WWW.DAVIDCAL.COMUSER MANUALPush Back GatewayU9920-GPB(EU)(P/N: 40993G-02)
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 depend on proper usage.
DO NOT INSTALL ANY DAVID CLARK COMPANY PRODUCT THAT 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 components.
LI-POLYMER – This product is used with Li-Polymer batteries. Do not incinerate, disassemble, short circuit, or expose the battery to high temperatures. The battery must be disposed of properly in accordance with local regulations.
Overview
The U9920-GPB(EU) (40993G-02) Push Back Gateway is a portable wireless communication device that when used in conjunction with one or more U9910-BSW(EU) (40992G-03), U9912BSW(EU) (40992G-04), or U9913-BSW(EU) (40992G-17) Wireless Belt Stations provides communication for up to four users as well as an interface to an aircraft intercom system. Only one gateway is required per system. Up to four-belt stations can be connected to one gateway.
Linking
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:
- Ensure power is on for both U9920-GPB(EU) and belt station (see Power-up/Powerdown)
- Ensure units are within 1 to 3 ft (0.3 to 0.9m) of each other.
- Simultaneously (within 1-2 sec) press and release the PTT button on the U9920-GPB(EU) and the belt station to link with.
- Amber LEDs will flash on both devices. A momentary red LED indicates a successful close-link.
- Upon successful link, the U9920-GPB(EU) will attempt to establish a connection with the belt station.
- Upon successfully establishing the connection the LED on the gateway will flash a green pattern corresponding to the number of belt stations connected.
Tip:Once linked, the devices will not need to be linked again unless they are purged (see Purging).Each belt station is able to be linked to only one gateway at a time. A gateway can have up to five belt stations linked and be connected to four of those five at one time.
Status Indications
Visual IndicationsThe power button has a multi-color LED in the center which serves as a visual status indication for the gateway. Table 1 below lists these states.
Table 1: LED Status Indications
| LED Color | Blink Rate | Status |
| Red | Solid | Initializing/power up |
| Red | Once | Connection Dropped |
| Red | Once | Connection Established |
| Red | Any | Low battery (approx. 1 hr remaining) |
| Orange | Slow | Idle/Disconnected |
| Orange | Fast | Link/Connection in Progress |
| Orange | Solid | PTT asserted |
| Green | Slow | Connected (pattern indicates the number of belt stations connected) |
Audible IndicationsThe Series 9900 System provides each active system user with a series of audible status indications, in the form of either voice prompts or beeps, which serve to direct the user’s attention to related system performance conditions. Table 2 below lists these conditions.
Table 2: Audible Status Indications
| Indication | Status |
| “Connection Established”(voice prompt) | Indicates an audible connection to a gateway and all mutually linked users |
| “Connection Lost”(voice prompt) | Indicates when an audible connection has been lost due to the user traveling out of range from its host gateway, or from inadequate line-of-sight conditions |
| “Connection Deleted”(voice prompt) | Indicates when a user’s belt station has been successfully purged from its host gateway. |
| 3 Beep Sequence | Indicates when a user has entered a ‘fringe’ reception area, where a connection could potentially be lost if conditions are not improved. |
| Continuous Tone(Approximately 5 secondduration) | VOX Adjustment Prompt; Indication of higher sensitivity settings during VOX adjustment (see VOX Adjustment Procedure Section) |
Operation
Power-Up/Power-DownTo power up the U9920-GPB(EU) Push Back Gateway, press and hold the POWER button for approximately two seconds. The LED will turn red and then begin flashing orange. If there are linked belt stations within range, they will automatically connect to the gateway in a few seconds after power-up.
To power down the U9920-GPB(EU), press and hold the POWER button for approximately two seconds. The LED will turn red and then turn off. The gateway is now powered down.
