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Three sections of the receiver are modified for SWL reception. The first one is the "VFO and Amplifier" Section. The VFO frequencies are changed and the IR devices are replaced by SPST switches. One coupling capacitor to the main tuning capacitor is raised and the capacitor at the 10.545 relay is removed. Small SPST switches are wired to the board to provide VFO switching. Soldering the IR devices on the board is optional. The Crystal Filters are modified in the "First Mixer, Post-mixer Amplifier, Crystal Filters" Section. Two of the crystals are removed to provide a wider bandwidth for AM reception. The third section, "BFO and Amplifier, Product Detector and Audio Amplifiers" Section, is built for AM detection by modifying the Product Detector, disconnecting the BFO, and bypassing the audio pre-amplifier. |
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Soldering the BoardsAlso see Soldering Stations and Techniques For the Electroluminescent Receiver Kit for more details. Please build the kit with SAFETY in mind. Be careful with a hot soldering gun loaded with solder and clipping leads off the boards. Take your time and don't work on the kit when frustrated with life problems (though there is a possibility working on the kit can be good relaxing therapy). Use solder that does not leave a large amount of rosin on the board. Using too much rosin will leave the board a dull color. With proper solder, your joints will be a bright silver color when finished. The best solder to use is silver solder available in a small roll (1.5 oz.) from Radio Shack, part no. 64-013 E. The solder is .022 inch diameter with a 62/36/2 mix. It is labeled "High-Tech Rosin-Core Silver-Bearing Solder" with a red and white label. O |