Ramsey Electronics manual PR20-7

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‰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.

PR20—7

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Contents LOW Noise Preamp KIT Introduction to the PR20 LOW Noise Preamplifier Circuit Description Parts Supplied with PR20 KIT Ramsey PR20 PRE-AMP Parts Layout Disregard C6PR20 PRE-AMP Assembly Procedure PR20-7 Input and Output Connections Testing and Adjustment Strong Signal OVER-LOADING PR20 ON-OFF Switching SuggestionMHz Active Antenna Switching Considerations for Transceiver Operation2SC2498 Characteristics Conclusion Troubleshooting GuideRamsey PR2 the Ultimate Broadband Preamplifier Ramsey Kit Warranty Call or write for our full line catalog