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Updated to specify that C55 should NOT be installed.
ATTENTION:An SMT capacitor on pin 1 of the Si570 needs to be removed to comply with the NO CONNECT for this pin for the Si570 supplied with the various kits. Having this capacitor mounted on the circuit board degrades the performance of the RXTX transceiver, especially the higher frequency builds of this kit.
Extensive rewrite of the Theory section for the TX Mix stage, based upon input from Milt, W8NUE.
This should resolve the confusion alluded to in this topic on the reflector.
Added caveat on Project BOM listing concerning the 100k resistor that is NOT included in the kit but must be provided by the user if they are to perform the (optional) Functional test of the TX Opamps.
Added section between Completed Board photos and the testing section to provide a link to a view of the entire schematic, with the completed stages tinted yellow-ish and the stages left to be done tinted blue-ish and the current stage untinted.
This was per a suggestion from Alan, G4ZFQ, that we provide a "birds-eye, contextual" view of where we are in the build at any stage.
Component values for the 40/30/20m RXTX have changed after considerable discussion in this thread.
The new values have been updated to the documentation. Here is a summary of the changes:
Modified instructions for installation of T6 (Antenna Isolation Xfrmr).
For details refer to the excellent paper by Alan G4zfQ.