Service manual

ManualsBrandsE.F. Johnson Company ManualsGadgetsMULTI-NET II

INTRODUCTION

1-13

March 2000

Part No. 001-3139-502

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

antenna port.

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 external

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 external

port must remain active). The dispatch call should

still be complete.

12.Transmitter Site - At the transmit 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). If the deviation is not correct,

adjust U44 in the RVM (see Step 10) to attain

2.5 kHz deviation for 800 MHz systems and

1.6 kHz deviation for 900 MHz systems. Refer to

NOTE 2 on page 1-11.

13.Voter Site - On the MLM drawer connect a Trans-

mitter Test Set to W6 of J701 and record this meter

reading for Voice Level from Switch alignment.

(Voice Level _____________)

1.3.4 VOICE LEVEL TO SWITCH ALIGNMENT

1. Set S2 switches in the MLM drawers as shown in

Figure 1-17 and reset the MLM. This enables the

Receive Audio Gate and Logic Squelch Gate.

Figure 1-17 MLM S2 GATE SETTINGS

2. On the MLM drawer connect a Transmission Test

Set to TP2 and adjust R202 for a meter reading of

-12 dBm. (See Figure 1-23.)