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This amplifier follows the front end mixer and provides proper termination to the mixer without having to use a diplexer. From the ARRL 1986 Handbook, page 30-9, gives the specifications for the amplifier - "Amplifier gain, including the loss of the pad, is about 16 dB. The mixer has a loss of about 6 dB, leaving a net module gain of 10 dB. The amplifier output intercept is about +30 dBm." The transistor used in this circuit must have a high frequency response - 500MHz or better. A couple of substitutes are the 2N3866 or the 2SC1252. In my opinion, this amplifier is a fantastic circuit. Everyone I have built (20+ all done "dead bug" type construction) have worked perfect first time power was applied. It is stable as a rock and even with power applied and no terminations on the input or output, will not self-destruct. I have also used it as a VFO amplifier to drive old tube transmitters and can be used (with an appropriate bandpass filter) as a final for a QRP transmitter (without the 6dB pad, of course). This circuit is becoming one of the most popular post-mixer amplifiers in the high-performance receivers that are currently being published in the ham radio literature.
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