QRP
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QRP is a CW prosign that means "low power". It is commonly agreed that QRP refers to power of 5 watts or less. (The term QRPp is used for power less than 1 watt.)
The number of amateur operators engaging in QRP is growing. QRP rigs are ideal for field use, and they are easy to build as kits or homebrew. Because no high-power output transistors are needed in the final transmitter stage, they are inexpensive and safe for building, modification, and experimentation.