INDEX Page. 44 of 89
13.3 Connections TX-INH, / TX-INH
All modern transceivers have a delay before the transmission to allow the linear to
stabilize their relays avoiding damage to the contacts as a result of "Hot Switching".
The Expert 1.5K-FA has a settling time of less than 6 msec. compatible with all modern
transceivers (see the manual of the transceiver).
Some transceivers have an input (called TX-INHIBIT, LINEAR, MUTE, etc..) which
disables the transmission.
This input can be used with transceivers that do not have such delay or, more generally,
to improve the safety of switching.
The Expert 1.5K-FA has two outputs that can be connected to the TX-INHIBIT of the
transceiver:
a) TX-INH, usually gnd. (550 ohm), stops the transmission when at a + 12VDC.
b) / TX-INH, open collector normally OFF, stops the transmission when this line
goes to ground (ON).
To choose a) or b) as well as to enable the TX-INHIBIT input , refer to the manual of the
transceiver.
TX-INH Link
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