I built the discrete component version of the Gilbert cell mixer described in EMRFD (figure 5-28).? It's in the
front-end of a home-brew direct-conversion transceiver I made for 20 meters.? It allegedly has much higher
dynamic range than the NE602 family of devices.? I have no way of measuring dynamic range but it performs
quite well, even with a 22kW AM BCB station just 3km away.? Though - my antenna coupler is configured as
high-pass, so that buys me some protection.
Like the commercial version, it has lots of conversion gain.? I often run it with at least 6dB of attenuation.
Good luck
Jerry W
KI4IO
Warrenton, VA
