TM840 Service Manual
Transmitter
Frequency Stability ±1.5ppm
Power Output
L：25W/5W，H：40W/25W
FM Hum and Noise -40dB@12.5kHz/-43dB@20kHz/-45dB@25kHz
Conducted/Radiated Emission
-36dBm@<1GHz，-30dBm@>1GHz
Adjacent Channel Power
60dB@12.5kHz，70dB@20/25kHz
FM Modulation 11K0F3E@12.5kHz,14K0F3E@20kHz,16K0F3E@25kHz
4FSK Modulation
12.5kHz（Data）： 7K60FXD
12.5kHz（D+V）： 7K60FXE
Modulation Limiting ±2.5kHz@12.5kHz, ±4kHz@20kHz, ±5kHz@25kHz
Audio Response +1dB~-3dB
Audio Distortion 3％
Vocoder AMBE++
Digital Protocol ETSI TS 102 361-1, -2, -3
GPS
TTFF（Cold Start）Time to First Fix <60 seconds
TTFF（Hot Start）Time to Frist Fix <10 seconds
Horizontal Accuracy <10 meters
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