Ericsson LBI-39175A - Manual (Page 10)

LBI-39175A
10
SETTING TRACKING DATA
Normally, Tracking Data is set at the factory, and need not be re-loaded. However, the following repair situations
require re-loading some or all of the Tracking Data:
SITUATION NEW TRACKING DATA
Replace PA module RF Power, Squelch (Check: Re-load if necessary.)
Replace TXRX module RF Power, Modulation Deviation, Squelch, Feature
Encryption, and Data Offset
Replace Control Unit module None
Replace Synthesizer PWB Modulation Deviation and Data Offset
Replace Logic PWB RF Power, Squelch, Modulation Deviation, Feature
Encryption, and Data Offset.
To re-load Tracking Data, connect the radio in
the appropriate configuration as shown in Figures 2 and 3,
and perform the following steps:
1. Using the PC Programming Software , make sure the
radio is programmed in the following sequence:
a. Customer Operational Software (if necessary)
b. Tracking Data (First Iteration -- Tracking Data
originally shipped with the radio is a good
starting point.)
c. Feature Encryption File (if necessary). Note: In
order to load an Encryption File into a new
Logic PWB, After Market Services must first be
contacted at 1-800-368-3277 for authorization
code. Otherwise the file will not load.
d. Personality, which contains a Conventional
System using the frequencies given in Tables 2
and 3.
2. Connect the radio unit in the normal operating
configuration. Activate the radio unit, and, using a
Service Monitor HP8920A or equivalent, measure the
Transmitter Power, Modulation Deviation, and
Squelch Threshold for each of the applicable
frequencies given in Tables 2 and 3. Measurements
should be within the following limits:
Parameter Limit
TX Modulation Deviation
30 kHz channel spacing
4.4
±
0.1 kHz
12.5 kHz channel spacing 2.25
±
0.1 kHz
TX High Power 110 W Model 110 +4, -0 W
50 W Model 50 +2, -0 W
25 W Model 25 +0, -1 W
TX Mid Power 25 W Model 15 +.5, -.5 W
TX Low Power 110 W Model 55 +2, -0 W
50 W Model 25 +1, -0 W
25 W Model 6 +.5 -.5 W
RX Squelch Threshold 8 +1, -0 dB
SINAD
3. If measurements are within the limits, the job is
complete. If the measurements are not within the
limits stated, re-connect the Programming
Maintenance Software "MRKMAINT." Display the
Tracking Data screen. For those frequencies where
measurements are not within the stated limits, enter
new Tracking Data, following instructions on the
screen. Program into the radio personality, and exit.
4. Repeat Steps 2 and 3 until the measurements at every
frequency given in Tables 2 and 3 are within the
limits specified.