PDF DOWNLOAD: Chapter 6
BUILDING A QRP HOMEBREW
- A single-band, crystal-controlled, QRP module
- The transmitter mainframe
- HF construction methods
Making your own PC boards
“Dead Bug” and “Gouged Board” construction
Superglue “Island Boards”
Coax jumpers
Shielded boxes
- The complete QRP crystal-controlled transmitter
- Transistor amplifiers and oscillators
- How an amplifier becomes an oscillator
- Class A and Class C amplifiers
- Stabilizing the operating point, bypass caps, and emitter resistors
- Quartz crystals – the key to frequency stability
- The 40 meter QRP circuit
Oscillator and buffer
- Inductors, RF transformers, and impedance matching
- Tapped toroid inductors
How to wind them (and mistakes you might make)
- The final amplifier stages for the QRP
Tuned versus broadband – Use both for best results
Bifilar wound, broadband transformers
How to wind them (and how you might screw up)
Ferrite bead RF chokes, expensive RF power transistors, heat sinks, & output connectors
- Conquering inductors.
Calculating resonance
Calibrating trimmer capacitors
Calculating turns on powdered iron and ferrite toroids
Chebyshev output low pass filters
- Keying your QRP
MOSFET power transistors
- A “spot switch” for the QRP