User's Manual
Table Of Contents
- 4. - ST-3118 RF DESCRIPTION
- 4.1. Circuit Configuration
- 4.2. Receiver System
- 4.2.1. Front-end RF Receiver
- 4.2.2. ANALOG Audio Processing
- 4.2.3. Virtual Squelch Circuit
- 4.2.4. Virtual VOLUME CONTROL
- 4.2.5. Sub audio signaling
- 4.2.6. ANALOG AUDIBLE SIGNALING
- 4.2.7. DIGITAL AUDIO PROCESSING
- 4.3. Transmitter System
- 4.3.1. ANALOG TX SIGNAL
- 4.3.2. DIGITAL TX AUDIO:
- 4.3.3. Drive and Final Amplifier Stages
- 4.3.4. Automatic Transmit Power Control
- 5. ST-3118 ALIGNMENT
- 5.1. Introduction
- 5.2. ALIGNMENT:
- 5.3. Required Test Equipment
- 5.4. Alignment Procedure
- 5.4.1. GENERAL ALIGNMENT CONSIDERATIONS:
- 5.5. MAIN RADIO ALIGNMENT
- 5.6. TRANSMITTER ALIGNMENT:
- 5.6.1. Main Clock alignment:
- 5.6.2. Transmit Power alignment:
- 5.6.2.1. High POWER LEVEL ALIGNMENT
- 5.6.2.2. Mid POWER LEVEL ALIGNMENT
- 5.6.2.3. LOW POWER LEVEL ALIGNMENT
- 5.6.3. ANALOG MAXIMUM DEVIATION
- 5.6.4. Modulation Gain alignment:
- 5.6.5. FDMA DATA MODULATION alignment:
- 5.6.6. TDMA DATA MODULATION alignment:
- 5.6.7. EIA tones Level Alignment:
- 5.6.8. DTMF signaling level alignment:
- 5.6.9. DCS signaling alignment:
- 5.6.10. CTCSS signaling alignment
- 5.6.11. FSK signaling alignment:
- 5.7. RECEIVER ALIGNMENT
- 5.7.1. DISCRIMINATOR GAIN
- 6. COMPLIMENTARY USER ALIGNMENT
- 6.1. OPTION ALIGNMENT:
- 6.1.1. ANALOG Microphone gain:
- 6.1.2. ANALOG External Mic Gain:
- 6.1.3. Analog AGC
- 6.1.4. DIGITAL AGC
- 6.1.5. MINIMUM VOLUME LEVEL:
- 6.1.6. SQUELCH LEVEL:
- 6.1.7. DISABLE RF POWER
- 7. RADIO APPEARANCE ALIGNMENT
- 7.1. DISPLAYS AND LEDS:
- 7.1.1. Auto backlight delay alignment:
- 7.1.2. Power on Text:
- 7.1.3. Leds:
- 7.2. Tones
- 7.3. ANNUNCIATION
ST-3118C SM R 1.1 SMARTRUNK SYSTEMS, INC.
12
5. ST-3118 ALIGNMENT
5.1. Introduction
The ST-3118 series is carefully
aligned at the factory for the
specified performance across the
frequency range depending for each
version. Realignment should
therefore not be necessary except in
the event of a component failure, or
altering version type.
All component replacement and
service should be performed only by
an authorized SmarTrunk
representative, or the warranty
policy may be void.
The following procedures cover the
sometimes critical and tedious
adjustments that are not normally
required once the transceiver has
left the factory.
However, if damage occurs and
some parts subsequently are
placed, realignment may be
required. If a sudden problem
occurs during normal operation, it
is likely due to component failure;
realignment should not be done
until after the faulty component has
been replaced.
We recommend that servicing be
performed only by authorized
SmarTrunk service technicians
who are experienced with the
circuitry and fully equipped for
repair and align. Therefore, if a fault
is suspected, contact the dealer
from whom the transceiver was
purchased for instructions
regarding repair. Authorized
Smartrunk service technicians
realign all circuits and make
complete performance checks to
ensure compliance with factory
specifications after replacing any
faulty components.
Those who do undertake any of the
following alignments are cautioned
to proceed at their own risk.
Problems caused by unauthorized
attempts at realignment are not
covered by the warranty policy.
In addition, SmarTrunk reserves
the right to change circuits and
alignment procedures in the
interest of improved performance,
without notifying owners.
Under no circumstances should
any alignment be attempted unless
the normal function and operation
of the transceiver are clearly
understood, the cause of the
malfunction has been clearly
pinpointed and any faulty
components replaced, and
realignment determined to be
necessary.
5.2. ALIGNMENT:
The following test equipment (and
thorough familiarity with its correct
use) is necessary for complete
realignment. Correction of
problems caused by misalignment
resulting from use of improper test
equipment is not covered under the
warranty policy.
While most steps do not require all
of the equipment listed, the
interactions of some adjustments
may require that complex
adjustments be performed
afterwards. Do not attempt to
perform only a single step unless it