CONTROL CABLE SIGNALS 3

Terminal information

Consider the following points when using a non-Icom transceiver.

Terminal

Description

 

 

[KEY]

Key voltage. Grounded during tuning.

 

Max. current drain 100 mA.

 

 

[13.6]

13.6 V DC + input terminal.

 

Max. current drain 2 A

 

 

[STAR]

Receives start voltage.

 

Max. current drain 1 mA

[E]Ground terminal for above signals.

Start voltage [STAR]

When a start voltage (less than 1 V) is received, the AT-140 begins automatic tuning.

 

 

More than

 

 

350 msec.*

Start

8

 

 

 

 

 

 

 

 

 

 

 

 

voltage

 

 

 

 

 

Approx. 7.5 V

 

 

 

 

 

 

 

[V]

6

 

4

 

2

Less than 1 V to

start tuning

 

0

 

Time

*For tuner through operation; Less than 250 msec.

[KEY]

[STAR]

[13.6]

[E]

Key voltage [KEY]

During automatic tuning, the AT-140 grounds the key voltage line, and the HF transceiver reduces output power.

During automatic tuning

Key

Approx. 7.5 V

voltage 8

 

[V]

 

6

 

4

 

2

 

0

 

 

Grounded

Time

 

If the key voltage is more than 8 V, switch the mode

 

switch (S1) to OFF mode (lower position).

 

[E]

S1

 

 

 

[13.6]

NORMAL mode

 

[STAR]

OFF mode

 

[KEY]

 

 

 

Mode switch (S1)

 

 

6

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Image 9
Icom AT-140 instruction manual Control Cable Signals, Terminal information, Start voltage Star, Key voltage KEY