: Includes frequency ranges (VHF: 136–174 MHz, UHF: 350–527 MHz) and power output details (1–45W depending on the model). Schematics & Circuit Diagrams
If the radio receives close-range signals but fails on distant ones, the crystal filters or the 455 kHz ceramic filter may be cracked from physical impact.
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: Inject an audio signal into the microphone path via the test box. Adjust the rated deviation settings to prevent bleeding into adjacent channels (typically 2.5 kHz for narrow bands and 5.0 kHz for wide bands). Software and Programming Prerequisites
VHF (136–162 MHz, 146–174 MHz) / UHF (403–440 MHz, 438–470 MHz) 64 Channels Power Output 1–25 Watts / 25–45 Watts (VHF) / 25–40 Watts (UHF) Channel Spacing 12.5 / 20 / 25 kHz Signaling Protocols MDC1200, Quick Call II, DTMF Key Updates in the Latest Service Manual Revisions motorola gm3688 service manual upd
Ensure the radio firmware is kept up to date alongside the service manual recommendations to fix known software bugs.
To perform a complete GM3688 service update, you should have the following: : Includes frequency ranges (VHF: 136–174 MHz, UHF:
The latest version of the Motorola GM3688 Service Manual (UPD) includes:
To ensure that technicians have access to the most up-to-date information, Motorola Solutions regularly updates the service manual for the GM3688. The latest updates (upd) to the manual include: Adjust the rated deviation settings to prevent bleeding