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AR1 • 12

ASSEMBLY INSTRUCTIONS

 1. Press S1 firmly into its six holes and solder all six pins. The switch fits

in the board only one way. Be sure the white plastic push button extends

out over the edge of the printed circuit board.

 2. Install J1, the RCA-style antenna jack. Solder all 4 points. The jack

presses into the board quite firmly.

 3. Install J2, the subminiature phone jack. Solder all 3 points. Be patient

and gentle in inserting, so as not to damage the soldering tabs.

 4. Installation of Controls. Your kit contains potentiometers for tuning,

volume and squelch controls. These controls are directly mounted to the

PC board. Insert all three controls, R1, R2 and R3 fully in their positions

and solder the controls firmly. Be sure the mounting tabs are completely

soldered for a good mechanical connection.

ANTENNA INPUT AND PREAMPLIFIER SECTION

 5. Install C1, .001 µF disc capacitor (marked .001 or 102).

 6. Install C2, 82pF.

 7. Install L1, the small pre-wound 2-turn coil. Gently stretch the coil just

enough so that the two ends fit firmly into the PC board holes. Solder

both ends securely.

 8. Install L2, .33 µH inductor (orange-orange-silver dots or bands).

 9. Install C3, 3.9 pF.

 10. Install C4, 82 pF.

 11. Install L3, 2 turn pre-wound coil.

 12. Install L4, the other .33 µH inductor.

 13. Install C5, 3.9 pF.

 14. Install C6, 82 pF.

 15. Install L5, 2 turn pre-wound coil.

 16. Install C7, .001 µF (marked .001 or 102).

 17. Clearly identify Q1, the 2SC2498 or 2570A transistor. Do not confuse

it with the other transistor supplied (2N3904). Position Q1 as shown on

the Parts Layout Diagram. Press Q1 snugly into its holes so that only a

minimum amount of wire lead is exposed above the board. In soldering,

do not be afraid to use enough heat to make good connections.

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Ramsey Electronics AM25 Bedienerhandbuch Seite 12