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-3118V SM R 1.1 SMARTRUNK SYSTEMS, INC.
13
is clearly isolated electrically from
all other steps. Have all test
equipment ready before beginning,
and follow all of the steps in a
section in the order presented.
5.3. Required Test Equipment
RF Signal Generator with
calibrated output level at 1
GHz
Deviation Meter (linear
detector)
In-line Wattmeter with 5 %
accuracy at 1 GHz
50 Ohm RF Dummy Load
with power rating 10W at 1
GHz
8 Ohm AF Dummy Load
(Attention: Audio output is
BTL output)
Regulated DC Power Supply
(standard 13.8 V DC, 15 A)
Frequency Counter with 0.2
ppm accuracy at 1GHz
Audio Generator
AC Voltmeter
DC Voltmeter
UHF Sampling Coupler
IBM PC / compatible
Computer with Microsoft®
Windows® XP or later
operating system
SmarTrunk SDR
Programming software
(version 1.0.2 or later)
USB A/B Programming Cable
5.4. Alignment Procedure
Alignment Preparation &
Precautions
A 50-Ohm RF Dummy Load and in-
line wattmeter must be connected
to the main antenna jack in all
procedures that request for
transmission, except where
specified otherwise. Correct
alignment is not possible with an
antenna.
After completing one-step, read the
following step to determine whether
the same test equipment will be
required. If not, remove the test
equipment (except dummy load and
wattmeter, if connected) before
proceeding.
Correct alignment requires that the
ambient temperature be the same
as that of the transceiver and test
equipment, and that this
temperature be held constant
between 68°F and 86 °F (20°C ~ 30
°C). When the transceiver is
brought into the shop from hot or
cold air, it should be required to
wait few minutes to come to room
temperature before alignment.
Whenever possible, alignments
should be made with oscillator
shields and circuit boards firmly
affixed in place. In addition, the test
equipment must be thoroughly
warmed up before beginning.
Note: Signal levels in dB referred to
in the alignment procedure are
based on 0 dBm EMF = 1 mV.
5.4.1. GENERAL ALIGNMENT
CONSIDERATIONS:
Evenly if the radio is powered off,
the alignment software will detect
it, but some of the test cannot be
performed correctly.