Valcom V-9939C User Manual

Issue 1

V-9939C

MICROPHONE ADAPTER

INTRODUCTION

These instructions provide identification,
installation, connection, operation and
maintenance information for the V-9939C
Microphone Adapter.

The V-9939C 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

 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-9939C 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: Low Z or Hi Z
Output impedance: 600 Ohms
Output level: -10dBm nominal

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SYSTEM DESIGN

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Configuration

There are two basic ways the V-9939C
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-9939C for access to a stand
alone paging system, the following will be
required:

 1 V-9939C 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-9939C 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-9939C V-1094A

Power
Supply

FIGURE 1 – BLOCK DIAGRAM OF A TYPICAL INSTALLATION

When using the V-9939C to override an existing
zone of telephone accessed one-way paging, the
following will be required:

 1 V-9939C Microphone Adapter
 1-Microphone (push to talk)
 1 V-2001A One Zone Page Control

OR

 An existing Valcom one-way page system
Other configurations are possible. Contact

Technical Support [phone] 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-9939C 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 connections and
designations.

The following sections contain step-by-step
instructions for wiring the V-9939C 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.

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-9939C closer
than 18 inches to a power supply or any
equipment that generates electrical noise.

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