User Manual
Table Of Contents
- REGULATORY AND SAFETY INFORMATION
- SPECIFICATIONS (GENERAL)
- INTRODUCTION
- GENERAL INFORMATION
- SITE PREPARATION
- EQUIPMENT INSTALLATION
- DC AND TONE REMOTE CONTROL INSTALLATION
- STATION TEST AND ALIGNMENT PROCEDURES
- INTRODUCTION
- GENERAL
- SUPPORT EQUIPMENT REQUIRED
- STATION CONFIGURATION
- STATION ALIGNMENT
- Preparation
- Station Pot Defaults
- Channel Guard (CG) Pot
- Transmit Limiter (TX) Pot
- Repeater Gain (RG) Pot
- DSP Line Input (DLI) Pot
- Compressor Gain (CP) Pot
- Compressor Threshold (CT) Pot
- DSP Line Cancellation (DC) Pot
- Line Output (LO) Pot
- P25 C4FM Deviation (DSP Module Adjustments)
- Enable the P25 Operation in the System Module
- Adjust P25 C4FM Deviation
- SINAD Test
- Squelch Adjustment
- Transmitter Forward and Reverse Power
- SYSTEM FUNCTIONAL TESTS
- MODULE TESTING AND ALIGNMENT
- PREVENTATIVE MAINTENANCE
- CHECKLISTS
MM102554V1 R1A
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3. Monitor J2 and align FL1 for a peak output level using a Spectrum Analyzer or RF Voltmeter.
Programmable bandwidth is ±1MHz.
4. Place the Front End Module on an extender card and connect the LO out of the RX Synthesizer and
the IF out of the Front End to the IF Module with 50Ω Coax cable.
5. Preset the Front End tuning slugs according to the instructions in the RX Front End technical manual
and apply an “on frequency” signal into the RF In on the Front End Module.
6. Monitor the RSSI metering function and adjust the level of the “on frequency” signal to the
responsive range of the meter.
7. Tune the Front End tuning slugs for a peak on the RSSI meter while reducing the input signal level to
keep the meter in the responsive reading range.
8. Replace all modules into the Station and confirm complete station alignment as described in Station
Alignment section.
10.5 STATION ADJUSTMENTS FOR REMOTE CONTROL OPERATION
Although audio levels should be considered on a system basis, it is appropriate to set the levels of the
remote controller and the control station panel by themselves with reference to the levels required by the
transmission path and then connect the controller(s) and station to the path. The transmission path, if it is
more than just a simple twisted pair, is usually set up with a "test tone". The "average voice" level is
defined as being a certain number of decibels below the test tone. The test tone is normally the maximum
level that can be sent through the path without clipping or being regulated. Although there is no definite
agreement on the difference between the test tone and average voice levels, 10 dB is an appropriate level.
In order to align the Remote Controller and T/R Shelf properly, it will be necessary to have some
information on the transmission path. This will help to determine the levels at each end required by the
system. Specifications needed include:
1. Loss at 1 kHz
2. Test tone or maximum level
3. Average voice level (if defined)
4. Loss at 2175 Hz (if tone remote)
The DSP Board performs tone detection in a tone remote installation. The "Secur-it" tone Decoder on
this board has a dynamic range of approximately 9 dB. The system must be set up such that the "Secur-it"
tones from all remotes in the system arrive at the T/R Shelf within this 9 dB window.
10.5.1 Line Out Level Adjustment
U36-1 is used to set the line out level. Analog switch U14 selects which audio source is routed to the line.
Possible sources are LOCAL MIC, VOL/SQ, auxiliary receiver audio, auxiliary receiver audio summed
with VOL/SQ (simultaneous monitor), DSP LINE/TX AUDIO, MODEM LINE data, OPEN (used for
battery alarm), GROUND (used for no transmission, and LINE IN audio (used for four wire loop around).
A battery alarm tone and/or VG ALERT tone may also be summed in with whichever source is selected
with the exception of GROUND. Typically LOCAL MIC, VOL/SQ, DSP LINE/TX AUDIO, OPEN, or
GROUND will be selected.
The gains in the circuitry are set such that 100 mVrms in on MIC HI or 1 Vrms (3 kHz deviation) in on
VOL/SQ HI (REPEAT AUDIO) will produce the same line output level. The gains for VG ALERT tone