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

1 947476

SYSTEM DESIGN

s

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.

2 947476

Power Connections

___ 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-9939C.

___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.

Connecting Arrangements

NOTE: Place a check by the Arrangement
being used and proceed to the Figure
indicated for step-by-step instructions.

___1. Stand alone page system: Proceed to

Figure 3.

___2. Override an individual zone using a

V-2001A: Proceed to Figure 4.

Figure 2 - Location and Connection
Designations

R8

Volume
Control

V-9939C

} 24 VDC

POWER (+)

POWER (-)

MIC SHIELD

LO Z2

LO Z1

HI Z

SWITCH

GND OUT

STATIONARY

BREAK

MAKE

RING

TIP

WIRING INSTRUCTIONS (For Figure 3)

Place a check by each step as it is completed:
___1. Mount the V-1094A near the V-9939C or

at the main frame.

___2. Connect Tip of the V-9939C to Tip of the

V-1094A input.

___3. Connect Ring of the V-9939C to Ring of

the V-1094A input.

___4. Connect Tip of the V-1094A output to

the Tip side of all the one-way amplified
speaker assemblies.

___5. Connect Ring of the V-1094A output to

the Ring side of all the speakers.

___6. Connect the microphone:

___a. Connect the audio common lead

shield from the microphone to the MC
terminal of the V-9939C.

___b. Connect the other microphone audio

lead to HZ if using a high impedance
microphone; if using a low impedance
balanced microphone, connect (+)
lead to LZ1 and the (-) lead to LZ2.

___c. Connect one side of the microphone

push to talk switch to the V-9939C SW
terminal.

___d. Connect the other side of the push to

talk switch to the GND OUT terminal.

___7. Connect -24VDC from the power supply

to the -24VDC terminal of the V-1094A.

___8. Connect Ground (+) of the power supply

to the Ground terminal of the V-1094A.

___9. Connect -24VDC from the power supply

to the -24VDC terminal (or the white
lead) of each speaker assembly.

___10. Connect Ground of the power supply to

the Ground terminal (or the black lead)

of each speaker assembly.
___11. Plug in the power supply.
___12. Volume adjustment:

___ a. Set the V-1094A volume control to 5.
___ b. Verify all speaker controls are set at

1/2.

___ c. Speak through the microphone and

adjust the V-1094A for the proper
system level.

___ d. Speak through the microphone and

adjust the individual speakers to the
required levels.

3 947476

VALCOM

V-9939C

MICROPHONE ADAPTER

V-400

*

and

V-450

MICROPHONE

POWER (-24VDC)

LO Z1

HI Z

LO Z2

SWITCH

GND OUT

MIC SHIELD

POWER (GND)

TIP

RING

STATIONARY

BREAK

MAKE

V-1094A

INPU T

-24

OUTPUT

+

VP-624D

(+)

( -)

SHIELDED
CABLE

RED (+)
SHIELD
BLACK (-)
GREEN
WHITE

VALCOM

V-9939C

MICROPHONE ADAPTER

V-1094A

V-420

*

MICROPHONE

POWER (-24VDC)

POWER (GND)

LO Z1

HI Z

MIC SHIELD

LO Z2

SWITCH

GND OUT

STATIONARY

BREAK

MAKE

TIP

RING

INPU T

OUTPUT

-24

+

SHIELDED
CABLE

WHITE ( +)
SHIELD
BLACK (-)
RED
GREEN

VP-624D

(+)

( -)

*NOTE: V-400/450 and V-420 Microphones are wired differently. See correct diagram above.

FIGURE 3 – STAND ALONE PAGE SYSTEM

4 947476

VALCOM

V-9939C

MICROPHONE ADAPTER

Microphone

POWER

POWER

LO Z1

SWITCH

GND OUT

HI Z

LO Z2

MIC SHIELD

STATIONARY

BREAK

V-400/450

RED (+)
SHIELD
BLACK (-)
GREEN

SHIELDED

WHITE

CABLE

FIGURE 4 – OVERRIDE A SINGLE ZONE WITH A V-2001A

WIRING INSTRUCTIONS (For Figure 4)

Place a check by each step as it is completed:
___ 1. IMPORTANT: Complete installation and

testing of your page control unit and
speakers before adding the microphone
adapter.

___ 2. Mount the V-2001A near the microphone

adapter.

___ 3. Connect Tip of the V-9939C to PAGE

TIP.

___ 4. Connect Ring of the V-9939C to PAGE

RING.

___ 5. Connect the GND of the V-2001A to

terminal STATIONARY on the
microphone.

___ 6. Connect the PPCC of the V-2001A to

terminal MAKE of the microphone
adapter.

___ 7. Disconnect Tip of the audio pair to the

speakers on the zone being overridden
from the Page Control unit and connect
it to the PAGE + MUSIC of the V-2001A.

___ 8. Disconnect Ring of the audio pair to the

speakers from the Page Control unit and
connect it to the PAGE + MUSIC of the
V-2001A.

____9. Connect the MUSIC INPUT of the

V-2001A to one side of the output pair
from the page control unit for the zone
to be overridden.

