Thursday, April 01, 2010

High performance bi-directional mixer

Following some ideas from a fellow ham decided to try an high performance rf front end with easily to find components.
This particular front end is excellent from around 1Mhz to 200Mhz with the added advantage that is bi directional and you can use the same schematic for the BFO part but it's a waist of ferrite cores so use the lower part of the schematic the LM741.

In my preliminary tests this front end had the same performance of my FT-102 and I wasn't using bandpass filters... When the TS-50 was crumbling with BCI this front end was digging out signals from mars... I guess the secret of this design is dividing the signal in two and then combining again out in oposit phase. Will investigate this better tomorow.

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