1-5
Transmission will occur on the channel frequency displayed on the Liquid Crystal
Display (LCD). Frequency is determined by keypad entry of the operating frequency or
by recalling a stored channel.
(2)
RECEIVE MODE - When the PTT switch on the microphone is released, the transceiver
operates in the receive mode. The Tx ON amber LED will go OFF, indicating that the
transmitter is inhibited. Reception of the frequency displayed on the LCD will occur.
The setting of the SQUELCH CONTROL determines the squelch threshold level. When
the SQUELCH CONTROL is rotated in the counter-clockwise direction, the SQUELCH
INDICATOR green LED will go ON, indicating that the squelch circuit is connecting the
demodulated audio to the VOLUME CONTROL. The setting of the VOLUME CONTROL
determines the audio level produced from the internal speaker. When the VOLUME
CONTROL is adjusted in the clockwise direction, the audio level will increase.
NOTE
When the connector of the external loudspeaker or
head phone is connected to the transceiver
SPEAKER/PHONE jack, the internal loudspeaker is
disconnected and the VOLUME CONTROL will control
the audio level of the external loudspeaker or
headphone.
1.3.2 Scan, Search, and Toggle Modes
1.
SCAN MODE - In Scan Mode, the transceiver cycles through the preset Channel
Frequencies and locks on to the first channel received in scan sequence. Audio is
enabled for 5 seconds for operator identification. Pressing the Press-to-Talk switch exits
the scan mode. If there is no operator action then the scan sequence continues in the
scan sequence continuously.
2.
SEARCH MODE - In Search mode the transceiver cycles through the preset Channel
Frequencies and locks on to the first channel received in the scan sequence and normal
operation is resumed.
3.
TOGGLE MODE - In toggle mode the transceiver alternates between the current channel
selection and the previous channel selected.
1.3.3 Local/Remote Operation
The Portable Transceiver can be operated in Local or Remote modes. An Independent record
output is provided for communication monitoring and recording. Early 91-DE transceiver units
employed a front panel switch to select local or remote operation. Later 91-DE units do not
employ the switch and local/remote operation will occur simultaneously.
1.
LOCAL OPERATION - In local operation, voice audio, and keying (PTT) functions are
routed from the microphone to the transceiver. Receive audio is routed to the internal
loudspeaker.
2.
REMOTE OPERATION - In Remote operation, transmit audio, keying (PTT), and receive
audio functions are routed over land lines to the 600 ohm remote input. Internal
jumpers can be set for ±DC or ground transmitter keying, and to provide a DC
phantom squelch signal.
Summary of Contents for TiL-91-DE/S
Page 6: ...1 2 Figure 1 1 TPS 250 Portable Transceiver General View Closed Open View...
Page 7: ...1 3 Figure 1 2 Transceiver Front Cover Assembly...
Page 14: ...2 2 Figure 2 1 Battery Installation and Removal...
Page 18: ...2 6 Figure 2 2 Fixed Channel Jumper Locations...
Page 20: ...2 8 Figure 2 3 Remote Operation Jumper Locations...
Page 25: ...3 2 Figure 3 2 Transceiver Front and Rear Panel Layout...
