Service manual

INTRODUCTION
1-12
March 2000
Part No. 001-3139-502
PROCEDURE 1
Necessary equipment:
• RF Signal Source capable of internal modulation of
1 kHz tone.
• RF Signal Analyzer capable of measuring deviation
of an RF signal.
• Transmission Test Setup
• Multi-Net portable equipped with a DTMF keypad.
This test procedure can be used to verify system
performance, but is not
recommended for system
setup.
1. Bring up a dispatch call using a Multi-Net portable
equipped with a DTMF keypad.
2. Adjust a communications service monitor to the
RDM receiver frequency (transmit frequency of the
portable). Verify that the Low Speed Data Devia-
tion is approximately 1 kHz (800 Hz for 900 MHz
systems).
NOTE: This assumes that no audio or background
noise is being transmitted by the portable. Adjust the
portable per the product service manual if the devia-
tion is not correct.
3. Press and hold the "5" key on the portable. Verify
on the communications service monitor that the
measured deviation of the portable is now approxi-
mately 2.5 kHz (1.6 kHz for 900 MHz). Adjust the
portable per the product service manual if the devi-
ation is not correct. Release the "5" key on the por-
table and take down the call.
NOTE: 800 MHz radios - 1 kHz Low Speed Data and
1.5 kHz for the DTMF tone. 900 MHz systems - 800 Hz
Low Speed Data and 800 Hz for the DTMF tone.
4. Adjust the communications service monitor to the
transmitter site frequency (receive frequency of the
portable).
5. Bring up a dispatch call using a Multi-Net portable
equipped with a DTMF keypad.
6. Verify that the Low Speed Data deviation from the
transmitter site is approximately 1 kHz (800 Hz for
900 MHz).
NOTE: This assumes that no audio or background
noise from the portable is being received and then re-
transmitted.
7. If the Low Speed Data is not at 1 kHz (800 Hz for
900 MHz) of deviation, refer to the repeater service
manual for proper adjustment.
8. Press and hold the "5" key on the portable. Verify
on the communications service monitor that the
measured deviation of the transmit site signal is
now approximately 2.5 kHz (1.6 kHz for 900 MHz).
Release the "5" key on the portable and take down
the call.
NOTE: 800 MHz systems - 1 kHz Low Speed Data and
1.5 kHz for the DTMF tone. 900 MHz systems - 800 Hz
Low Speed Data and 800 Hz for the DTMF tone.
9. If the composite deviation is not 2.5 kHz (1.6 kHz
for 900 MHz), adjust U44 on the RVM (see Step 10)
to attain 2.5 kHz (1.6 kHz for 900 MHz). Refer to
NOTE 2 on page 1-11.
10.Connect a Transmitter Test Set to W6 of J701 on the
MLM drawer and record this meter reading for
Voice Level from Switch alignment.
(Voice Level is ____________)
PROCEDURE 2
Necessary equipment:
• Two personnel will generally be required to perform
this setup.
• Multi-Net/LTR Signaling Encoder-Decoder
(PN023-3039-360), i.e. MED box.
• RF Signal Source capable of simultaneous internal
and external modulation. Internal modulation
source frequency range of 10 Hz to 10 kHz.
• RF Signal Analyzer capable of measuring deviation
of an RF signal.
1. Transmitter Site - Disconnect the transmit antenna
from the repeater and connect to a Signal Analyzer
(with the appropriate pads). Adjust the signal ana-
lyzer to the transmit frequency and set up for a devi-
ation measurement.