David Clark | U9921-GUV | User manual | David Clark U9921-GUV User manual

David Clark U9921-GUV User manual
Universal Gateway
(P/N: 40994G-01)
19541P-42 (09-12)
Cautions and Warnings
READ AND SAVE THESE INSTRUCTIONS. Follow the instructions in this installation
manual. These instructions must be followed to avoid damage to this product and
associated equipment. Product operation and reliability depends on proper usage.
APPEARS DAMAGED. Upon unpacking your David Clark product,
inspect the contents for shipping damage. If damage is apparent,
immediately file a claim with the carrier and notify your David Clark
product supplier.
ELECTRICAL HAZARD - Disconnect electrical power when making any
internal adjustments or repairs. All repairs should be performed by a
representative or authorized agent of the David Clark Company.
STATIC HAZARD - Static electricity can damage components.
Therefore, be sure to ground yourself before opening or installing
LI-POLYMER - This product is used with Li-Polymer batteries. Do not
incinerate, disassemble, short circuit, or expose the battery to high
temperatures. Battery must be disposed of properly in accordance
with local regulations.
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The U9921-GUV (40994G-01) Universal Gateway is a fixed-mounted wireless communication
device that, when used in conjunction with one or more U9910-BSW (40992G-01), U9912-BSW
(40992G-02), or U9913-BSW (40992G-07) Wireless Belt Stations, becomes part of a wireless
intercom system. The U9921-GUV provides communication for up to four users as well as an
interface to an existing wired intercom system. Up to four belt stations can be connected to one
Figure 1: Overview of Gateway
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Intercom Interface
The U9921-GUV is designed to add wireless capability to an existing wired intercom. Connection
to the intercom is accomplished by connecting an interface cable to the interface connector of
the U9921-GUV (see Figure 1). The following list contains David Clark intercom systems that
have been tested to work with the U9921-GUV and the required cable assembly.
Table 1: Intercom Interface Cable Assemblies
David Clark Intercom
U3800 Vehicular Intercom System
U9800 Marine Intercom System
U9500 Marine Intercom System
U3400 Portable Intercom System
U3100 Modular Intercom System
Cable Assembly Required
C99-22MS (40935G-08)
C99-20CX (40935G-07)
C99-20LL (40935G-06)
C99-20MS (40935G-05)
The U9921-GUV will detect the cable assemblies listed above and automatically make the
necessary audio level adjustments for the corresponding intercom.
The U9921-GUV may be flush mounted or surface mounted using the included gasket and nut.
See Figure 1 for mounting suggestions.
Note: Bracket (P/N: 41045G-01) optional. Not used for flush mount applications. Bracket
mounting configuration may be reversed for varying requirements (e.g., vehicle dash vs. ceilingmount.)
See Appendix A for Mounting Templates.
The U9921-GUV has an internal antenna. An external antenna may not be necessary but the
antenna connector is provided for either the included whip antenna or an optional remote
antenna kit (P/N: 40688G-93 for mag-mount, 40688G-96 for permanent install).
Choose an open, clear location for the remote antenna and route the coaxial cable away from
any busy areas, preferably behind panels or in conduits.
This device has been designed to operate with the antennas listed below, and having a
maximum gain of 3 dB. Antennas not included in this list or having a gain greater than 3 dB are
strictly prohibited for use with this device. The required antenna impedance is 50 ohms.
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Acceptable antennas for use with this product:
Whip Antenna (P/N: 40688G-92)
Remote Antenna Kit, Mag-Mount (P/N: 40688G-93)
Remote Antenna Kit, Permanent (P/N: 40688G-96)
Before a belt station and a gateway can be connected, they must first be linked. As a security
measure, the close-link feature requires devices to be in proximity of between 1 to 3 ft (0.3 to
0.9m) in order to successfully link. This ensures that the units are not inadvertently linked with
other units on the premises.
Linking procedure:
1. Ensure units are within 1 to 3 ft (0.3 to 0.9m) of each other.
2. Simultaneously (within 1-2 sec) press and release the LINK button on the U9921-GUV and
the LINK/PTT button on the belt station to link with.
3. Amber LED’s will flash on both devices. A momentary red LED indicates a successful
4. Upon successful link the U9921-GUV will attempt to establish a connection with the belt
5. Upon successfully establishing connection the LED on the controller will flash a green
pattern corresponding to the number of belt stations connected.
Once linked, the devices will not need to be linked again unless they are purged (see
Each belt station is able to be linked to only one gateway at a time. A gateway can have up to six
belt stations linked and be connected to four of those six at one time.
Status Indications
The front panel has a multi-color LED in the center which serves as a status indication for the
gateway. Table 1 below lists these states.
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Table 2: LED Status Indications
LED Color
Blink Rate
Initializing/power up
Connection Dropped
Connection Established
Low battery (approx. 1 hr remaining)
Link/Connection in Progress
PTT asserted
Connected (pattern indicates
number of belt stations connected)
All connected belt stations will be able to communicate with each other through the U9921-GUV
while in range (and per the VOX settings on a VOX belt station.) Additionally, all belt station
users will have communication over the intercom. If the intercom is so equipped, pressing the
PTT button on a VOX belt station will allow the user to transmit over the system’s two-way radio.
Pressing the PTT overrides the VOX setting on a VOX belt station. Multiple VOX belt station users
may PTT and thus speak over the two-way radio simultaneously. For more information consult
the user manual for the belt station.
Wireless users who are not pressing PTT while another wireless user is pressing PTT
will not be heard on the wired intercom while the PTT remains pressed.
