USER MANUAL Push Back Gateway U9920-GPB (P/N: 40993G-01) 19541P‐41 (02‐11) U9920-GPB(EU) (P/N: 40993G-02) ©2011 DAVID CLARK COMPANY INCORPORATED
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. DO NOT INSTALL ANY DAVID CLARK COMPANY PRODUCT THAT APPEARS DAMAGED. Upon unpacking your David Clark product, inspect the contents for shipping damage.
Overview The U9920‐GPB (40993G‐01) Push Back Gateway is a portable wireless communication device that when used in conjunction with one or more U9910‐BSW (40992G‐01) or U9912‐BSW 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: 1. Ensure power is on for both U9920‐GPB and belt station (see Power‐up/Power‐down) 2. Ensure units are within 1 to 3 ft (0.3 to 0.9m) of each other. 3.
Operation Power‐Up/Power‐Down To power up the U9920‐GPB 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, 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.
Receive Level Adjustment Procedure 1. Connect at least one belt station to the U9920‐GPB gateway and ensure sidetone is present (see belt station User Manual). 2. Press and hold PTT 3. While holding PTT, begin speaking and slowly turn Receive Level Adjust knob on the U9920‐GPB gateway clockwise until you hear an echo of your own voice. 4. Turn the Receive Level Adjust knob slightly counter‐clockwise until the echo stops. 5. Release PTT. 6.
Purging In some circumstances it may be necessary to “purge” the U9920‐GPB 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 Purge A full purge is the purge method employed by the U9920‐GPB and clears all links in the gateway.
Lift Door Insert Battery with Contacts Down Figure 3: Battery Insertion/Removal Troubleshooting Table 2: Troubleshooting Problem Gateway will not turn on Cannot link a belt station Cannot speak to aircraft Solution Review Power‐up/Power‐down procedure Ensure a fresh battery is installed Review Registration procedure Ensure units are within 1 to 3ft (0.3 to 0.
Care and Maintenance The U9920‐GPB 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: serviceWWW@DavidClark.com • By Mail: Customer Service David Clark Company 360 Franklin Street Worcester, MA 01604 If necessary, the U9920‐GPB may be wiped down with a mild soap and water mixture.
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.
