Ericsson KPC-300, Руководство по обслуживанию

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CARRIER CONTROL TIMER
This feature, programmable on a per-channel basis, pre-
vents unnecessary channel traffic and radio damage if the
transmit timer limit is exceeded. If the programmed timer
times-out during a transmission, the radio will beep and stop
transmitting. The beeping tone will continue until the opera-
tor releases the PTT button. Releasing the PTT button resets
the timer.
TYPE 99 TONE DECODE
The radio is programmable to power-up in either selective
(Type 99) or monitor mode for channels programmed for
Type 99 decode.
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 pro-
grammed) 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. The PG status flag will blink in the display to
indicate that a call has been received. If the selective mode
was chosen, the radio switches automatically 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 status flag will cease blink-
ing.
While in selective mode, the radio can be put in monitor
mode by pressing and releasing the PTT. A series of beeps
is sounded whle the PTT is pressed to indicate that no
transmission has occured and the monitor mode has been
selected as indicated by with the blinking of the PG status
flag. A second press of the PTT will result in normal
transmission.
The radio is programmable to decode any Ericsson or
Motorola decode combinations from any one of two T99 tone
tables on a per-channel basis. Transmit and/or receive Chan-
nel Guard can be programmed to any channel with Type 99.
Type 99 receive Channel Guard (if programmed) can be
disabled by pressing the MONITOR button for more than
three (3) seconds.
If a Type 99 channel is in the scan list and scan is enabled,
Type 99 tones are ignored. Scanning is provided on a carrier
and Channel Guard basis only.
TELEPHONE INTERCONNECT (DTMF)
(KPC-400 ONLY)
The operator may make telephone interconnection calls
on radio systems equipped for this option. Specific proce-
dures for placing these calls are determined by the operating
system.
There are two methods to make telephone interconnect
calls. One method uses the top three keys (
1,2,3)
to send one of three pre-programmed numbers. The other
method is to use the keypad (
0-9) to manually enter
the telephone number.
The keypad is not active until the PTT button is pressed.
Therefore, the PTT button must be pressed at all times when
operating any button on the DTMF keypad. Communications
takes place in a simplex mode. You cannot talk and listen at
the same time. The PTT button must be pressed each time
you wish to talk and, released when you wish to listen.
SCAN
The scan feature permits monitoring of up to 16 receive
channels. The scanned channels can be any frequency within
the frequency band limits of the radio and can be Channel
Guard protected (tone or digital).
Any channel can be scanned with or without a priority
level. One channel can be programmed for Priority 1 (P1),
another for Priority 2 (P2) or any or all remaining channels
programmed as Non-Priority (S). The radio can be pre-pro-
grammed to permit an operator front panel selectable scan
list, a fixed Priority 1 channel or a selected Priority 1 channel
using the channel select switch.
Scan Vocabulary
The following terms are frequently used in scan operation
description.
•
Simple Scan - describes the condition when scan is
enabled and there is no activity on any channel in
the scan list.
•
Priority Scan - describes the condition when scan is
enabled and the priority scan channel is sampled
during the scanning of the channels on the scan list.
•
Channel Guard Scan - describes the condition when
scan is enabled and tone or digital Channel Guard
must also be detected before locking on any chan-
nel.
•
Selected Channel - indicates that this is the last
channel that the operator selected with the channel
select switch. This channel is displayed unless scan
is enabled and activity is detected on another chan-
nel being scanned.
Resetting Type 99 from monitor to selective mode does not
affect Channel Guard switch setting.
NOTE
AE/LZB 119 1874 R1A
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