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[. . . ] 20 MTR 20 WATT QRP LINEAR AMPLIFIER KIT
Ramsey Electronics Model No. QAMP20
Need a little extra boost for your QRP rig?Believe it or not, 20 watts is only about an `S' unit below a 100 watt rig!This nifty little amp will add some "punch" to any QRP transmitter.
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Works great with Ramsey QRP rigs or any other 1-2 watt transmitters Built-in T/R relay automatically switches between receive and transmit Runs on 12 volts DC at 2 to 4 amps; ideal for field day or battery operation Multistage low pass filter for a clean signal Operates all modes: CW, SSB, or AM Fast, easy, and fun 2 hour assembly Informative manual answers questions on theory, hook-ups, and uses - enhances resale value too! [. . . ] If desired, a small dab of hot melt glue, bathtub sealer, or caulk may be used to secure the toroids.
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50. Install L2, the 14 turn toroid inductor - you marked it special, remember?Install L3, the remaining 12 turn toroid inductor. This completes the assembly of your QRP power amplifier. Now's a good time to give your masterpiece a good going over, being especially alert for any:
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bridged-over solder joints; misplaced components; transistors or diodes placed wrong; electrolytic capacitors installed wrong.
INITIAL TESTS: To prepare your amplifier for testing you'll need the following: · 1. Multimeter capable of measuring voltage and current. 12 volt DC power source of at least 3 amp capacity. Suitable dummy load and resonant antenna. QRP transmitter with a power output in the ½ to 2 watt range, such as the Ramsey QRP-20. Proper cables to interface between the QRP transmitter and the QRP power amplifier. With the above all set up and handy, let's get testing!Connect a multimeter to TP1; set the meter to read up to 5 volts DC 3. Connect a dummy load to J1, the amplifier RF output. In a pinch, a light bulb may be used - see the section, "Verifying RF Power Output. "
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4. Temporarily install a jumper from the collector of Q3 to ground. Apply power to the amplifier but do not turn on the transmitter. Measure the current drawn by the amplifier and slowly rotate the bias pot, R4, clockwise until you reach a reading of ¼ amp. Do not allow the current to rise above ½ amp. If you cannot adjust or reduce the current, disconnect the power supply and consult the troubleshooting hints section. The voltage at TP1 should be about 3. 2 to 3. 5 volts. Connect the QRP transmitter to the input of the amplifier. You should hear the T-R relay click and see amplified power output. [. . . ] No repair will be undertaken until we have received the MINIMUM repair fee (1/2 hour labor) of $25. 00, or authorization to charge it to your credit card account. INCLUDE a description of the problem and legible return address. DO NOT send a separate letter; include all correspondence with the unit. Please do not include your own hardware such as non-Ramsey cabinets, knobs, cables, external battery packs and the like. [. . . ]
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