1. And other minutia KD7ZWV (Jan) jan.l.Peterson@gmail.com
HF (General) Bands
And other minutia
KD7ZWV (Jan)

2. What do we need to know? Review from last week Frequency Wavelength
Electromagnetic Radiation
Modulation
Signal Propagation
Ionospheric Layers
Bands
Regulations

3. Frequency Measured in Hz (Hertz) kHz (1,000 Hz) MHz (1,000,000 Hz)
Cycles “per second”
Examples

4. Wavelength Units: meters (or metres if you’re European)
Measured “trough to trough” or “crest to crest”

5. Calculating Frequency or Wavelength
Wavelength (m) / Time (s) = Speed of Light (300,000,000 m/s)
Remember, Frequency is measured in Hz, or “per second” (1/s)
Wavelength (m) x Frequency (Hz) = Speed of Light (300,000,000 m/s)
Algebra Time!
Wavelength = Speed of Light / Frequency or
Frequency = Speed of Light / Wavelength
λ “lambda” == wavelength (in meters)
f frequency (in Hz)
c speed of light (in m/s) c
λ f

6. Electromagnetic Radiation

7. Modulation CW (continuous wave) Frequency Modulation
Amplitude Modulation
Single Side Band (USB or LSB)
Phone
Data

9. Direct Station to Station Operation

10. Signal Propagation

11. “Ionospheric Bounce”

12. “Ionospheric Bounce”

13. Bands Low Frequency = 2200 m Medium Frequency = 630 m, 160 m
High Frequency = 80 m, 60 m, 40 m, 30 m, 20 m, 17 m, 15 m, 12 m, 10 m
Very High Frequency = 6 m, 4 m, 2 m, 1.25 m, 70 cm, 33 cm, 23 cm, 13 cm

14. Low Frequency 2200 m 135.7 kHz to 137.8 kHz
POWER RESTRICTION: 1 W EIRP maximum

15. 160 m (Medium Frequency)
1.8 MHz to 2.0 MHz

16. 80 m (High Frequency)
3.5 MHz to 4.0 MHz

17. 60 m (High Frequency)
5 MHz Channels
POWER RESTRICTION: 100 W PEP

18. 40 m (High Frequency)
7.0 MHz to 7.3 MHz

19. 30 m (High Frequency)
10.1 MHz to MHz

20. 20 m (High Frequency)
14.0 MHz to MHz

21. 17 m (High Frequency)
MHz to MHz

22. 15 m (High Frequency)
21.0 MHz to MHz

23. 12 m (High Frequency)
24.89 MHz to MHz

24. 10 m (High Frequency)
28 MHz to 29.7 MHz

25. 6 m (Very High Frequency)
50 MHz to 54 MHz

26. Band Chart

27. Questions and References