Ramsey Electronics HR20 manual LEARN-AS-YOU-BUILD Receiver Assembly Strategy

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"LEARN-AS-YOU-BUILD" RECEIVER ASSEMBLY STRATEGY:

To help you learn just what exactly is going on we'll discuss the purpose of most of the components or groups of components as we go along. Since we are trying to keep assembly of the board simple, we will not be able to fully describe each individual component’s function as you build, but Ramsey's "Learn-As-You-Build" kit assembly philosophy still stands.

Check off each step as understood and completed. Examine the schematic diagram and PC-board X-ray illustration as you proceed. In all steps, “install” means to insert into the correct PC-board holes, solder properly, and trim all excess component leads.

Use good soldering skills - let your soldering iron heat each connection wire so that the wire itself and the foil trace both become hot enough together to melt the applied solder so that it flows smoothly around the wire lead and on to the PC board trace.

Mount all electrical parts on the top side of the board provided. This is the side that has no traces or pads on it. When parts are installed, they are placed flat to the board, and the leads are bent on the backside of the board to prevent the part from falling out before soldering. The part is then soldered securely to the board, and the remaining lead length is then clipped off. The clipped off leads should be saved for later use as jumper wires.

As you can see in examining the circuit board and parts there are many tall components such as the potentiometer, capacitors, and switches along with a lot of small parts. First you will install the larger components so they can be used as markers. So that you don't spend extra time "troubleshooting" we strongly recommend that you follow the assembly strategy and step-by-step procedures we have provided.

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Contents ALL Mode Receiver KIT Partial List of Available Kits Ramsey Transmitter Kits HR20 Amateur Receiver KIT Introduction Ramsey HR-SERIES Amateur ReceiversAbout Direct Conversion Receivers Circuit Description Capacitors Parts Supplied with the HR20 KITLEARN-AS-YOU-BUILD Receiver Assembly Strategy HR20 HR20 Parts Layout Diagram Receiver Assembly HR20 HR20 Initial Testing of Your HR20 Required for Initial Testing and AlignmentAlignment Alignment Hint for ALL Direct Conversion ReceiversUsing Your Receiver Tuning SSB SignalsCW Operation On the AIR TRANS-RECEIVINGSpeaker Operation More Audio Power Another WAY Adding AN LED Power on IndicatorTroubleshooting Tips Alternate Power Sources General Notes for Experienced QRP BuildersBandspread and Tuning Range Direct Frequency Readout Frequency StabilityOther Methods of Dial Calibration LM386 Audio Output HR20 Construction Notes Ramsey Kit Warranty Factory Repair of Assembled Kits Total Solder Points Estimated Assembly Time HR20 Amateur Receiver KITRequired Tools Additional Suggested Items