8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 124 of 153
Using the Tweaker’s RSSI Setup Application
The DVRS
RSSI Setup
screen is provided in order to assist the users with optimizing the
voting algorithm parameters by creating a typical real life scenario for DVRS operation
and running some automated DVRS tests as described below.
The RSSI setup screen is used to assist with the setup the following DVRS parameters
on a per channel basis:
•
RSSI ON threshold
•
Busy Lockout Threshold
•
TX RSSI Threshold
•
Rx RSSI Threshold
Setting up the RSSI ON range
The
RSSI ON threshold
defines the DVRS incident range since this is the minimum signal
level the DVR receiver needs to detect from the Local PSU in order to repeat it locally and
to the System.
RSSI ON threshold
is normally programmed to standard -114dBm. However, if the user
wants to test the actual levels received from a portable radio located at the desired
coverage area extreme then the ‘RSSI ON Level Test’ can be performed.
To execute the test, the following steps are to be followed:
1. PSU user is located at the edge of the desired coverage range and the PSU is
switched to the correct channel (matching the channel selected on the DVR).
2. Tweaker is running on the Primary DVRS and Monitoring screen is open as shown
above.
3.
Select ‘System’ or ‘Local’ Mode in the ‘Operating Mode’ Field.
4.
Switch ‘Set Test Mode’ to ON.
5.
Press the ‘RSSI ON Level Test’ button.
6. The PSU User will hear 3 short and 1 long beeps and he/she must immediately
press and hold the PTT for 10 seconds.
7. The DVRS measures the received signal level and updates the RSSI ON
Threshold field. The check box against the parameter is checked to indicate test
completion.
8. Enter desired Margin (min 6dB or higher recommended).
9. Repeat the test for all required channels.
10. Close the monitoring screen or proceed with the Voting algorithm tests as
described below.
11.
Review the ‘RSSI ON Threshold’ levels on the ‘Repeater Channel setup’ screen
and save to the DVRS and in a dpd file as required.
