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2.9
OPTIONAL EXTERNAL LOUDSPEAKER OR HEADPHONE
Provision is made for connection of either an external loudspeaker or headphone to the
SPEAKER/PHONE jack of the transceiver, as shown in Figure 3.1.
2.9.1
External Loudspeaker
When an external loudspeaker is to be installed, an 8-ohm nominal impedance loudspeaker
should be used. The loudspeaker cable should be terminated by a 1/4 in., 3 pole telephone plug
(male), with the loudspeaker connected between tip and sleeve (ground). The External
loudspeaker connector should be connected to the SPEAKER/PHONE jack located on the front
panel of the transceiver. When the external loudspeaker connector is connected to the
transceiver SPEAKER/PHONE jack, the internal loudspeaker is automatically disconnected.
2.9.2
Headset
When a headset is to be used, the headset impedance should be 150 to 600 ohms. The headset
cable must be terminated by a 1/4in., 3 pole telephone plug (male), which mates with the
SPEAKER/PHONE jack located on the front panel of the transceiver. When connected, the
internal loudspeaker is automatically disconnected. The headset may be connected as detailed in
(1) for receiver audio with no transmit sidetone audio, or (2) for receiver audio with transmit
sidetone audio.
(1)
HEADSET WITH NO TRANSMIT SIDETONE AUDIO - When receiver audio only with no
transmit sidetone audio is required, the headset should be connected between the tip and
sleeve (ground) of the telephone plug.
(2)
HEADSET WITH SIDETONE AUDIO - When receiver audio with transmit sidetone is
required, the headset should be connected between the tip and sleeve (ground) with a
resistor (located inside the plug) connected between the tip and ring of the telephone
plug. The function of the resistor is to reduce the transmit sidetone audio level to a
suitable listening level. The value of the resistor is determined by the headset impedance
and desired listening level. When a 600 ohm impedance headset is used, the value of the
resistor should be approximately 10 kilohms. For headsets with lower impedance, the
resistor value may be different but must not be less than 240 ohms.
2.10
OPERATIONAL CHECK
Perform an operational check of the transceiver, checking each channel in use in both the
transmit and receive modes of operation, using the Operating instructions given in Section 3 of
this document and the appropriate specified operating procedures during transmission.
TMS-150 91-DE Installation & Operating Instructions
TECHNISONIC INDUSTRIES LIMITED
www.til.ca
2-3
TiL 94RE146 Rev E
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