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Integrator’s Reference Manual
2-6 80-99208-1 Rev. D
Connecting Antenna Cables
The Modem Integrator’s Kit contains two antenna cables (3
feet long) with snap-in connectors, for connecting the modem
to the Dielectric Resonator Antenna (DRA). The antenna
must be located outdoors.
Due to loss constraints on antenna length (see Calculating
Antenna Cable Length on page 7-27), if you need to extend the
kit cables to reach your antenna, it is more practical to locate
the modem closer to the antenna and extend the modem’s
serial cables instead. For a tip on how to do this, see
Connecting and Mounting the Antenna on page 2-9.
OEMs must supply custom antenna cables for their modem
applications.
Caution
Either antenna cable in the developer’s kit can be used for transmit or
receive; however, you must make sure not to cross them. In other
words, be careful to connect the Tx connector on the antenna to the Tx
connector (J3) on the modem, and the Rx connector on the antenna to
the Rx connector (J7) on the modem. Crossing the Tx and Rx cables
can damage the modem.
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Steps
TO CONNECT THE ANTENNA CABLES TO THE MODEM
1. Select one antenna cable to be the transmit cable (it does
not matter which one).
2. Label both ends of that cable with “Tx.” For example, you
could write “Tx” on a piece of tape wrapped around each
end of the cable.
3. Plug either end of the cable marked “Tx” into the transmit
(Tx) connector (J3) on the modem, as shown in Figure 2-1.
4. Plug either end of the unmarked cable into the receive
(Rx) connector (J7) on the modem, as shown in Figure 2-1.