also, does it really needs to be TWO 60pF trimmers? I would replace it with a larger one. Bigger capacitance range of trimmer will cover more freqeuencies?
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