05 Antenna Control Circuit; Signaling Paths; Rx Antenna Feature (Rx In / Rx Out Connectors); Antenna Output Feature (Ant Out Connector) - Kenwood TS-890S In-Depth Manual

05 ANTENNA CONTROL CIRCUIT

Signaling Paths

The TS-890S has two antenna connectors, ANT1 and ANT2, an RX IN and an RX OUT connector that can be used
for reception-only antenna input or connection of an external filter, as well as ANT OUT connector that can be used to
connect the receiver to an external device.
There are different paths that connect the antenna to the receiver. It is possible to switch the path from the antenna to
the receiver by altering the settings.

RX Antenna Feature (RX IN / RX OUT Connectors)

The RX Antenna is a feature that receives signals via the RX IN connector or sends the received signals from the RX
OUT connector when a reception-only 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.
When the [RX ANT] key is pressed to activate the RX antenna feature, signals from the antenna connectors (ANT1 and
ANT2) are blocked, allowing reception of signals input to the RX IN connector or output of signals from the RX OUT
connector.
To append an external bandpass filter, connect it between the RX OUT and RX IN connectors. However, reception is not
possible if signals are not correctly input to the RX IN connector.
Note:
◆ Install the RX antenna and TX antenna as far apart as possible. When transmitting from the TX antenna, a part of the transmit
power is induced on the RX antenna. Especially when using a linear amplifier, the RX antenna generates high voltage. Note
carefully that the high voltage may be applied to the RX IN connector of the TS-890S and may cause a failure.

Antenna Output Feature (ANT OUT Connector)

The TS-890S comes with an "Antenna Output Connector" for outputting signals from the antenna to an external device.
When the [RX ANT] key is pressed and held down to activate the antenna output feature, signals from the antenna
connectors (ANT1 and ANT2) can be split using a splitter circuit and the branched signals can be output to the ANT
OUT connector.
In principle, the splitter circuit has a 3 dB loss.
24
BPF, etc
Fig. 29 Signaling Paths
Splitter
3 dB loss