User manual

19541P-43 (03-12) 3 of 9
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Intercom Interface
The U9922-G38 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
Stand-alone configuration creates an ad-hoc wireless intercom and adds access to a two-
way radio. This configuration does not connect to a 3800 wired intercom system. A C99-
22PW (18748G-24) power cable and optional C3821 radio interface cable are required for
this configuration.
Antenna
The U9922-G38 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 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:
• Whip Antenna (P/N: 40688G-92)
• Remote Antenna Kit, Mag-Mount (P/N: 40688G-93)
• Remote Antenna Kit, Permanent (P/N: 40688G-96)