TIL TST-4100 92-SC, Инструкция по установке и эксплуатации

Страница: 11 / 48

TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TST-4x00 92-SC Installation & Operating Instructions TiL 93RE126 Rev F
1-3
1.2.6 RF Isolator (Now standard on all units)
The RF Isolator is a broadband (118 MHz - 138 MHz) RF directional coupler. The RF Isolator
provides 20 dB of isolation between the antenna and RF Amplifier while providing 0.7 dB (Max.)
insertion loss.
1.3 MODES OF OPERATION
1.3.1 Local/Remote Operation
The Single Channel Transmitter can be operated in Local or Remote modes.
NOTE: Local operation is not disabled when operating in Remote mode and Remote operation is
not disabled when operating in Local mode. The two operating modes operate in parallel.
1. LOCAL OPERATION - In local operation, voice audio, and keying (PTT) functions are
routed from the microphone (not supplied) to the transmitter.
2. REMOTE OPERATION - In Remote operation, transmit audio and keying (PTT) functions
are routed over land lines to the 600 ohm remote inputs. Internal jumpers can be set for
±DC, ground, or tone transmitter keying, and to provide a RF Output Power signal
depending on the remote control board installed. Transmit audio is also routed to the
internal loudspeaker at an externally (high/low switch) adjustable preset level (see
conference audio).
1.3.1.1 Conference Audio
Conference Audio provides the operator with Tx voice on the transmitter speaker when the
transmitter is remotely keyed from another location. A 3-position high-off-low switch is provided to
externally control Tx audio levels. The Low position results in a 20dB lower audio level than when
the switch is in the High position.
The audio level of the transmit audio is internally adjustable from 0.0W to 0.5W of audio output.
The adjustment is performed via rotation of the potentiometer R7 (see Figure 2.6 for location),
which is accessible from the top of the transceiver after removing the top dust cover of the unit.
NOTE: The transmit audio level can be increased by rotating potentiometer R7clockwise and
decreased by counterclockwise rotation. If further adjustment of conference audio is required, the
top cover of the transmitter module must be removed to gain access to potentiometer R63,
located on the Audio Interface Module, A3 (see Figure 2.6 for location).