David Clark 3800 U9922-G38 User manual

David Clark 3800 U9922-G38 User manual
3800 Gateway
(P/N: 40995G-02)
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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 U9922-G38(EU) (40995G-02) 3800 Gateway is a fixed-mounted wireless communication
device that when used in conjunction with one or more U9910-BSW(EU) (40992G-03) or
U9912-BSW(EU) (40992G-04) Wireless Belt Stations becomes part of a wireless intercom
system. The U9922-G38(EU) provides communication for up to four users as well as an interface
to an existing David Clark Model 3800 wired intercom system. Additionally, the U9922-G38(EU)
can be used as a stand-alone wireless intercom gateway with two-way radio interface. Up to
four belt stations can be connected to one gateway.
Status LED
Figure 1: Overview of Gateway
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Intercom Interface
The U9922-G38(EU) can be configured in one of two ways: 3800 interface and stand-alone.
3800 Interface
This configuration adds wireless capability to an existing 3800 wired intercom system and
can replace a U3811 or U3815 radio interface module (see 3800 system documentation
for further details.) In this way, all wired and wireless users may communicate with each
other as well as talk over and listen to a two-way radio. A C38-xx system cable and
optional C3821 radio interface cable are required for this configuration.
Stand-alone configuration creates an ad-hoc wireless intercom and adds access to a twoway radio. This configuration does not connect to a 3800 wired intercom system. A C9922PW (18748G-24) power cable and optional C3821 radio interface cable are required for
this configuration.
The U9922-G38(EU) has two external antenna connections and is supplied with one whip style
antenna. In most applications a single whip antenna is sufficient. However the optional remote
antenna kit (P/N: 40688G-93 for mag-mount, 40688G-96 for permanent install) is available
should more range be desired. In this case, we recommend keeping one whip antenna
connected directly to the U9922-G38(EU) and routing the remote antenna somewhere else (such
as on the roof of a vehicle).
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.
Acceptable antennas for use with this product:
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Whip Antenna (P/N: 40688G-92)
Remote Antenna Kit, Mag-Mount (P/N: 40688G-93)
Remote Antenna Kit, Permanent (P/N: 40688G-96)
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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 about 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 U9922-G38(EU)
and the belt station to link with.
3. Amber LED’s will flash quickly on both devices. A momentary red LED indicates a
successful close-link.
4. Upon successful link the U9922-G38(EU) will attempt to establish a connection with the
belt station.
5. Upon successfully establishing connection the LED on the gateway 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 LINK button has a multi-color LED in the center which serves as a status indication for the
gateway. Table 1 below lists these states.
Table 1: LED Status Indications
LED Color
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Blink Rate
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Initializing/power up
Connection Dropped
Connection Established
Low battery (approx. 1 hr remaining)
Linking/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 U9922G38(EU) while in range (and per the VOX settings on each VOX belt station.) Additionally, all belt
station users will have communication over the intercom. If a two-way radio is installed to the
U9922-G38(EU), 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 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 U9922-G38(EU) has the ability to adjust its receive level
from the intercom using the Volume knob (see Figure 1). Turning this knob will increase or
decrease the audio level coming from the wired intercom into the gateway. Perform this
adjustment to obtain optimum performance.
Intercom Level Adjustment Procedure
1. Connect at least one belt station to the U9922-G38(EU) gateway and ensure sidetone
is present (see belt station User Manual).
2. Begin speaking and slowly turn the Volume knob on the U9922-G38(EU) clockwise
until you hear an echo of your own voice.
3. Continue speaking and turn the Volume knob counter-clockwise until the echo stops.
4. You may wish to verify communication with someone hard-wired to the intercom.
Radio Level Adjustment
Audio levels to and from a two-way radio can also vary between radio models and
manufacturers. To adjust the U9922-G38(EU) for a particular radio, follow the procedures below.
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Radio Transmit Level Adjustment Procedure
Note: A radio service monitor is recommended for this adjustment.
1. Connect at least one belt station to the U9922-G38(EU) gateway and ensure sidetone
is present (see belt station User Manual).
2. Open the cover of the U9922-G38(EU) and find the large silver knob.
3. Press and hold the PTT and speak clearly and loudly into the microphone.
4. Slowly turn the knob until the radio service monitor reads 4.0-4.5kHz deviation.
a. Clockwise to increase level; counter-clockwise to decrease
Radio Receive Level Adjustment Procedure
1. Connect at least one belt station to the U9922-G38(EU) gateway and ensure sidetone is present (see belt station User Manual).
2. Open the cover of the U9922-G38(EU) and find the large silver knob.
3. Tune the radio to a continuous transmission (such as NWS) or transmit a test signal
from another radio.
4. Adjust the volume control on the radio to a level slightly higher than typical.
5. Slowly turn the knob until you hear a loud and clear signal on the wireless intercom.
a. Clockwise to increase level; counter-clockwise to decrease
The range of a belt station and a gateway can be up to 300ft (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 necessary to “purge” the U9922-G38(EU) 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.
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Smart Purge
A smart purge is the purge method employed for the U9922-G38(EU), 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 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.
Table 2: Troubleshooting
Gateway will not turn on
Cannot link a belt station
Cannot speak over two-way
Review Installation procedure
Ensure wiring is correct.
Review Linking procedure
Ensure units are within 1 to 3ft (0.3 to 0.9m) of
each other
Try a Smart Purge
PTT not pressed
No radio connected to U9922-G38(EU)
Replacement Parts
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System cable (C38-xx; number after dash indicates length in feet)
Power Cable (C99-22PW, P/N:18748G-24)
Radio Interface Cable (C3821, P/N: 18747G-06)
Whip Antenna (P/N: 40688G-92)
Remote Antenna Kit, Mag-Mount (P/N: 40688G-93)
Remote Antenna Kit, Permanent (P/N: 40688G-96)
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Care and Maintenance
The U9922-G(EU) is not user serviceable. Do not attempt to open the enclosure (unless adjusting
the radio level per the procedures noted in this manual.) If this product requires service, please
contact the David Clark Customer Service department:
[email protected]
By Mail: Customer Service
David Clark Company
360 Franklin Street
Worcester, MA 01604
If necessary, the U9922-G38(EU) 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
Average RF Power Output
1880 MHz - 1900 MHz (EU)
10 mW (250 mW peak) (EU)
300 ft (100m) line-of-sight (nominal)
Operating Temperature
-14°F to 113°F (-10°C to +45°C)
Storage Temperature
-4°F to 140°F (-20°C to +60°C)
Power Requirements
8 to 32 VDC
Unauthorized Changes
Changes or modifications not expressly approved by David Clark Company, Inc. could void the
users’ authority to operate the equipment.
Usage Restrictions
Due to the DECT frequencies used, this product is licensed for operation only in the European
Union countries.
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