8G093X01 R5
VR Programming Guide
August 2022 Page 91 of 144
When the DC supply voltage drops
0.5V above the programmed
threshold, a ‘BATTERY LOW’
warning will be displayed, and the
VR will send warning tones to the
portables over the air. If the
voltage drops below the
programmed level, the VR is
disabled and ‘BATTERY LOW’
alternates with ‘VR ERROR’ on
the MSU CH display and the VR
Transmitter is inhibited.
When the battery voltage reaches
0.8 V above the programmed level
the alarm condition is reset and the
VR resumes normal operation.
In most installations the VR is
programmed to be in the OFF
mode upon power up. If not, the
‘Engine Start Alarm’ field may be
enabled to prevent the VR from
transmitting when the voltage
drops below the programmed
threshold during engine start up.
This option may be useful
only in installations where
the VR is programmed to
power up in System or
Local mode. Since the
recommended VR Power
up mode is OFF, this
option is not needed in
most installations.
Enable / Disable
Check box
Bypasses the MSU filter when an
In Band DVRS Disabled channel is
selected
Required for all in-band
applications.
The following
configuration is also
required:
Hardware Setup → Relay
Use → Relay 1 = MSU
RF Bypass Sw.
In some in-band application, the
Band Lock feature may need to be
disabled even though there is no
in-band filter provided with the VR.
The typical application for
Disabling the Band Lock is a Fixed
VR installation where all the
required isolation (min 70dB) is
provided by antenna separation
and no in-band filter is required.
If the ‘MSU RF Bypass
Switch’ option is
enabled, this field is
ignored.
If the ‘MSU RF Bypass
Switch’ option is
disabled, this field
determines the MSU
behavior if the MSU and
VR operate in the same
frequency band.
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