8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 67 of 153
Field Name
Options
/ Units
Description
Notes
R-Tx Pwr
30-39
dBm
Specifies the selected Tx Output
Power at the DVR Antenna Port
when the DVR transmits on its Rx
frequency to other DVRs.
Refer to the
Primary /Secondary
Operation
Paragraph for more
details.
The Duplexer Rx Insertion Losses
as entered in the
Interface to
Mobile Setup
screen are
compensated by the DVR PA
Output to produce the
programmed Tx Power at the
Antenna Port.
CCT
0-60 min
Continuous Carrier Timer
–
specifies the maximum time a DVR
can be transmitting before its Tx
function is disabled. If the CCT is
set to 0 (OFF), the DVR operates in
continuous duty mode.
Does not affect Telephone
Interconnect Calls. Phone calls
have a separate CTT programmed
in the Digital System Setup.
ON/OFF Trigger
RSSI
Squelch
Sq&RSSI
Analog Mode
– any ON/OFF trigger
can be selected.
Digital Mode
– RSSI only allowed.
Mixed Mode
– RSSI only allowed.
Squelch is invalid setting in Digital,
F. Analog or Mixed Mode DVR
Channels.
RSSI Thresh
-50 to
-127dBm
Default Setting is -115dBm.
The Duplexer Rx Insertion Losses
as entered in the
Interface to
Mobile Setup
screen are taken
into account to calculate the RSSI
at the Antenna Port.
Busy Lc Th
-65 to
-105 dBm
Threshold used during the dynamic
Busy Lockout Phase if
Primary /
Secondary Enable BL for Voice
Comm
is enabled (see
Digital
Mode Settings
menu).
Refer to the
Primary /Secondary
Operation
Paragraph for more
details.
Rx NID (h)
Hex #
Must match the P25 PSU Tx NID.
Serves as CAS validation in Digital
Mode (equivalent to Rx PL/DPL in
Analog Mode).
F7E Enables the DVR to receive
on any NID.
Applies to Digital, Mixed and
F.Analog Mode.
Tx NID (h)
Hex #
Must match the P25 PSU Rx NID.
Serves as CAS validation in Digital
Mode (equivalent to Tx PL/DPL in
Analog Mode).
Applies to Digital, Mixed and
F.Analog Mode.
Tx RSSI Th
-60 to
-110dBm
When a Secondary DVR detects a
request for DVR repeat and it does
not detect any Heart Beats coming
from the current Primary DVR, the
Secondary DVR checks for activity
on its Tx frequency (exceeding the
Tx RSSI Th) to determine if the lack
of Heart Beat is due to the Primary
DVR already repeating the Call. If
no activity is found to exceed the
Tx
RSSI Th
the DVR will check again
and if 3 heart beats are missed, the
DVR will negotiate becoming a
Primary.
Refer to the
Primary /Secondary
Operation
Paragraph for more
details.
