Ramsey Electronics PR20 User Manual
Page 7
PR20—7
3. Install C4, 100pF (marked 100 or 101).
4. Install C5, .01uF (marked .01 or 103 or 10nF). Disc capacitor C5 is the bypass
capacitor for the DC voltage supply points on the PC board.
5. Install Q1, 2SC2498. Press Q1 into its respective location on the PC board, which
should be quite obvious by the placement of the previous parts. Orient the flat side
as shown on the PC board illustration. Press the transistor in place firmly with
finger pressure so that a minimum amount of wire leads are exposed above the PC
board. In soldering, do not be afraid to apply enough heat to make good, clean, solid
connections.
6. Install C3, 10pF (marked 10).
7. Install C2, 2 or 2.2pF (marked 2 or 2.2). C2 and L1 form the tuned input filter.
8. Install C1, 2 or 2.2pF (marked 2 or 2.2). C1 is the antenna input coupling capacitor.
9. Install L1, the shielded coil. L1 fits only one way, with the three thin leads oriented
toward Q1. This coil has metal mounting tabs; use plenty of heat to solder these.