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Wireless Telephones

Many Amateur Radio bands are shared with other services.

Sometimes other services have a Primary allocation, while Amateurs have a Secondary allocation.

Our 902 - 928 MHz band does not overlap some cellular and mobile telephone bands in Canada, but comes quite close. (Licence exempt cordless phones may use this band however)

Our 2300-2450 MHz band does overlap with some of the telephone wireless services, and 2.4GHz cordless phones.

While on the one hand, this requires that amateurs using these bands must be careful about causing interference, it also means that there is, and will continue to be a source of relatively inexpensive equipment which can be converted for amateur use.

Here are some of the details of telephone systems used in Canada (courtesy VE3XK).

Standard Mobile Freq Range (MHz) Multiple Access Method Duplex Access Method Number of Channels Channel Spacing Modulation Method Channel Bit Rate
Analog Cellular Telephones
AMPS Rx:869-894 FDMA FDD 832 30 kHz FM n/a
NAMPS Rx:869-894 FDMA FDD 2496 10 kHz FM n/a
Digital Cellular Telephones
TDMA Rx:869-894 TDMA/FDM FDD 832 (3 users/ch) 30 kHz Pi/4 Shifted DQPSK 48.6 kb/s
(IS-54/136) Tx:824-849            
CDMA Rx:869-894 CDMA/FDM FDD 20 (798 users/ch) 1250 kHz QPSK/OQPSK 1.2288 Mb/s
(IS-95) Tx:824-849            
DCS Rx:1805-1880 TDMA/FDM FDD 124 (8 users/ch) 200 kHz GMSK (.3G) 270.833 kb/s
Wireless Data
CDPD Rx:869-894 FDMA FDD 832 30 kHz GMSK (.5G) 19.2 kb/s
Bluetooth 2400-2483.5 FHSS TDD 79 1 MHz GFSK (.5 G) 1 Mb/s
              721/56 kb/s
PCS Rx:1930-1990 TDMA (based on IS-136), CDMA (based on IS-95), Wideband CDMA, or CDMA/TDMA
  Tx: 1850-1910            
Analog Cordless Telephones
CT0 46-49 FDMA FDD 10 to 25 1.7 - 40 kHz FM n/a
CT2 864-868 TDMA/FDM TDD 40 100 kHz GFSK(.5G) 72 kb/s
CT2+ 944-948 TDMA/FDM TDD 40 100 kHz GFSK(.5G) 72 kb/s


AMPS Advanced Mobile Phone System
CDMA  Code Division Multiple Access
CDPD Cellular Digital Packet Data
DCS Digital Communication System
DQPSK Differential Quadrature Phase Shift Keying
FDD Frequency Division Duplex
FDM Frequency Division Multiplex
FDMA Frequency Division Multiple Access
FHSS Frequency Hopping Spread Spectrum
FM Frequency Modulation
GFSK Gaussian Frequency Shift Keying (with .5 Gaussian Filter
GMSK Gaussian Minimal Shift Keying (with either .3 or .5 Gaussian Filter)
NAMPS Narrowband Advanced Mobile Phone System
OQPSK Offset Quadrature Phase Shift Keying
QPSK Quadrature Phase Shift Keying
PCS Personal Communication System
TDD Time Division Duplex