Specifications

ManualsBrandsValcom ManualsMicrophonesV-9939B

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

Summary of content (6 pages)

PAGE 1
Issue 10 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. Capacity Each V-9939B may be connected to one zone of a paging system.
PAGE 2
When using the V-9939B to override an existing zone of telephone accessed one-way paging, the following will be required: SYSTEM DESIGN 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.
PAGE 3
Power Connections WIRING INSTRUCTIONS (For Figure 3) Place a check by each step as it is completed: ___ 1. Unplug power supply. ___ 2. Connect -24VDC "A" battery (may be referred to as "-" or "talk battery") from power supply to one of the PWR terminals on the V-9939B. ___3. Connect -24VDC Ground ("A" ground, "+" or "talk" ground) from power supply to the other power terminal. This GND should be properly grounded to an earth ground to alleviate hum on the system. ___1.
PAGE 4
VALCOM V-9939B MICROPHONE ADAPTER V-1094A MICROPHONE RING TIP V-450 INPUT STATIONARY BREAK MAKE POWER (-24VDC) POWER (GND) LO Z1 MIC SHIELD LO Z2 HI Z GND OUT SWITCH * V-400 and OUTPUT -24 + VP-624B RED (+) SHIELD BLACK (-) SHIELDED CABLE A/C GND GREEN WHITE + -24 VALCOM V-9939B MICROPHONE ADAPTER MICROPHONE RING TIP V-420 INPUT STATIONARY BREAK MAKE * POWER (-24VDC) POWER (GND) LO Z1 MIC SHIELD LO Z2 HI Z GND OUT SWITCH V-1094A -24 OUTPUT + VP-624B WHITE (+) SHIELD BLACK (-)
PAGE 5
V-2001A SW1 ON BATTERY FEED TIP AND RING PAGE OFF R40 R2 MUSIC VALCOM SW4 RING TIP STATIONARY BREAK MAKE POWER POWER LO Z1 MIC SHIELD LO Z2 HI Z GND OUT SWITCH Microphone V-400/450 TONES SW2 V-9939B MICROPHONE ADAPTER TIP AND RING OVR PAGE TIP PAGE RING MUSIC CLOCK CLOSURE UNA CLOSURE UNA RING PC PAGE W/O MUSIC GND -24VDC PAGE + MUSIC GND -24VDC PAGE + MUSIC GND -24VDC PPCC RED (+) SHIELD BLACK (-) SHIELDED CABLE GREEN WHITE CAT 3/5 CABLE FIGURE 4 – OVERRIDE A SINGLE ZONE WITH A V-2001A
PAGE 6
OPERATION Circuit Description The V-9939B Microphone Adapter has inputs for both high impedance and balanced low impedance microphones. It also has input for a push to talk contact closure. When the closure is applied, a high gain pre-amplifier is turned on and the output relay is activated. The unit will stay active until the contact closure is removed. The preamplifier circuit also contains a voice limiting circuit to limit extremely loud inputs.