User manual

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19541P-42 (09-12)
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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
Cable Assembly Required
U3800 Vehicular Intercom System
C99
-
22MS (40935G
-
08)
U9800 Marine Intercom System
C99
-
20CX (40935G
-
07)
U9500 Marine Inte
rcom System
C99
-
20LL (40935G
-
06)
U3400 Portable Intercom System
U3100 Modular Intercom System
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.
Mounting
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. ceiling-
mount.)
See Appendix A for Mounting Templates.
Antenna
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.