Aircraft Interface
- The U9920-GPB(EU) is designed for airport push-back operations and can be connected to an aircraft intercom system. Once connected, up to four-belt stations [U9910- BSW(EU)] or [U9912BSW(EU)] users can communicate to the pilot of the aircraft by pressing the PTT button on the belt station. A Push Back Cable is required between the U9920-GPB(EU) and the aircraft (see below: Figure 2 – connection illustration, and Table 2– PushBack Cable matrix.)
Table 2: Push Back Gateway Interface Cable Matrix
| Part Number | Configuration |
| 41035G-02 | ¼” Stereo Plug |
| 41035G-03 | U-174/U Plug (Civilian Only) |
| 41035G-04 | Dual G.A. Plugs (PJ-055/PJ-068) |
| 41035G-05 | U-174/U Plug (Military Only) |
| 41035G-06 | 7-Pin MS Connector (Military Only) |
| 41035G-08 | 6-Pin MS Connector (Military Only) |
| 41035G-09 | 7-Pin MS Connector (Military Only) |
The included lanyard and hook assembly, with Remove Before Flight banner (see Figure 1), facilitates the temporary mounting of the U9920-GPB to an aircraft. Care and judgment should be exercised when attaching to any part of the aircraft so that damage does not occur to the aircraft or the gateway.Important Note: Proper positioning of the U9920-GPB, to ensure a proper line of sight between system users and the gateway is essential to ensuring optimal wireless range and robustness of communications for all system users during operation.Establishing a proper line of sight typically involves, at a minimum, hanging the gateway low enough under the fuselage and any obstructions (i.e., landing gear doors and/or engines) so that the tow operator and wing walkers can see the unit when they are at their working positions prior to pushing the aircraft.The lanyard assembly is adjustable in length – from approximately 3 feet (1m) minimum to 6 feet (2m) maximum – to ensure that a proper line of sight is achieved when hanging the gateway from the aircraft. To adjust, slide the nylon strap in the appropriate direction through the adjustment buckle, and pull the hook to the opposite end of the lanyard away from the gateway. Attach the hook to the aircraft, check the length for appropriate gateway positioning, and readjust as necessary until optimum positioning is achieved.
WARNING:ALWAYS REMOVE THE GATEWAY AND ALL ASSOCIATED ITEMS FROM THE AIRCRAFT WHEN OPERATIONS ARE COMPLETE!
Aircraft Level AdjustmentAudio levels can vary between aircraft. To compensate for this, the U9920-GPB(EU) has a receive level adjust knob (see Figure 1). Turning this knob will increase or decrease the audio level coming from the aircraft and into the wireless intercom. By adjusting this knob, optimum performance can be achieved.Receive Level Adjustment Procedure
- Connect U9920-GPB(EU) to aircraft interphone via the mating Aircraft Interphone Cable (see Table 3, page 5).
- Connect at least one belt station to the U9920-GPB(EU) gateway and ensure sidetone is present (see belt station User Manual).
- Press and hold PTT.
- While holding PTT, begin speaking and slowly turn to Receive Level Adjust knob on the U9920-GPB(EU) gateway clockwise until you hear an echo of your own voice.
- Turn the Receive Level Adjust knob slightly counter-clockwise until the echo stops.
- Release PTT.
- You may wish to verify communication with the pilot or someone hard-wired to the aircraft’s intercom.
CommunicationAll connected belt stations will be able to communicate with each other through the U9920GPB(EU) while in range. Additionally, all belt station users will always hear any traffic on the aircraft intercom. To speak over the aircraft intercom, the belt station user must press and hold his/her PTT button (U9910-BSW(EU) and U9912-BSW(EU) only; U9913-BSW(EU) users cannot transmit over the aircraft intercom). Multiple belt station users may PTT and thus speak over the aircraft intercom simultaneously. Wireless intercom for all connected belt station users is also achieved in this manner. For more information consult the user manual for the belt station.
