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ANTENTOP- 02- 2004, # 006  

Crystal Sets to Sideband

 

 

  • A QRP regulated power supply
  • A battery power supply for the radio shack
  • Solar cell charging, low drop-out regulators
  • Battery powered shack lighting

 

Chapter 9

 

ACCESSORIES FOR THE TRANSMITTER

 

  • A straight key
  • An electronic bug
  • Building dummy loads
  • "T" type antenna coupler
  • A low pass filter
  • How to stay legal with a homebrew transmitter
  • Antenna and power relays
  • Homebrew QSL cards

 

Chapter 10

 

VARIABLE FREQUENCY OSCILLATORS

 

  • Drift is a big deal today
  • Low frequency VFOs drift less than high frequency VFOs
  • JFET transistors
  • The oscillator circuit
  • The buffer, final amplifier and output filter
  • The 50 secrets of avoiding drift
  • JFETs, single-side PC boards, cast metal box, multiple NPO caps, small variable caps, precision voltage regulation and more
  • Vernier tuning
  • Varactor tuning elements – advantages and disadvantages
  • A precision power supply
  • A voltage doubler power supply for battery use
  • Square wave generator with a multivibrator
  • Squaring up the square wave
  • Charge pump, diode/ capacitor voltage doubler
  • Schottky diodes for efficiency
  • Temperature compensation methods
  • Positive coefficient capacitive trimmer compensation
  • How to adjust the compensator
  • Thermistor/ varactor temperature compensation

Chapter 11

 

Building a VFO for the higher bands (PMOs)

 

  • Old approaches that no longer work
  • Frequency multiplication
  • High frequency oscillators
  • PreMix Oscillator method of frequency translation
  • A VFO-controlled QRP module
 
  • Crystal oscillators are stable, aren’t they?
  • Crystal oscillator circuits
  • Butler oscillators and big crystals
  • Mixers, bipolar transistor and dual-gate MOSFET
  • Optimum drive requirements
  • Direction of tuning, drift error cancellation
  • Multistage filters and filter/amplifiers
  • The QRP final amplifier stages

 

Chapter 12

 

FINAL AMPLIFIERS

 

  • The basic features of a modern linear power amplifier
  • It looked easier in the Handbook
  • Linear "noise mode" operation
  • A tuned 50 watt class B amplifier
  • Ferrite balun transformers
  • An untuned, sort-of-linear, class B, amplifier
  • Keying the 50 watt transmitter
  • A linear Class AB amplifier, this time for sure
  • Single Sideband (SSB) needs a linear
  • Biasing without thermal runaway
  • Clamp diodes prevent runaway
  • Mechanical construction

 

 Chapter 13

 

BUILDING A HOMEBREW HF RECEIVER

 

  • Building a receiver - an unusual adventure
  • What’s a reasonable goal?
  • An "adequate performance" HF communication receiver
  • Does it have to be so complicated?
  • Planning your receiver
  • Direct conversion versus superhetrodyne
  • Why not single conversion?
  • Start with a single-band, single-conversion superhetrodyne
  • How do modern digital receivers do it?
  • Receiver construction – build with shielded modules connected by thin coax.
  • The 80 meter preselector
  • Reception on 80 meter and 160 meters is aided by a tuned transmatch
  • The Variable Frequency Oscillator
  • Mixer magic
  • Mixers will give you lots of static – and howls and squeals
  • A practical homebrew mixer made from discrete parts – it’s harder than it looks
  • Dual gate MOSFET mixers
  • Not all MOSFETS work equally well
  • Crystal ladder filters – essential for CW
  • All 9.000 MHz crystals aren’t equal
 

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