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2N2/XX Block Diagram

2N2/20 Block Diagram
The 2N2/XX follows the general design of many QRP rigs. It consists of a superheterodyne conversion strip (upper row of blocks) on the receive side and a complete RF generation strip (lower row of blocks) on the transmit side. Both sections share a common VFO. No RF Amplifier is used in the 40-meter version of the rig. Each of these subsystems contains a Local Oscillator (LO). The receive LO allows one to optimize receiver response by centering the receive pass band to the center of the crystal IF filter. On the transmit side, a separate LO provides offset adjustment, resulting in a side tone matching the received audio. Switching between receive and transmit is done with solid-state switches to provide QSK capability. When transmitting, the 2N2/XX is listening to its own signal.

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