Figure 2. Main/Sub Receiver Routing Including RX ANT IN on KXV3B Module
KAT3A ATU and Antenna 2
The KAT3A internal ATU option, which can be installed in place of the KANT3 antenna input module,
provides a second SO-239 antenna jack (ANT 2). As shown in Figure 3, relay K3 routes either ANT 1 or ANT 2
to the main RF path. The antenna not routed to the main path (the non-transmit antenna) can optionally be used
as the sub receiver’s AUX RF antenna. This requires that the two antennas connected to the KAT3A be well
isolated from each other. If not, the sub receiver’s carrier-operated relay may turn on during transmit. If this
occurs, you must either move the two antennas farther apart, or not connect the sub receiver to the KAT3A.
It may be preferable to connect the sub receiver’s auxiliary RF input to the AUX RF connector on the rear panel.
A well-isolated receiving antenna can then be used with the sub receiver when required. (See CONFIG:KRX3
for sub receiver antenna setup.)
Figure 3. KAT3A ATU Antenna Routing
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