Operation Guide

OG_LMD-401_v10e Circuit Design, Inc. 4
OPERATION GUIDE
SPECIFICATIONS
LMD-401 All ratings at 25 +/-10 °C unless otherwise noted
General characteristics
Item Units MIN TYP MAX Remarks
Applicable standard FCC Part 90.217, ISED RSS-119
Communication method Simplex, Half-duplex
Emission class F1D
Modulation type GFSK
Operating frequency range MHz 458.000 462.500
Operation temperature range °C -20 65 No dew condensation
Storage temperature range °C -30 75 No dew condensation
Aging rate ppm -1 1 TX freq., RX Lo freq.
Initial frequency tolerance ppm -1 1 TX freq., RX Lo freq.
Dimensions mm 30 x 50 x 9 mm Not including antenna
Weight g 25 g
Electrical specification <Common>
Item MIN TYP MAX Remarks
Oscillation type PLL controlled VCO
Frequency stability (-20 to 65°C) ppm -2.5 2.5 Reference frequency at 25 °C
TX/RX switching time ms 15 20 DI/DO
Channel step kHz 12.5
Data rate bps 2400 4800 DO/DI
Max. pulse width ms 15 20 DO/DI
Min. pulse width us 200 DO/DI
Data polarity Positive DO/DI
PLL reference frequency MHz 21.25 TCXO
PLL response ms 30 60 from PLL setting to LD out
Antenna impedance Ω 50 Nominal
Operating voltage V 3.0 5.5
TX consumption current mA 46 50 Vcc = 3.0 V
RX consumption current mA 36 40 Vcc = 3.0 V
Transmitter part
Item MIN TYP MAX Remarks
RF output power* mW 10 Conducted 50 Ω
Deviation kHz +/-2.0 +/-2.4 +/-2.8 PN9 4800 bps
DI input level V 0 5.5 L= GND, H = 3 V- Vcc
Residual FM noise kHz 0.12 DI=L, LPF=20 kHz
Spurious emission dBm
-37 < 1000 MHz, conducted 50 Ω
-31 > 1000 MHz, conducted 50 Ω
Adjacent CH power dBm -20 +/-12.5 kHz, PN9 4800
Alternate adjacent CH power dBm -20 +/-25 kHz, PN9 4800
Occupied bandwidth kHz 8.5 PN9 4800
* The RF output power cannot be changed or adjusted.