Issue 10
1
947939
V-9939B
MICROPHONE ADAPTER
INTRODUCTION
These instructions provide identification,
installation, connection, operation and
maintenance information for the V-9939B
Microphone Adapter.
The V-9939B is a Microphone Adapter designed
to be used with Valcom paging equipment.
SPECIFICATIONS
Purpose
•
Provides microphone access to Valcom
one-way amplified speaker assemblies.
Applications
•
Allows local paging access to a zone of
one-way paging speakers
•
Allows paging access to stand alone
systems
Refer to Figure 1 for a block diagram of a typical
installation.
Features
•
600 Ohms balanced and 50,000 Ohms
inputs
•
Works with most microphones with push to
talk switches
•
Built in microphone preamplifier
•
Mounts at microphone location
•
Provides a set of form "C" contacts
•
May be connected to a selected zone of a
multi- zone paging system
•
Connector terminals for all connections
Capacity
Each V-9939B may be connected to one zone of
a paging system.
Dimensions/Weight
•
8.25" H x 4.50" W x 2.35" D
(20.95cm H x 11.43cm W x 5.97cm D)
0.7lbs. (0.32kg)
Power Requirements
-21.5 to -26VDC filtered "A" Battery, 40mA max.
Environment
Temperature:
0 to 50°C
Humidity:
0 to 85% non-precipitating
Nominal Specifications
Input impedance:
600 Ohms balanced
50,000 Ohms unbalanced
Output impedance:
600 Ohms
Output level:
-10dBm nominal
