 |
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|
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|
|
|
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|
|
|
|
|
|
|
| – |
FCC
allocated spectrum space in the 800 MHz
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spectrum
and issued licenses for test systems in
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Chicago
and Washington, D.C.
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| – |
first
commercial systems available 1983, available in all
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major
cities in US in a few years
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| – |
AMPS
result of extensive research by Bell Labs in
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|
1960s
and 1970s
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| – |
800
MHz band was compromise
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n |
lower
frequencies occupied by FM and TV systems
|
|
|
|
n |
higher
frequencies were deemed too unreliable (information
|
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|
loss
due to weather conditions, multipath fading, etc.) with
|
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|
existing
technology
|
|
