1. Modulation

2. Definitions Amplitude: “Size” Frequency: “Rate of occurrence”
Phase: “Position or interval within a cycle”
Modulation: “To vary amplitude, frequency, or phase”

3. Pure Sine Wave (146 MHz, no info)
“Carrier”
Pure Sine Wave (146 MHz, no info)
“Magical”
Voltage or Current
NOT
These
Time or Distance

4. HF and VHF Carriers Voltage or Current Slow (HF, 80 m, 3 MHz)
Fast (VHF, 2 m, 144 MHz)
Time or Distance

5. Carrier/CW/AM
“Carrier”
Modulator
or speech AM
CW or OOK (BW=150 Hz)

6. AM vs. FM
Single Audio Tone
BWFM = 5 to 15 KHz

7. Sidebands AM
SSB
USB
LSB
DSB
3 KHz
Note break in axis
28 MHz

8. SSB (BW = 3 KHz) Long Distance or Weak Signal
1. Two Tone Test Waveform
2. Single Tone Test Waveform:
Just a pure RF sinewave offset from
carrier by audio tone frequency!!
Compression
“Splatter”
3. This is how SSB speech sounds (tuned, AM detection, untuned)
Sound clip:
Photo:

9. Amateur TV
Analog fast-scan NTSC
Widest BW (6 MHz)
440 MHz , 75 cm

10. Modulation Video Demos