求教数传电台问题
现在看到太多的方案1102
4432
7102
如果要适合以下指标，大家推荐那个方案？
Frequency Range: 410 – 470 MHz
Frequency Increments: 6.25 and 5.0 kHz
Frequency Stability: 1.5 ppm, –40 to +85 degrees C
Channel Spacing: 6.25 and 5.0 kHz
Modulation Type: GMSK (Gaussian-mean Shift Keying)
Carrier Power: 0.5 W, 2 W programmable
(+27 DBM, +33 dBm)
Duty Cycle: 50%
Output Impedance: 50 ohms
RF Connection: Pads for SMT IMP 3 mm RF connector, mmcx
Spurious and Harmonics: –65 dBc
Transmitter Keying: ON TX_ON
Key-up Time: 5 ms
Data Rate Over-the-Air : 4800, 8000, 9600, 16000, and 19200 bps
(Rate user-selectable via BAUD command)
RECEIVER
Type: Double conversion superheterodyne
(45 MHz IF)
Frequency Range: 410 – 470 MHz
Frequency Increments: 6.25 kHz
Frequency Stability: 1.5 ppm, –40 to +85 degrees C
Spurious and Image Rejection: –70 dB
Sensitivity: 12 dB SINAD @ –116 dBm @ 4800 bps
12 dB SINAD @ –110 dBm @ 19200 bps
ntermodulation Rejection: –70 dB minimum
Selectivity: 60 dB typical at adjacent channel (EIA)
Bandwidth: 12.5 kHz
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