BR200DV/BR300DV
Service Manual
27
Lock lost detection: When PLL is out of lock, IC pin4 will output low level signal to MCU
,
and then MCU
prohibit transmitter from transmitting with a warning tone.
Q8, the power filter, can provide PLL with more purified power to reduce the noise of frequency
synthesizer.
5.5 Base Band Processor
HR_C5000-1 (IC609) is a low power high performance base band processor supporting Tier 1 and
Tier 2 of the DMR protocol. it completes the entire physical layer and data link layer, and voice
processing part of the call control layer of DMR compliant with ETSI TS 102 361.
Figure 8 Base Band Processor
5.6 Voice Circuit
:
The station is equipped with Voice Prompt Function, which is very useful during night or under dark
condition.
The speaker will voice the current channel number when changing the channel every time because of
the voice memory chip (IC613), which stores channel voice prompts. It will repeat the current channel
number once pressing “Voice Prompts”.
The speaker will voice the current channel number under standby state if the Voice Prompt Function is
set. Press “Voice Prompts” for reset to switch voice types. Press “Voice Prompts” repeatedly for power
connection, then the voice types will be switched in circle in the order of “Chinese male voice—English
male voice—Chinese female voice—English female voice—no prompts”.
5.7 Power Supply:
The station use lithium battery (7.4V, 1700mAh), while transmitter amplifier circuit (Q105 Q107) and
receiver audio amplifier (IC302) use battery directly for power supply, and other circuits use regulated
voltage (5V and 3.3V).
Содержание BR200DV
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Страница 17: ...BR200DV BR300DV Service Manual 17 Exploded View of the Parts ...
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Страница 35: ...BR200DV BR300DV Service Manual 35 Chapter 6 PCB Layout ...
Страница 38: ...MIC1 C5 D4 D5 D8 C4 C3 R1 D2 D3 D6 C7 C8 C9 J1 D1 D9 C2 D7 C6 C13 C1 ...
Страница 72: ...BR200DV BR300DV Service Manual 68 Chapter 10 Block and Schematic ...