Service Manual

GENERAL INFORMATION
1-5
Part No. 001-3474-002
The following are general specifications intended for use in testing and servicing this transceiver. For current
advertised specifications, refer to the specification sheet available from the Marketing Department. Specifications
are subject to change without notice.
GENERAL
Frequency Range 403-512 MHz
Frequency Control Synthesized
Channel Spacing 12.5/20/25 kHz
Mode of Operation Simplex or Half Duplex
Operating Voltage +7.5V DC ±10%
Regulated Supply Voltages +5V DC ±5%
RF Input/Output MCX Jack
Power and Data Interface 14-pin in-line socket, 100 mil center
Operating Temperature -30° to +60° C (-22° to +140° F)
Maximum Dimensions 2.83" L (7.19 cm), 2.19" W (5.56 cm), 0.64" H (1.70 cm)
Weight (w/o Loader Bd) 2.3 oz (65 g)
FCC Compliance DM3474 customer must apply
RECEIVER
Bandwidth 16 MHz
Frequency Stability ±1.5 PPM
Sensitivity - 12 dB SINAD 0.45 µV
RF Input Impedance 50 ohms
Spurious and Image Rejection -70 dB
Selectivity -60 dB (12.5 kHz), -70 dB (20/25 kHz)
Intermodulation -70 dB
FM Hum and Noise -40 dB (12.5 kHz), -45 dB (20/25 kHz)
Conducted Spurious -57 dBm
Receive Current Drain < 70 mA nominal
Receive Attack Time < 7 ms (dependent on synthesizer loading implementation)
Audio
Distortion < 3%
Output Level DM3474 600-1200 mV P-P or 200-400 mV RMS (1 kHz at ±3 kHz)
Response
DM3474 ±2 dB from DC to 5 kHz (reference to 1 kHz)
Minimum Load Impedance 1k ohms
TRANSMITTER
Bandwidth 16 MHz
Frequency Stability ±1.5 PPM
TCXO Coupling DC
RF Power Output 2W nominal adjustable to 500 mW (-XX0)
500 mW nominal
RF Output Impedance 50 ohms
Modulation Distortion < 3%