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參數(shù)資料
| 型號(hào)： | CM1481 |
| 英文描述： | Non-Predictive Selcall Module |
| 中文描述： | 非預(yù)測(cè)Selcall模塊 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 162K |
| 代理商： | CM1481 |
16
Functional Descriptions
Lead-In
Delay
PTT Out
(active "low")
Tone Out
Selcall Tones
Lead-In
Delay
Tone Out
Tone Out
Lead-In Tone with No Gap
Lead-In Delay
Lead-In Tone with Gap
--
the gap is 1 tone-length
Selcall
Tones
Selcall
Tones
Lead-In
Tone
Lead-In
Tone
The CM1481 has two audio operational modes -
Quiet/Open operations are initiated by:
(i) Pressing the Quiet/Open button (Dual Button operation) or a short press of the
Operate button (Single Button operation).
‘Quiet and Open’
.
Quiet operations are initiated by:
(i) A Timed Mute Reset operation.
(ii) A Remote Reset command received.
Quiet
The radio Rx audio is muted.
PTT (Tx) action is disabled.
Selcalling can either be disabled or enabled via initial configuration. There are no operational
alerts except for PTT and Call Action Disabled or Selcall Transmitted (if configured).
Open
Open modes can be configured to either
Unmuted
If called in an “Open” mode received Selcall tones will be output at the loudspeaker.
Configured as Open Mode:
Unmuted:
The radio is unmuted (MUTE CTRL inactive) and the loudspeaker (hash) is enabled. All
functions are enabled and operate as configured.
Transparent:
The radio audio circuits act as if squelched; Audio output is dependant upon the presence
of an RF carrier (BUSY input). MUTE CTRL is only inactive if the BUSY input is active.
or
Transparent
states.
Quiet/Open
Modes
Lead-In Tone
To operate on and gain access to, repeater systems the Selcall address output of the
module can be preceded by an extended tone. At configuration the tone operation, fre-
quency and length can be set; if required a single Selcall tone-period gap between the
lead-In tone and the Selcall address may be set.
Confgured as Lead-In Tone Length:, Lead-In Tone Dgt: and Lead-In Gap:
A configurable delay period between the operation of the PTT and the Selcall Tone output
from the module. This function is available to allow sufficient time for the transmitter to
stabilize before modulation.
Configured as Lead-In Delay:
Fig.9 Lead-In Tone and Delay
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