The 2N2/30 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. 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 2N2/30 is listening to its own signal. Not shown on this diagram is the keying block that causes the system to switch from receiving to transmitting.
Back to the "2N2/30" page