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Circuit Description
Low Current Base Tech 3.5
REMOTE CONTROL
A 25-pin D-sub connector for remote control is provided on the rear panel of Base Tech III. The functions of
each pin are shown below.
Pin
No.
Name Description
I/O
Levels
Comments
1
CH0
LSB external binary channel
selection
I
0-+3.3VDC
0000 is channel 1
2
CH1
External binary channel selection
I
0-+3.3VDC
3
CH2
External binary channel selection
I
0-+3.3VDC
4
CH3
MSB External binary channel
selection
I
0-+3.3VDC
1111 is channel 16
5 Unassigned
6
REM MON
Remote Monitor
I
0-+3.3VDC
+3.3V=Monitor On
7 GND
8 Unassigned
9
DIG/AN TX
Remote TX Mode
I
0-+3.3VDC
+0.0VDC = Rem Dig TX
10
DEM OUT
Discriminator audio out
O
≈
330mVrms 1KHz @
±
3KHz C4FM on DIG
11
BUSY
Channel busy indication
O
0-+3.3VDC
+3.3V=busy
12
RSSI
Receive signal strength indicator
O
0-+2.5VDC analog
13
MOD1
External audio modulation input
I
≈
50mVrms 1Khz for
±
3KHz
14 GND
15
PTT
Push to talk
I
0-+3.3VDC
0V=transmit
16
MOD2
External modulation input
LOW FREQ i.e. CTCSS/DCS IN
I
≈
400mVrms 1KHz for
±
3KHz After limiter and filtering
17
SIMP
Simplex mode selected
O
0-+3.3VDC
0V=simplex
18 ERR
Alarm
indication
O 0-+3.3VDC
Duty Cycle Determines which
alarm
19
DECODE
Decode valid indication
O
0-+3.3VDC
5V=valid signaling
20
RX AUD1
Buffered receive audio
O
≈
700mVrms 1KHz @
±
3KHz 1 & 2 Can produce 0 dBm
into
21
RX AUD2
Buffered receive audio
O
≈
700mVrms 1KHz @
±
3KHz 600 ohm input
22 TX
OUT
O
23
EXT PW/SW
External power switch
I
0-Open source
0V=ONf
24
REMOTE
External channel selection mode
I
0-+3.3VDC
0V=external
25 +12V
Pin 14
Pin 25
Pin 13
Pin 1
17
© 2012 Midland Radio Corporation
Содержание 91-1060-91-1110
Страница 22: ...Circuit Description Low Current Base Tech 3 5 Notes 2012 Midland Radio Corporation 18 ...
Страница 23: ...Block Diagram VHF 60 Watt Low Current Base Tech 3 5 19 2012 Midland Radio Corporation ...
Страница 24: ...Block Diagram VHF 110 Watt Low Current Base Tech 3 5 2012 Midland Radio Corporation 20 ...
Страница 25: ...Block Diagram UHF 50 Watt Low Current Base Tech 3 5 21 2012 Midland Radio Corporation ...
Страница 26: ...Block Diagram UHF 100 Watt Low Current Base Tech 3 5 2012 Midland Radio Corporation 22 ...
Страница 27: ...Front Panel Unit Schematic Low Current Base Tech 3 5 23 2012 Midland Radio Corporation ...
Страница 28: ...Analog Logic Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 24 ...
Страница 29: ...VHF RX Main Unit Schematic Low Current Base Tech 3 5 25 2012 Midland Radio Corporation ...
Страница 30: ...VHF RX VCO Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 26 ...
Страница 31: ...VHF TX Main Unit Schematic Low Current Base Tech 3 5 27 2012 Midland Radio Corporation ...
Страница 32: ...UHF RX Main Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 28 ...
Страница 33: ...UHF RX VCO Unit Schematic Low Current Base Tech 3 5 29 2012 Midland Radio Corporation ...
Страница 34: ...UHF TX Main Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 30 ...
Страница 35: ...Front Panel Unit Layouts Low Current Base Tech 3 5 31 2012 Midland Radio Corporation ...
Страница 36: ...Analog Logic Unit Layouts Low Current Base Tech 3 5 2012 Midland Radio Corporation 32 ...
Страница 42: ...THIS PAGE INTENTIONALLY LEFT BLANK 2012 Midland Radio Corporation 38 ...
Страница 43: ...Palm Microphone Schematic Low Current Base Tech 3 5 39 2012 Midland Radio Corporation ...
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