Ericsson GE PCS 136-174 MHz, Руководство по техническому обслуживанию

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2. Press the MONitor button to determine if the chan-
nel is in use. Never interrupt another conversation.
3. While holding the radio so that the antenna is verti-
cal, press the PTT switch and speak directly into
the grill or across the face of the radio or external
microphone. Speak in a normal voice. Release the
PTT switch as soon as the message is finished.
Messages (responses) cannot be received when the
PTT is being pressed.
4. When transmission is desired on a paging channel,
the PTT switch must be pressed twice. Press the
PTT switch the first time to take the radio out of
the paging mode. Press the PTT switch a second
time for normal PTT operation. Remember that a
PG flag flashes in the LCD window and the radio
beeps on the first press of the PTT switch.
The radio can be returned to the Type 99 paging
mode by pressing the MONitor button.
TO PLACE A DTMF CALL
Specific procedures for placing a telephone call from a
PCS DTMF radio are determined by the operating system
where the radio is used. Consult a system representative for
the exact operating procedures for the system.
The keypad on the PCS DTMF radio is not active until
the PTT switch is operated. Therefore, the PTT switch must
be pressed at all times when operating any button on the
DTMF keypad.
OPERATIONAL FEATURES
The radio is PC programmable to power-up in either Se-
lective (paging) or Monitor mode for channels programmed
for paging.
When Selective mode is chosen, the radio operates as a
tone and voice receiver, and allows only those calls that are
tone coded for the radio to be heard. Selecting Monitor
mode allows all calls with the correct Channel Guard (if
programmed) on the channel to be heard.
In either mode, when a correct T99 and Channel Guard
(if programmed and enabled) have been decoded, a series of
intermittent beeps will be heard to alert the operator of an
incoming call. A slow flashing PG flag will be illuminated
on the display to indicate that a call has been received.
When Selective mode is chosen, the radio switches auto-
matically to Monitor mode.
At the end of the message, if Selective mode is desired,
press and release the MONitor button to reset the Type 99
tone signalling function. The PG pixel on the display will
stop flashing at this time.
While in Selective mode, the radio can be put in Moni-
tor mode by pressing and releasing the PTT switch. A series
of beeps is sounded while the PTT is pressed, to indicate
that no transmission has occurred and the Monitor mode has
been selected as indicated by the flashing PG indicator.
However, any additional PTT activation will key the trans-
mitter.
The radio is programmable to decode any GE or Mo-
torola decode combinations from any one of two T99 tone
tables on a per-channel basis. TX and/or RX Channel
Guard can be programmed to any channel with T99.
Type 99 Receive Channel Guard (if programmed) can be
disabled, any time, by the procedure explained in the Moni-
tor/Channel Guard section. The volume level bars will
flash, indicating that Channel Guard has been disabled.
Automatic Number Identification
Automatic Number Identification (GESTAR) is a 320-
millisecond burst of code that is generated at the beginning
of each transmission to identify the PCS radio to the base.
If programmed, a beep is sounded at the end of ANI trans-
mission to indicate when conversation can begin as the mi-
crophone is disabled until the ANI transmission is
completed.
Systems with Channel Guard require the ANI be delayed
long enough for the system to respond before ANI can be
decoded. A programmable delay (0 to 2 seconds) is pro-
vided to meet this requirement. A delay of 350 millisec-
onds, for example, requires the operator to wait for 670
milliseconds after pressing the PTT switch before conversa-
tion can be started. The ID message can be programmed to
be sent at the end of a transmission, if desired.
Re-setting Type 99 from Monitor mode to Selective
mode does not affect the Channel Guard switch set-
ting.
NOTE
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