136 kHz one knob QRSS receiver
By Claudio Pozzi, IK2PII - August 2003

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1.  The front end.

frontend circuit picture


2.  The local oscillator

local oscillator circuit picture




3.  The IF amplifier

IF circuit picture




4.  The product detector

product detector circuit picture




5.  The xtal filter frequency response

xtal filter bandwidth




6.  The One Knob QRSS Receiver at work

OKQRSSRX and Spectran display




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