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13_band_planning.md

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13A. Band Planning

Definitions

  • Bandwidth is the amount of frequency band that is required for each transmission
  • Beacons are specially licensed unattended transmitters that radiate a continuous signal to assist with checking of signal propagation
  • Channelised means that transmissions take place on specific frequencies or channels
  • S (Simplex) is the normal method of Amateur communication where both stations transmit, one at a time on a single frequency
  • R (Repeaters) are stations that re-transmit a received signal on a different frequency so as to allow further coverage of the transmission.
  • Calling frequencies are designated frequencies to establish initial contact

Notes

Suggested bands

Transmission Frequency
CW (Morse) bottom 100 kHz (i.e. 3.5-3.6 MHz)
RTTY (Teleprinters) 3.6 MHz (3.59-3.62 MHz)
SSB (speech) 3.6-3.9 MHz
SSTV (Slow Scan Television) usually found about 235 kHz from the bottom of the band (i.e. 3.735 MHz)
Long distance (DX) CW communication bottom 10 kHz of 80 Metres (3.50-3.51 MHz)
Long distance SSB communication top 10 kHz of 80 Metres (3.79-3.90 MHz)
Simplex - S10 - S23 use 25 Khz spaced frequencies from 145.250 MHz to 145.575 MHz
- followed by the repeater outputs RO - R7 on 25 KHz spaced frequencies between 145.6 MHz to 145.9 MHz
Repeater - R0 is at 145 MHz
- R1 - R8 is at 25 KHz intervals from 145.025 MHz to 145.200 MHz

The various types of transmission are given nominal segments so that you know where to 'look' for your particular interest

2 Meter Bands

Type Bandwidth
CW sector bottom 150 KHz (144 MHz - 144.15 MHz)
SSB speech 144.15 MHz - 144.5 MHz
open all modes 144.5 MHz - 144.9 MHz

S and R Channels

  • use FM (frequency modulation)
  • top of this band Is used for satellite communication
  • like frequencies on the lower half of this band is not channelised

Further Band Planning

Frequency Usage
144.01 MHz Moon bouncing
144.05 MHz CW calling frequency
144.3 MHz SSB calling frequency
144.5 MHz SSTU
144.6 MHz RTTY
145.3 MHz s12
145.5 MHz 520

Calling frequency

  • 40m amateur bands can very busy
  • 2m and 10m can be very quiet at times due to propagation or geographical difficulties
  • it is prudent to call on this calling frequency
  • as soon as two way communication has been established one of the stations should ask the other to stand-by
  • look for a clear frequency
    • ascertained that the frequency is not already busy by enquiring "Is this frequency in use please?"
    • many circumstances where only one side of a conversation may be audible
    • you may (unwittingly) be interfering with another conversation
  • then return to the calling frequency and suggest they change frequency to that chosen frequency

Compulsory

  • Self-imposed band planning works well most of the time
  • But, there might be odd cases who will decide to talk in the middle of the CW sector
  • They maintain there's nothing in the license saying they should / should not be inside the band