Ramsey Electronics QRP-80 Instruction Manual download pdf (Page 12)

QAMP-80 • 12

end with solder all the way up to the core body. This winding is the 2

turn center-tapped primary of T1.

 47. Locate the smaller transformer (T2) and install it snugly on the PC

board.

 48. Install the larger transformer (T1) into the indicated location on the PC

board.

 49. Install L1, a 25 turn toroid inductor wound previously. If desired, a small

dab of hot melt glue, bathtub sealer, or caulk may be used to secure the

toroids.

 50. Install L2, the 28 turn toroid inductor - you marked it special,

remember?

 51. Install L3, the remaining 25 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:

• 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.

• 2. 12 volt DC power source of at least 3 amp capacity.

• 3. Suitable dummy load and resonant antenna.

• 4. QRP transmitter with a power output in the ½ to 2 watt range,

such as the Ramsey QRP-80.

• 5. Proper cables to interface between the QRP transmitter and the

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Ramsey Electronics QRP-80 Instruction Manual Page 12