Using Different Antenna Connectors For The Main Band And The Sub Band; Rx Antenna Function (Rx In And Rx Out Connectors On/Off); Connecting An External Receiver - Kenwood TS-990S In-Depth Manual

Using Different Antenna Connectors for the Main Band and the Sub Band

ANT 1 ANT 2
AT
FINAL
Fig. 2
The figure "Signaling Paths with ANT1 for the Main Band and ANT2 for the Sub Band" shows the case when different
antennas are selected for the main band and the sub band. The received signals are entered to the receiving circuits
from the antennas, not through the splitter, and are not subject to sensitivity deterioration by the insertion loss.

RX Antenna Function (RX IN and RX OUT Connectors On/Off)

When a reception‑dedicated antenna such as a low‑band Beverage antenna or loop antenna is used, when a bandpass
filter is appended externally, or when a Transverter is connected, the RX Antenna function enables to receive the signals
via the RX IN connector or send the received signals from the RX OUT connector.
Pressing the [RX ANT] key and then activating the RX antenna function blocks the signals from the antenna connectors
(ANT1 to ANT4) and allows reception of signals diverted to the RX IN connector or entered from the RX OUT connector.
To append a bandpass filter, it needs to be connected between the RX OUT and RX IN connectors. However, you
cannot receive the signals without correctly entering the signals from the RX IN connector.

Connecting an External Receiver

To receive signals via another receiver by using the RX antenna function, connect a splitter between the RX OUT and
RX IN connectors as shown in the figure "Example of Operating the RX Antenna Function (Main Band)" and make the
other receiver receive the signals split by the splitter.
The splitter to be used can split the entered signals with a 50 Ω impedance equally through two output terminals.
Connect one output terminal to the RX IN connector with the TS‑990S and the other to the other receiver. You can
connect a commercially available splitter or a user‑manufactured splitter as described below.
ANT 3 ANT 4
Signaling Paths with ANT1 for the Main Band and ANT2 for the Sub Band
ANTENNA SWITCHING CIRCUIT 02
BPF, etc.
RX (IN)
RX (OUT)
Each relay is in
the Off state (inactive).
Splitter
3 dB loss
MAIN
SUB
3