Note: A non-VOX belt station [U9912-BSW(EU)] is recommended for single user wireless pushback systems, as this will eliminate the potential for extremely high and varying noise levels within an airport environment to be unintentionally picked up by the microphone, causing the microphone to become “hot” and introduce background noise into the ser’s headset.RangeThe range of a belt station and a gateway can be up to 500 ft (150m). 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 an audible indication 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 prompt will indicate that the connection has been lost. To reconnect, simply move back into range, and connection with the gateway will automatically be re-established, also noted by a voice prompt.
Low BatteryUnder typical conditions, the battery in the gateway will last up to 24 hours or longer. The Status LED turns red to indicate that the battery is running low. Additionally, a voice prompt (“Gateway Low Battery”) is transmitted to all connected belt stations. This voice prompt is not heard by the pilot of the aircraft. At this point, approximately 1 hour of operation remains.
Auto Shut OffThe U9920-GPB(EU) will automatically shut off 30 minutes after the last belt station is disconnected.
Purging
In some circumstances, it may be desired to “purge” the U9920-GPB(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.Full PurgeA full purge is a purge method that clears all links in the gateway. After this procedure, no belt stations will automatically connect to this gateway until linked.
Full Purge procedure
- Power down gateway (see Power-up/Power-down).
- Press and hold the PTT button. Do not release.
- Power up the gateway (see Power-up/Power-down).
- Release the POWER button.
- Release the PTT button.
- Status LED will flash red to indicate a successful purge.
Smart PurgeA smart purge is a purge 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
- Ensure gateway is powered on and functioning.
- Disconnect all belt stations to be purged (power off the belt stations).
- Verify the number of green LED flashes on the gateway matches the number of belt stations to be kept linked.
- Press and hold the LINK button on the gateway for 30 seconds until the LED quickly flashes red.
- Release LINK button.
Battery Removal& Charging
All David Clark 9900-series wireless belt stations and battery-operated controllers/gateways use a 3.7V Li-Polymer rechargeable battery. This battery is removed by loosening the battery release screw (See Figure 1). The batteries are charged with the A99-04CRG 4-bay battery charger (41034G-01). When installing a battery, take care to align the battery properly and fully tighten the screw (see Figure 3).
Troubleshooting
Table 2: Troubleshooting
| Problem | Solution |
| Gateway will not turn on | Review Power-up/Power-down procedure Ensure a fresh battery is installed |
| Cannot link a belt station | Review Registration procedureEnsure units are within 1 to 3ft (0.3 to 0.9m) of each other while linking Try a Full Purge |
| Cannot speak to aircraft | PTT not pressed |
report this adReplacement Parts
- Battery (P/N: 40688G-90)
- Protective skin, orange (A99-02SKN, P/N: 40796G-03)
- Nylon Lanyard/Hook Assembly with Split Ring (P/N: 13376P-04)
- “Remove Before Flight” Banner (P/N: 19540P-31)
Care and Maintenace
The U9920-GPB(EU) is not user-serviceable. Do not attempt to open the enclosure. If this product requires service, please contact the David Clark Co. Inc. Customer Service department:
- Phone: 800.298.6235
- E-Mail: [email protected]
- By Mail: Customer ServiceDavid Clark Company360 Franklin StreetWorcester, MA 01604
If necessary, the U9920-GPB(EU) may be wiped down with a mild soap and water mixture. Although it is designed as a water-tight device, do not unnecessarily submerse this product in water. Avoid storage of this product in direct sunlight or high-temperature environments.
Specifications
| Frequency Range | 1880 MHz – 1900 MHz (EU) |
| Average RF Power Output | 10 mW (250 mW peak) (EU) |
| Range | 500 ft (150m) line-of-sight (nominal) |
| Battery Life | 24 hrs continuous use (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 | 3.7V @ 100mA nominal |
| Battery Type | 3.7V 2000mAh Li-Polymer |
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, and those countries that have approved the DECT EU Standard.
References
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