Service manual

INTRODUCTION
1-10
March 2000
Part No. 001-3139-502
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. On the RVM, if the composite deviation is not
2.5 kHz (1.6 kHz for 900 MHz), adjust U44 (see
Step 10) to attain 2.5 kHz (1.6 kHz for 900 MHz).
Refer to NOTE 2 on Page 1-9.
10.On the MLM drawer connect a Transmitter Test
Set to W6 of J701 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 setup for a devi-
ation measurement.
2. RDM Site - Connect the MED box to the Signal
Source as described in the MED box operation and
service manual. Set the MED box parameters to the
desired system (choose a Group ID that is not cur-
rently active by other system users).
3. RDM Site - Connect the Signal Source to the Signal
Analyzer (monitor function for a communications
service monitor). Adjust the output level of the Sig-
nal Source to the required input level of the Signal
Analyzer. Enable the internal modulation source
and set the modulation frequency to 1 kHz at
1.5 kHz deviation (800 Hz for 900 MHz) and verify
with the Signal Analyzer that the deviation is
correct.
4. RDM Site - Disable the internal modulation source
without changing the deviation setting. Enable the
external modulation port. Adjust the MED box to
encode the Multi-Net data. Adjust the data out level
of the MED box to achieve 1 kHz (800 Hz for
900 MHz) of deviation as measured on the Signal
Analyzer.
5. RDM Site - Enable the internal modulation source
with a 1 kHz tone. The composite deviation will
now measure 2.5 kHz (1.6 kHz for 900 MHz) on the
Signal Analyzer.
NOTE: 800 MHz systems - 1 kHz Low Speed Data and
1.5 kHz for the 1 kHz tone. 900 MHz systems - 800 Hz
Low Speed Data and 800 Hz for the 1 kHz tone.
6. RDM Site - Adjust the Signal Source to 100 µV of
RF level. Connect the Signal Source to the RDM
"ANT1" antenna port (S1 should still be set to
"ANT1").
7. RDM Site - A dispatch call should now be set up. If
not, check the MED box to be sure that the Multi-
Net data is being encoded and the correct Multi-Net
parameters are being sent.
8. Transmitter Site - Record the deviation of the
transmitted signal (it should be 2.5 kHz for 800
MHz systems and 1.6 kHz for 900 MHz systems).
9. RDM Site - Disable the 1 kHz tone on the internal
modulation source of the Signal Source (the exter-
nal port must remain active). The dispatch call
should still be complete.
10.Transmitter Site - At the transmit site record the
deviation of the transmitted signal (it should be
1 kHz of Low Speed Data for 800 MHz and 800 Hz
of Low Speed Data for 900 MHz systems). If the
deviation is not correct, adjust the level to the cor-
rect setting as described in the repeater service
manual.
11. RDM Site - Enable the 1 kHz tone on the internal
modulation source of the Signal Source (the exter-
nal port must remain active). The dispatch call
should still be complete.