VSP-V-9939A
Issue 8
1
947939A
V-9939A
MICROPHONE ADAPTOR
INTRODUCTION
These instructions provide identification, installation,
connection, operation, and maintenance information
for the V-9939A, Microphone Adaptor.
The V-9939A is a Microphone Adaptor 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 ohm 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
•
Screw terminals for all connections
Capacity
Each V-9939A may be connected to one zone of a
paging system.
Dimensions/Weight
•
7.1”H x 4.7”W x 2.1"D
(18.03 cm H x 11.94 cm W x 5.33 cm D)
0.7lbs. (32kg)
Power Requirements
–21.5 to –26 Vdc filtered "A" Battery, 40 ma. max
Environment
Temperature:
0 to 50 Degrees 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
SYSTEM DESIGN
Configuration
There are two basic ways the V-9939A Microphone
adaptor may be used:
1.
It may be used with a V-1094A and Valcom
one-way amplified speaker assemblies as a
stand alone paging system.
When using the V-9939A for access to a stand alone
paging system, the following will be required:
•
1 V-9939A Microphone Adaptor
•
1-Microphone (push to talk)
•
1 V-1094A Booster Control
