User manual

19541P-72 (09-12) 3 of 9

Intercom Interface

The U9921-GUV(EU) 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(EU) (see Figure 1). The following list contains David Clark intercom

systems that have been tested to work with the U9921-GUV(EU) and the required cable

assembly.

Table 1: Intercom Interface Cable Assemblies

David Clark Intercom

Cable Assembly Required

U3800 Vehicular Intercom System

C99

22MS (40935G

08)

U9800 Marine Intercom System

C99

20CX (40935G

07)

U9500 Marin

e Intercom System

C99

20LL (40935G

06)

U3400 Portable Intercom System

U3100 Modular Intercom System

C99-20MS (40935G-05)

The U9921-GUV(EU) will detect the cable assemblies listed above and automatically make the

necessary audio level adjustments for the corresponding intercom.

Mounting

The U9921-GUV(EU) 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. ceiling-

mount.)

See Appendix A for Mounting Templates.

Antenna

The U9921-GUV(EU) 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.