SmarTrunk Systems ST-9116C, Service Manual, Page: 15 / 67

ST-9116C SM R 1.1 SMARTRUNK SYSTEMS, INC. 15
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 SDRe
Programming software
(version 1.0 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 TX 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 repeater and test
equipment,
and that this
temperature be held constant
between 68°F and 86 °F (20°C ~ 30
°C). When the repeater 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:
Please be sure you turn the
repeater on before continue with
this alignment procedure.