Technical Manual

GUARDIAN VHF 110W MOBILE 2-1
CHAPTER 2: HARDWARE THEORY OF OPERATION
2.1 Introduction
The Control Module contains the Receiver Exciter Control Module (RECM), Audio amplifier
board, Interface board, and display and keypad assemblies. The RECM is a shielded assembly
containing the transceiver and all control and signal processing hardware and firmware, except
the RF and audio power amplifiers. The trunk-mounted RF power amplifier contains a single PC
assembly.
Schematics for all the boards are located in the back of the manual.
2.2 System Specifications
Table 2-1: Guardian G25RMV110 Technical Specifications
Specification Description
General
Frequency Range 136.000 to 174.0000 MHz
Banks, Zones, Channels, Shadow 4 banks, 16 zones, 256 channels, 7 shadow
Voice Digital
Mode Voice Coding
IMBE 4.4 kb
Frame Re-sync Interval 180 msec
Error Correction Method RS, golay, hamming
Mounting Under dashboard using bracket
Dimensions 2.94”x7.13”x7.06” (H x W x D)
Weight 5 lbs. Approximately
Case Metal and plastic
Temperature Range
-30° to +60°C
Channel Spacing 12.5 and 25 kHz, selectable in 2.5 or 3.125 kHz steps
FCC Type Acceptance Number Pending
Industry Canada Pending
Receiver (Measurements per TIA/EIA 603 Standards)
Sensitivity
Digital Mode: 5% BER
Analog Mode: 12 dB SINAD
-116 dBm maximum
Spurious -70 dB
Intermodulation -70 dB
Audio Output Power 5W internal, 10W external speaker
Audio Distortion (at 1000 Hz) 5%
Frequency Stability (-30° to +60°C) ±2.5 ppm
Maximum Frequency Separation Full-band split
Transmitter (Measurements per TIA/EIA 603 Standards)
Duty Cycle 3%, 3 min continuous
RF Power Output 25W, 50W, 110W; also bypass mode
Spurious and Harmonic Emissions -70 dB
FM Hum and Noise (wide/narrowband) -48/-47 dB typical
FCC Modulation Designators 11K0F3E, 16K0F3E, 22K0F3E, 14K6F1E
Audio Distortion (at 1000 Hz) 5%
Audio Response (1000 Hz Ref.)
±3 dB 300 to 3000 (EIA/TIA 603)
Frequency Stability (-30° to +60°C) ±2.5 ppm