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Ameritron RCS-12 Instruction Manual

When the transceiver or antenna is selected for a particular band. The pin on the Auxiliary Output jack

will corresponding to the band will be 5V. When using UHF/VHF the output from the Auxiliary Output

port will be as follows:

NOTE: Some radios output the same band data for two bands such as the Icom (15m& 17m,

12m & 10m). Even though the radio has changed bands, it may not be reflected in the

band data output of the radio.

When the Auxiliary Output Port has been configured for Antenna Out. The output will correspond to the

currently selected antenna. Pin 9 is a TX line that goes to ground when the transmitter is keyed. The

diagram below shows the pin-out of the jack. The currently selected antenna's pin on the Auxiliary Out

will be +5V while the remaining pins will be 0V.

Auxiliary Output

*Ground is on the shell of the DB-9 plug

Radio Key In

The Radio Key In jack, when pulled to ground, will prevent the RCS-12 from switching antennas. The

Radio Key In jack is +5V open collector and will deliver 1mA when pulled to ground. This jack should

be connected to the transceiver's relay control line that goes to ground on transmit. This line is normally

used for keying an amplifier.

The Radio Key In jack and Pin 7 of the Radio Input Port are the same connection. Use only one of the

two connections.

Amp Key Out

The Amp Key Out jack will go to ground when the Radio Key In line is pulled to ground. This jack is

used for keying an amplifier's T/R relay control line. This line can accept up to 25VDC at 1A.

The Amp Key Out jack and Pin 9 of the Aux Output Port is the same connection.

Band

Pins

1 & 8

Sub 2m

1 & 7

1 & 6

70cm

1 & 5

33cm

1 & 4

23cm

1 & 3

Auxiliary Output (Antenna Out 1 of 8)

Pin 1 – Antenna 1

Pin 2 – Antenna 2

Pin 3 – Antenna 3

Pin 4 – Antenna 4

Pin 5 – Antenna 5

Pin 6 – Antenna 6

Pin 7 – Antenna 7

Pin 8 – Antenna 8

Pin 9 – TX Key

Automatic Antenna Switch