Service manual

2000 SERIES RECEIVER DECODER MODULE (RDM)
3-10
March 2000
Part No. 001-3139-502
3.10.5 HARDWARE
Figure 3-19 HARDWARE MENU
Receive/Transmit Data
This is an information screen used at the RDM
site while the computer (laptop) is connected to the
Interface Board of the RDM being monitored. This
information is contained in the data message
exchanged between the RDM and the destination user
(mobile or Switch). The message contains data
received from the destination and data sent to the
mobile by the repeater. The repeater receives the desti-
nation’s: Unique ID, Home Repeater Number, Group
ID, Priority, Status and Time Stamp. This same infor-
mation is sent to the destination in the update message
from the repeater. The time stamp is included because
messages are sent continually and this provides a ref-
erence for when a data exchange took place.
RF Data
The A/D Monitor Screen shows the state of the
lines (see Figure 3-20). These lines are being moni-
tored by the A to D converter on the RDM Interface
board. The normal values for each line are defined as
follows.
Synthesizer Lock Lines Yes or No
Wideband Audio Output approx 200
LO Injection approx 250
RSSI 20-150
NOTE: For an 800 MHz RDM, the Receiver High Sta-
bility RF Line Monitor will indicate a Yes condition.
Values with no label are the actual A to D
reading.
Figure 3-20 RF LINE MONITOR FOR RDM
Synthesizer Lock Lines
Receive Synthesizer: Yes
Receive Parameters
RSSI: 0
Wideband Audio Output: 0
LO Injection: 0
Receive High Stability: Yes
RF Line Monitor for RDM
Figure 3-18 HARDWARE PROGRAMMING FLOWCHART
Data Received From Radio
Data Transmitted to Radio
Home
UID
GID
Pri
Stat
Time
RX/TX Data
HARDWARE
RF Data RF Line Monitor
Mode Select
Normal
Test
Revisions
Receive Synthesizer
Receive High Stability
Wideband Audio Output
LO Injection
RSSI