Issue 2
1
947933
V-9933A
NOISE SENSING VOLUME CONTROL
GENERAL
The V-9933A is designed to electronically adjust the
level of a page by monitoring ambient noise levels in
an area of a building.
SPECIFICATIONS
Purpose
The V-9933A provides automatic paging level
adjustments in areas where ambient noise levels are
continuously changing.
Application
•
Valcom one-way paging systems
Features
•
Solid-state design
•
Low power requirements
•
Self-contained or optional remote sensing device
Capacity
Each V-9933A will control the audio for up to 150
Valcom one-way amplified speaker assemblies in a
single zone. Multiple V-9933A units can be used
within the same zone.
Additional Materials Required
At the time of installation, the installer should provide
the following materials:
•
24VDC power supply (If existing supply is
inadequate)
•
Optional V-9934, Remote Sensing Device (Up to 4
units)
Dimensions/Weight
The V-9933A is designed to be wall mounted.
•
7.30" H x 4.50" W x 2.00" D
(18.54cm H x 11.43cm W x 5.08cm D)
•
0.9 lbs. (.41kg)
Power Requirements
Power Requirement: -24VDC Filtered Battery
Operating Current:
150mA
Nominal Specifications
Automatic Level Adjustment Range:
See Chart 1
Power Output:
-10dBm
Frequency Response:
50-12kHz +3dB
Input Impedance:
25k Ohms
Output Impedance:
8 Ohms
Operating Temperature:
0 to +50 degrees C
Power Requirements:
-24VDC signal battery
Monitor Reset:
5 seconds
OPERATION
The V-9933A, Noise Sensing Volume Control,
continuously monitors the surrounding area noise by
utilizing a built-in or optional remote microphone.
When a page is made, the V-9933A electronically locks
onto the last area noise sample. A -23dBm signal or
higher is required on the input before the
V-9933A will activate and lock.
Once activated, the amplifier is automatically set to the
proper gain level for the amount of background noise.
The amplifier will remain locked at that gain level for
the duration of the page.
After the page is made, there is a five (5) second delay
before the V-9933A starts monitoring the area noise
levels. Refer to Figure 3 for a simplified schematic of
the V-9933A.
INSTALLATION
These instructions cover only the installation
procedure of the Valcom V-9933A. Please consult
