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
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-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.
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
Volume
Control
V-9939B
STATIONARY
BREAK
MAKE
RING
SWITCH
POWER
POWER
J3 J2 J1
LO Z1
GND OUT
MIC SHIELD
HI Z
LO Z2
TIP
WIRING INSTRUCTIONS (For Figure 3)
Place a check by each step as it is completed:
___1. Mount the V-1094A near the V-9939B or
at the main frame.
___2. Connect Tip of the V-9939B to Tip of the
V-1094A input.
___3. Connect Ring of the V-9939B 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-9939B. (This shield
should be strapped to power supply
GND).
___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-9939B 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. Turn the screwdriver adjustable
volume control on the V-9939B about
1/2 of the way clockwise.
___ c. Verify all speaker controls are set at
1/2.
___ d. Speak through the microphone and
adjust the V-1094A for the proper
system level.
___ e. Speak through the microphone and
adjust the individual speakers to the
required levels.
3
VALCOM
V-9939B
MICROPHONE ADAPTER
V-1094A
V-400
*
and
V-450
MICROPHONE
SHIELDED
CABLE
RED (+)
SHIELD
BLACK (-)
GREEN
WHITE
POWER (-24VDC)
POWER (GND)
LO Z1
MIC SHIELD
LO Z2
HI Z
GND OUT
SWITCH
VALCOM
V-9939B
MICROPHONE ADAPTER
STATIONARY
INPUT
OUTPUT
-24
+
RING
MAKE
TIP
BREAK
VP-624B
A/C
+
GND
-24
V-1094A
INPUT
OUTPUT
V-420
*
MICROPHONE
POWER (-24VDC)
POWER (GND)
LO Z1
GND OUT
LO Z2
MIC SHIELD
HI Z
SWITCH
STATIONARY
RING
TIP
MAKE
BREAK
-24
+
VP-624B
WHITE (+)
SHIELD
SHIELDED
BLACK (-)
RED
GREEN
A/C
GND
+
CABLE
*NOTE: V-400/450 and V-420 Microphones are wired differently. See correct diagram above.
FIGURE 3 – STAND ALONE PAGE SYSTEM
4
-24
Microphone
V-400/450
SHIELDED
CABLE
V-2001A
ON
RED (+)
SHIELD
BLACK (-)
GREEN
WHITE
VALCOM
V-9939B
MICROPHONE ADAPTER
POWER
POWER
LO Z1
MIC SHIELD
LO Z2
HI Z
GND OUT
SWITCH
STATIONARY
BREAK
MAKE
RING
SW1
R2
R40
SW2
SW4
TIP
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
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-9939B to PAGE
TIP.
___ 4. Connect Ring of the V-9939B 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
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-9939B. This shield
should be strapped to power supply
GND.
___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-9939B 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-9939B.
___13. Connect Ground (+) of the V-2001A to
the power of the V-9939B.
___14. Volume adjustment:
___a. Turn the screwdriver adjustable
volume control on the V-9939B about
1/2 of the way clockwise.
___b. Speak through the microphone and
adjust the V-9939B screwdriver
adjustment for the proper page level.
5
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.
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 (540) 563-2000 and press 1 for
Technical Support or visit our website at
http://www.valcom.com.
The V-9939B 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
1. No relay operation in V-9939B
SYMPTOM
when microphone talk button is
pressed.
2. Relay operation but no output.
Check for -24VDC at V-9939B 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
SOLUTION
volume control up (clockwise).
3. Audio from V-9939B but not from
V-1094A.
Verify Tip and Ring connections from V-9939B to V-1094A. Verify proper
voltage and polarity at -24VDC and GND terminals of V-1094A. Turn up
volume at V-1094A.
4. No output from V-2001A.
Recheck all connections per Figure 4. Make sure the V-2001A passes the
power test in Figure 4, step 16.
5. Output from V-9939B and
V-1094A or V-2001A but not
from speakers.
Valcom, Inc. warrants its products 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. The obligation under this warranty 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
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
This 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, or use of the product.
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.
applied to units defaced or physically damaged);
and labor).
Headquarters: In Canada
Valcom, Inc. CMX Corporation
5614 Hollins Road 35 Van Kirk Drive #11 and 12
Roanoke, VA 24019-5056 Brampton, Ontario L7A 1A5
FAX: (540) 362-9800 FAX: (905) 456-2269
Phone: (540) 563-2000 Phone: (905) 456-1072
Verify proper voltage and polarity to speakers. Verify audio connections to
speakers. Verify speakers are Valcom one-way amplified speaker
assemblies.
VALCOM LIMITED WARRANTY
6
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