Samsung SCH-8500, Service Manual

Page: 6 / 42

1-3. 800MHz AMPS
1) General
Frequency Range
• Transmitter : 824~849 MHz
• Receiver : 869~894MHz
Channel Spacing : 30kHz
Number of Channels : 832
Duplex Spacing : 45MHz
Frequency Stability : ±2.5ppm(-30°C ~ 60°C, -22°F ~ 140°F)
Modulation/Demodulation
• Voice : PM
• Data : FM
Operating Temperature :-30°C ~ 60°C, -22°F ~ 140°F
Supply Voltate : 3.6V
2) Transmitter
RF output power : 0.6W(+2/-4dB)
Carrier ON/OFF conditions
“ON” Condition : within ±3dB of specification output(in 2 ms)
“OFF” Condition : below -60dBm(in 2ms)
Compresssor
Compression Rate : 2 : 1
Attack Time : 3ms
Recovery Time : 13.5ms
Reference Input : input power level for producing a nominal ±2.9kHz
: peak frequency deviation of transmitted carrier
Preamphasis : 6dB/OCT within 0.3 ~ 3 kHz
Maximum Frequency Deviation
F3 of G3 :±12 kHz
Supervisory Audio Tone : ±2 kHz(±10%)
Signaling Tone : ±8 kHz(±10%)
Wideband Data : ±8 kHz(±10%)
Post Deviation Limiter Filter
3.0 ~ 5.9 kHz : above 40 LOG(F/3000)dB
5.9 ~ 6.1 kHz : above 35dB
6.1 ~ 15 kHz : above 40 LOG(F/3000)dB
Over 15 kHz : above 28 dB
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