The radio also complies with MIL-STD 810C, D, and E international standards, confirming suitability for rough environments.
Low-power models (1–25W) and high-power models (25–45W VHF / 25–40W UHF). Channel Spacing: 12.5 kHz, 20 kHz, or 25 kHz. Dimensions: 44mm x 169mm x 118mm. Weight: Approximately 1.01 kg. 2. Receiver Block Diagram and Circuit Analysis
Understanding the baseline performance benchmarks of the Motorola GM3688 is critical before performing any hardware alignments or component replacements. The radio was manufactured in both VHF and UHF variants, utilizing distinct RF power envelopes. VHF Model Specification UHF Model Specification 136–174 MHz 350–380 MHz / 403–470 MHz / 490–527 MHz Channel Capacity 64 Channels 64 Channels Power Output 1–25W / 25–45W 1–25W / 25–40W Power Supply 13.8 Vdc (11.0–16.6 Vdc range) 13.8 Vdc (11.0–16.6 Vdc range) Channel Spacing 12.5 / 20 / 25 kHz 12.5 / 20 / 25 kHz Frequency Stability Receiver Sensitivity 0.35 µV (12.5 kHz) typical 0.30 µV (25 kHz) typical Environmental Sealing IP54 (Rain/Dust resistant) IP54 (Rain/Dust resistant) Shock / Vibration MIL-STD 810C, D, E & TIA/EIA 603 MIL-STD 810C, D, E & TIA/EIA 603 Component-Level Circuit Diagnostics