___10. Connect the MUSIC INPUT of the

V-2001A to the other side of the output

V-2001A

ON

TIP

RING

MAKE

SW1

R2

R40

SW2

SW4

BATTERY

FEED

OFF

MUSIC

TONES

PAGE TIP

PAGE RING

MUSIC

CLOSURE

CLOSURE

UNA

RING

PC

PAGE W/O

MUSIC

-24VDC

PAGE +

MUSIC

-24VDC

PAGE +

MUSIC

-24VDC

PPCC

CLOCK

UNA

GND

GND

GND

TIP
AND
RING
PAGE

TIP
AND
RING
OVR

CAT 3/5
CABLE

pair from the page unit for the zone
being used.

___11. Connect the microphone:

___a. Connect the audio common lead

shield of the microphone to the MC
terminal of the V-9939C.

___b. Connect the other microphone audio

lead to HZ if using high impedance
microphone; if using a low impedance
balanced microphone, connect (+)
lead to LZ1 and the (-) lead to LZ2.

___c. Connect one side of the microphone

push to talk switch to the V-9939C SW
terminal.

___d. Connect the other side of the push to

talk switch to the GND OUT terminal.

___12. Connect -24VDC filtered talk battery

from the V-2001A to the power of the
V-9939C.
___13. Connect Ground (+) of the V-2001A to

the power of the V-9939C.
___14. Volume adjustment:

___a. Speak through the microphone and

adjust the V-9939C volume control
adjustment for the proper page level.

5 947476

OPERATION

Circuit Description

The V-9939C Microphone Adapter input is 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.

TECHNICAL ASSISTANCE

When trouble is reported, verify that power is
being supplied to the unit and there are no
broken connections. Check voltages for proper
polarity on the cross connect block.

Table 1 identifies symptoms of some possible
problems with solutions. If a spare unit is
available, continue to troubleshoot by

substituting the spare unit for the suspected
defective unit.
Assistance in troubleshooting is available from
the factory. When calling, you should have a
VOM, a test set available and call from the job
site. Call [phone] and press 1 for
Technical Support or visit our website at
http://www.valcom.com.

The V-9939C is not field repairable. Valcom

equipment contains no user serviceable
parts inside. Valcom, Inc. maintains service

facilities in Roanoke, VA. Should repairs be
necessary, attach a tag to the unit clearly stating
your company name, address, phone number
and contact person and the nature of the
problem.
Send the unit to:

Valcom, Inc.

Repair and Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

TABLE 1 - TROUBLESHOOTING CHART

SYMPTOM

1. No relay operation in V-9939C
when microphone talk button is
pressed.

2. Relay operation but no output.

3. Audio from V-9939C but not from
V-1094A.

4. No output from V-2001A.

5. Output from V-9939C and
V-1094A or V-2001A but not
from speakers.

SOLUTION
Check for -24VDC at V-9939C across the PWR terminals. Verify
connection from microphone to terminals SW and GND OUT (refer to the
Installation section).

Verify connections from microphone to MC and HZ or LZ terminals. Turn
volume control up (clockwise).

Verify Tip and Ring connections from V-9939C to V-1094A. Verify proper
voltage and polarity at -24VDC and GND terminals of V-1094A. Turn up
volume at V-1094A.

Recheck all connections per Figure 4. Make sure the V-2001A passes the
power test in Figure 4, step 16.

Verify proper voltage and polarity to speakers. Verify audio connections to
speakers. Verify speakers are Valcom one-way amplified speaker
assemblies.

Valcom, Inc. warrants its products only to t he original purchaser, f or its own use, to be free from defects in materials and workmanship under conditions of
normal use and service for a period of one year from the date of shipment. This Limited Warranty obligation shall be limited to the replacement, repair or
refund of any such defective device within the warranty period, provided that:

1. inspection by Valcom, Inc. indicates the validity of the claim;

2. the defect is not the result of damage, misuse or negligence after the original shipment;

3. the product has not been altered in any way or repaired by others and that factory sealed units are unopened (a service charge plus parts
and labor will be applied to units defaced or physically damaged);

4. freight charges for the return of products to Valcom are prepaid;

5. all units 'out of warranty' are subject to a service charge. The service charge will cover minor repairs (major repairs will be subject to
additional charges for parts and labor).

This Limited Warranty is in lieu of and excludes all other warranties, expressed or implied and in no event shall Valcom, Inc. be liable for any
anticipated profits, consequential damages, loss of time or other losses incurred by the buyer in connection with the purchase, operation,
maintenance, installation, removal or use of the product. The maximum liability of Valcom under this warranty is limited to the purchase price of the
specific Product covered by the warranty.

Disclaimer. Except for the Limited Warranty provided herein, the product is provided “as-is” without any warranty of any kind whatsoever including, without

limitation, any WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.
This warranty specifically excludes damage incurred in shipment. In the event a product is received in damaged condition, the carrier should be notified

immediately. Claims for such damage should be filed with the carrier involved in accordance with the F.O.B. point.

VALCOM LIMITED WARRANTY

Headquarters:

Valcom, Inc.

5614 Hollins Road Roanoke, VA 24019-5056

Phone: [phone] FAX: [phone]

6 947476