Maintenance Manual
Table Of Contents
- 1 OVERVIEW Marti GTX / GRX
- 2 TECHNICAL SPECIFICATIOINS
- 3 INSTALLATION
- 4 SET UP
- 4.1 Password Organization
- 4.2 Factory Default Passwords
- 4.3 Display Menus and Navigation
- 4.3.1 START & DEFAULT FIELDS
- 4.3.2 TRANSMITTER FIELDS & MENU TREE
- OPERATION MENUS
- Field #02: Direct & Reflected Power
- Field #04: Multiplex Signal Level (Output Modulation)
- Field #05: Left & Right Signal Level in dB
- Field #06: L & R Signal Level / Analog Meter
- Field #07: RDS / SCA Auxiliary Modulation Level
- Field #09: Internal Voltages
- Field #10: Temperature, Data and Clock
- SETUP MENUS
- Field #21: Local/Remote control setup
- Field #22: Transmission Frequency setup
- Field #23: Output Power setup
- Field #24: LF Modulation Input Level setup
- Field #25: Auxiliary Input Level setup
- Field #26: Limiter setup
- Field #27: Transmission Mode, and Pre-emphasis Setup
- Field #28: Reference Deviation setup
- Field #29: Display Contrast setup
- Field #30: Time & Date setup
- Field #31: Elapsed Time
- Field #32: Password Management
- Field #33: Alarm Setup and Display
- Field #34: I/O Pin Allocation and Logic Level setup
- Field #35: Synthesis setup
- Field #37: Ethernet & Lan setup
- 4.3.3 RECEIVER FIELDS & MENU TREE
- OPERATION MENUS
- Field #02: Receiver Frequency
- Field #03: Received RF Field and Muting
- Field #04: MPX Modulation and Reception Field
- Field #04Modulation of the Multiplex Signal
- Fields #05 & #06: L and R Decoded Output Levels
- Field #08: Stereo Pilot Frequency level
- SETUP MENUS
- Field #22: Frequency setup
- Field #24: LF Output Level setup
- Field #25: Receiver Muting setup
- Field #26: De-emphasis setup
- Field #28: Optional Boards Detection
- Field #33: Alarm setup and display
- Field #34: I/O pin allocation and logic level setup
- Field #36 Left & Right Level
- Field #37 Headphone Volume
- Field #39 Serial Number
- 5 SERVICE & CHASSIS DIAGRAMS
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Transmitter Review
The transmitter and receiver set are fitted in the same sized cabinet and are nearly identical on the
front view. In fact they differ for the name on the front panel and the display and for the rear panel
connector's accommodation.
Both are clean and easy to control from the front panel through a single knob. The wide display and
simple self-explanatory menu allows navigation through the various options. A single fast push on
the jog knob acts as an "Enter" or confirmation while pushing for a longer time is interpreted as
"Escape".
Some LEDs signal at a glance proper functioning and warning states. Two red led signal warning
status, "Alarm" and "Limiter". A bi-stable yellow/green led signals "On the air" while a fourth one
signals "PLL Lock": both these two should be green in correct operation.
An RF Monitor output connector is located on the front panel for easy test on the field
An RF Circulator, aka Isolator, is used on models in the SHF band. The Isolator is not required on the
VHF/UHF bands
Figure 1 – GTX Transmitter Block Diagram