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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 |
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Tx:824-849 |
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| NAMPS |
Rx:869-894 |
FDMA |
FDD |
2496 |
10 kHz |
FM |
n/a |
| |
Tx:824-849 |
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| 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 |
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| CDMA |
Rx:869-894 |
CDMA/FDM |
FDD |
20 (798 users/ch) |
1250 kHz |
QPSK/OQPSK |
1.2288 Mb/s |
| (IS-95) |
Tx:824-849 |
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| DCS |
Rx:1805-1880 |
TDMA/FDM |
FDD |
124 (8 users/ch) |
200 kHz |
GMSK (.3G) |
270.833 kb/s |
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Tx:1710-1785 |
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| Wireless Data |
| CDPD |
Rx:869-894 |
FDMA |
FDD |
832 |
30 kHz |
GMSK (.5G) |
19.2 kb/s |
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Tx:824-849 |
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| Bluetooth |
2400-2483.5 |
FHSS |
TDD |
79 |
1 MHz |
GFSK (.5 G) |
1 Mb/s |
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721/56 kb/s |
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| PCS |
Rx:1930-1990 |
TDMA (based on IS-136), CDMA (based on IS-95), Wideband CDMA, or CDMA/TDMA |
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Tx: 1850-1910 |
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| Analog Cordless Telephones |
| CT0 |
46-49 |
FDMA |
FDD |
10 to 25 |
1.7 - 40 kHz |
FM |
n/a |
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| CT2 |
864-868 |
TDMA/FDM |
TDD |
40 |
100 kHz |
GFSK(.5G) |
72 kb/s |
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| CT2+ |
944-948 |
TDMA/FDM |
TDD |
40 |
100 kHz |
GFSK(.5G) |
72 kb/s |
| Legend |
| 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 |
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