Valcom v-9939b Service Manual
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.
Issue 10
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
1 947939
SYSTEM DESIGN
s
Configuration
There are two basic ways the V-9939B
Microphone Adapter 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-9939B to override an existing
zone of telephone accessed one-way paging, the
following will be required:
• 1 V-9939B Microphone Adapter
• 1-Microphone (push to talk)
• 1 V-2001A One Zone Page Control
OR
• An existing Valcom one-way page system
When using the V-9939B for access to a stand
alone paging system, the following will be
required:
• 1 V-9939B Microphone Adapter
• 1-Microphone (push to talk)
• 1 V-1094A Booster Control
• Valcom one-way amplified speaker
assemblies (type determined by job
requirements)
• Power Supply (type determined by style and
quantity of speakers - Consult the Valcom
One-Way Paging VSP for more information)
2. By using the V-9939B with a V-2001A
One Zone Page Control you may
automatically disconnect the speakers of
one zone from a multi-zone page
adapter and allow microphone access to
that zone. These configurations will
allow the microphone to override the
telephone access.
NOTE: These will work only on a zone of
ONE-WAY paging.
Amplified Speaker
V-9939B V-1094A
Other configurations are possible. Contact
Technical Support (540) 563-2000 with
questions on specific applications.
Microphone Requirements
A standard high impedance (50,000 Ohms) or
low impedance balanced (600 Ohms)
microphone may be used. The microphone will
be required to provide a dry contact closure
(push to talk) for page access.
See Figure 3 for connections to Valcom
V-400/450 or V-420 Microphones.
INSTALLATION
These instructions cover the installation
procedures for the Valcom V-9939B and any
associated Valcom equipment. Please consult
practices for other manufacturer's equipment if
any other equipment is being used. Refer to
Figure 2 for location of connector connections
and designations.
The following sections contain step-by-step
instructions for wiring the V-9939B and
associated Valcom equipment. Place a check
on the appropriate line as the instruction is
completed. The instructions also include tests
along the way to verify connections have been
made correctly. If these steps are followed
exactly, installation of your Valcom system will
go smoothly and quickly. If the results of a test
do not correspond with what is shown, DO NOT
PROCEED UNTIL THE PROBLEM HAS BEEN
CORRECTED.
NOTE: During initial system setup it is
recommended that all volume controls be set
1/2 turn clockwise.
Power
Supply
FIGURE 1 – BLOCK DIAGRAM OF A TYPICAL INSTALLATION
Mounting
• Using two #6 ¾ inch wood screws, mount
the unit in a convenient location near the
microphone location
NOTE: DO NOT locate the V-9939B closer
than 18 inches to a power supply or any
equipment that generates electrical noise.
2
Loading...