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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©2021 Broadcast Electronics
• OPERATION MENUS
• Field #02: Direct & Reflected Power
Pd 20W Pr .2 W
XXXX |
This field shows the forward or “direct” power, Pd, and the reflected power, Pr, in the VHF models.
Transmitter models in the SHF band will not show the reflected power as a circulator is used in the
final RF amplifier stage in this band.
• Field #04: Multiplex Signal Level (Output Modulation)
MPX 75.0kHz + 0.0dB
############# |
This field shows the actual peak modulation level in dB referenced to the peak deviation in kHz. A
pseudo-analog moving bar functions as a modulation meter, leaving a peak mark at its end for 1 or 2
seconds. A vertical bar (|) on this line marks the 0dB position.
• Field #05: Left & Right Signal Level in dB
LEFT level - 3.0dB
RIGHT level - 3.5dB
This field shows the actual left and right peak modulation in dB referenced to 75kHz. The right
channel level has no meaning in the absence of an internal stereo-encoder.
The reading is fairly accurate with real audio signals. Some steady state test tones, especially at very
low audio frequency, may beat with the discrete ADC conversion sometimes producing reading
uncertainty (aliasing). In this case the MPX level reading will still correct overall modulation
measure.
• Field #06: L & R Signal Level / Analog Meter
L########### O |
R######### O |
This field shows the actual left and right peak modulation as two moving bars. A vertical line marks
0dB position and the same considerations as in the previous menu are still valid.