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If you are really trying to do an FSK decode in software on a PIC, with A/D input and DSP style noise bandwidth, you could base it on:
"A Dual-Tone Multifrequency Receiver Using Synchronous Additions and
Subtractions" by Y.Tadokoro and Y. Haneda published in IEEE
construction swr meter
I followed the reference to FAR Circuits to:
I could find no artwork for this project, but the directional coupler subsection does not seem to use one.
Glad you found it useful!
Have you successfully modelled other single supply opamps?
Do you know if this model has been used at 5V on another flavor of spice?
I have not used Microcap, but I would suspect the problem is in the model.