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2N2/XX 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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