TM840 Service Manual
Transmitter
Frequency Stability
±1.5ppm
Power Output
L
:
25W/5W
,
H
:
40W/25W
FM Hum and Noise
[email protected]/-43dB@20kHz/-45dB@25kHz
Conducted/Radiated Emission
-36dBm@<1GHz
,
-30dBm@>1GHz
Adjacent Channel Power
,
70dB@20/25kHz
FM Modulation
[email protected],14K0F3E@20kHz,16K0F3E@25kHz
4FSK Modulation
12.5kHz
(
Data
):
7K60FXD
12.5kHz
(
D+V
):
7K60FXE
Modulation Limiting
±[email protected], ±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
35
Summary of Contents for TM840
Page 1: ...TM840 Service Manual I ...
Page 19: ...TM840 Service Manual Figure4 3 4 Click Next to keep on installation 16 ...
Page 60: ...TM840 Service Manual Figure1 TM840 400 470MHz Mainboard Top Side PCB View 57 ...
Page 61: ...TM840 Service Manual Figure2 TM840 400 470MHz Mainboard Bottom Side PCB View 58 ...
Page 62: ...TM840 Service Manual Figure3 TM840 400 470MHz Keypad Board Bottom Side PCB View 59 ...
Page 63: ...TM840 Service Manual Figure4 TM840 400 470MHz Keypad Board Top Side PCB View 60 ...
Page 82: ...TM840 Service Manual Figure7 TM840 136 174MHz Mainboard Top Side PCB View 79 ...
Page 83: ...TM840 Service Manual Figure8 TM840 136 174MHz Main Board Bottom Side PCB View 80 ...
Page 84: ...TM840 Service Manual Figure9 TM840 136 174MHz Keypad Board Bottom Side PCB View 81 ...
Page 85: ...TM840 Service Manual Figure10 TM840 136 174MHz Keypad Board Top Side PCB View 82 ...