NOTES: For the simplified receiver, delete R20A, R20B, R21, and
R55. Solder a jumper between X100 and S3 to
connect the loop input directly to U0.
Actual board size is 3.5" x 2.0"
All 4 corners of the board must be grounded to the minibox thru metal standoffs.
Solder 1/2" high shields along the long red pads bisecting U0 to help isolate the input.
Use small coax such as RG-178 for the loop input and Sig Out lines.