Service manual

ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
7-2
April 2001
Part No. 001-9800-203
In the test mode, test channels and various modu-
lation signals can be manually selected. The test chan-
nels are either default channels or others can be
programmed as described in Section 4.6.2. For a
complete description of test mode features and opera-
tion, refer to Section 3.11.
7.1.3 TEST SETUP
Connect the test setup shown in Figure 7-1. The
following is additional information on equipment in
this setup.
RF Signal Generator - When connecting the gener-
ator to the antenna jack, use at least a 6 dB pad
between the generator and transceiver. This protects
the generator in case the transmitter is accidentally
keyed and also ensures that a 50-ohm load exists. The
generator output levels in the following procedure are
input levels into the transceiver, not into a 6 dB pad.
Power Supply - It must provide at least 15 amperes
with 30 and 40 watt models and 7 amperes with 15 and
25 watt models. The input voltage must be 13.6 VDC
at the transceiver
.
Wattmeter/Load - Must be capable of measuring and
dissipating up to 50 watts.
Audio Generator - The RPI has a miniature phone
jack (similar to the transceiver external speaker jack)
for connecting the transmit audio signal.
Speaker Load - It should be 4.7 ohms and capable of
dissipating at least 5 watts.
NOTE: The speaker outputs are floating. Therefore,
make sure any meter connected across the speaker
load has floating inputs. (Although the audio amplifier
is internally protected from damage caused by
shorting either output to ground or B+, doing so
should be avoided.)
Ignition Sense - If the transceiver is equipped with the
optional accessory pigtail and senses the ignition
switch, the ignition sense input must be connected to
13.6 VDC for the transceiver to operate. Refer to
Section 2.4 for more information.
Computer and RPI - The RPI is connected to the
computer and transceiver as described in Section
4.1.6.
7.2 USING TUNE SOFTWARE
7.2.1 GENERAL
NOTE: Tuning software Version 203 or later is
required to tune LTR-Net upgradable models running
Version 209 or later operating software (the version
number is displayed briefly on the opening screen).
Refer to Appendix C for more information.
The special Tune software listed in Table 1-3 of
Section 1 is required to perform most adjustments in
this section. The only adjustments that could be
performed without this software are the manual adjust-
ments described in Sections 7.3.2 and 7.3.8.
The Tune program is a relatively small DOS
program and therefore can be run on computers which
may have limited memory or processor power (by
today’s standards). However, at least MS-DOS 5 and a
286 processor are required as described in Section
4.1.2. If your computer is equipped with Windows 3.x,
95, or NT, it may run properly under that operating
system. If it does not, run it in the DOS mode.
7.2.2 INSTALLATION
The Tune program comes uncompressed on a
single floppy disk. The file is called PLATTUNE.
EXE and it is about 400K in size. No other files are
required with this program. To install this software on
your hard drive, use the procedure in Section 4.2.3 as a
general guide. The program defaults to serial port 1
(COM1). If the RPI is connected to serial port 2
instead, it must be changed in the program as
described in the next section.
7.2.3 PROGRAM OPERATION
To start the program from DOS, make the direc-
tory of the program the current directory and type
PLATTUNE. From Windows 95, double click the
shortcut icon for the program if one has been created.
The opening screen is shown in Figure 7-2. Use the
arrow keys or the indicated number keys to highlight
the desired function and then select it by pressing the