Intercom Level Adjustment
Audio levels can vary between intercoms, mainly due to the system level setting on the wired
intercom. To compensate for this, the U9921-GUV has the ability to adjust its receive level from
the intercom using the Vol keys (see Figure 1). Pressing these keys will increase or decrease the
audio level coming from the wired intercom into the gateway. Perform this adjustment to obtain
optimum performance.
Receive Level Adjustment Procedure
1. Connect at least one belt station to the U9921-GUV gateway and ensure sidetone is
present (see belt station User Manual).
2. Begin speaking and slowly and repeatedly press the Volume Up key on the U9921GUV gateway until you hear an echo of your own voice.
3. Continue speaking and press the Volume Down key until the echo stops.
4. You may wish to verify communication with someone hard-wired to the intercom.
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The range of a belt station and a gateway can be up to 300 ft (100m). If you are in an
environment with metal or concrete walls, this range could be reduced. If the belt station enters
into a "fringe" reception area, a brief sequence of three beeps will be heard in the headset. This
is to serve as a warning of a possible disconnection if conditions are not improved. When
possible, the user should attempt to regain line-of sight contact with the controller. When the
belt station travels out of range of the gateway, a voice alert will indicate that the connection has
been lost. To reconnect, simply move back into range and connection with the gateway will
automatically be reestablished, also noted by a voice alert.
In some circumstances it may be desired to “purge” the U9921-GUV of some of its linked belt
stations. Typically purging is not necessary unless there are multiple gateways in the same
vicinity and you wish to remove a belt station from this gateway and link to a different gateway.
A gateway can link up to six belt stations where a belt station can be linked to only one gateway
at a time.
Smart Purge
A smart purge is the purge method employed for the U9921-GUV, in which only unwanted links
are removed from the gateway. When this procedure is complete, only belt stations that are
connected to the gateway remain linked. All other belt station links will have been removed (see
the belt station User Manual for the individual belt station purging procedure when remaining
link purging may be necessary.)
Smart Purge procedure
1. Ensure the gateway is powered on and functioning.
2. Disconnect all belt stations to be purged (power off the belt stations).
3. Verify the number of green LED flashes on the gateway matches the number of
belt stations to be kept linked.
4. Press and hold LINK button on the gateway for 30 seconds until LED quickly
flashes red.
5. Release LINK button.
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Table 3: Troubleshooting
Gateway will not turn on
Cannot link a belt station
Cannot speak over two-way radio
Ensure correct interface cable is being used
(Table 2)
Review Registration procedure
Ensure units are within 1 to 3ft (0.3 to 0.9m)
of each other while linking
Try a Smart Purge
PTT not pressed
Two-way radio not installed to system
Replacement Parts
Interface cable assemblies:
David Clark Intercom
U3800 Vehicular Intercom System
U9800 Marine Intercom System
U9500 Marine Intercom System
U3400 Portable Intercom System
U3100 Modular Intercom System
Cable Assembly Required
C99-22MS (40935G-08)
C99-20CX (40935G-07)
C99-20LL (40935G-06)
C99-20MS (40935G-05)
Whip Antenna (P/N: 40688G-92)
Remote Antenna Kit, Mag-Mount (P/N: 40688G-93)
Remote Antenna Kit, Permanent (P/N: 40688G-96)
Mounting Bracket Kit (P/N: 41045G-01)
Care and Maintenance
The U9921-GUV is not user serviceable. Do not attempt to open the enclosure. If this product
requires service, please contact the David Clark Customer Service department:
By Mail:
Customer Service
David Clark Company
360 Franklin Street
Worcester, MA 01604
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If necessary, the U9921-GUV may be wiped down with a mild soap and water mixture. Although
it is a sealed device designed to withstand submersion in water to 1 meter, do not unnecessarily
submerse this product in water.
Avoid storage of this product in direct sunlight or high temperature environments.
Frequency Range
1920 MHz - 1930 MHz (U.S. and Canada)
Average RF Power Output
4 mW (100mW peak) (U.S. and Canada)
300 ft (100m) line-of-sight (nominal)
Operating Temperature
-14°F to 131°F (-10°C to +55°C)
Storage Temperature
-4°F to 140°F (-20°C to +60°C)
Power Requirements
8 to 25VDC
FCC Part 15 Statement
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is
- Consult the dealer or an experienced radio/TV technician for help.
You may also find helpful the following booklet, prepared by the FCC: "How to Identify
and Resolve Radio-TV Interference Problems." This booklet is available from the U.S.
Government Printing Office, Washington D.C. 20402.
In order to maintain compliance with FCC regulations shielded cables must be used with
this equipment. Operation with non-approved equipment or unshielded cables is likely to result
in interference to radio & television reception.
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Industry Canada Statement
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject
to the following two conditions: (1) this device may not cause interference, and (2) this device
must accept any interference, including interference that may cause undesired operation of the
Unauthorized Changes
Changes or modifications not expressly approved by David Clark Company, Inc. could void the
users’ authority to operate the equipment.
FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with a minimum distance of 20
centimeters (8 inches) between the radiator (antenna) and your body. This transmitter must not
be co-located or operating in conjunction with any other antenna or transmitter.
Usage Restrictions
Due to the UPCS frequencies used, this product is licensed for operation only in the United States
of America, Canada, and those countries that have approved the DECT 6.0 Standard.
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Appendix A: Mounting Templates
Figure A1: Flush Mount
Figure A2: Bracket Mount – Optional (P/N: 41045G-01)
19541P-42 (09-12)
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