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DR-2X / DR-2XE Operating Manual 43
Pin No Pin Name I/O Descriptions
1 EXT I/O Input
[
L
]
GND: Remote mode
[
H
]
OPEN: Repeater mode
2 PTT Input
[
L
]
GND: EXT PTT ON
[
H
]
OPEN: EXT PTT OFF
When this pin is pulled low by an external device, it keys the repeater
transmitter.
On signaling while controlling the external PTT:
Pin 6 (TONE IN) ... Valid
Pin 7 (AF IN) ... Invalid
3
CTCSS/DCS
(PKSQL)
Output
[
L
]
GND: Decoded
[
H
]
OPEN: Undecoded
Signaling settings in the repeater setup menu will be applied.
4
SQL DET
(Noise SQL)
Output
[
L
]
GND: SQL open
[
H
]
OPEN: SQL close
This is an open-collector, active-low output capable of sinking about 10
mA. It indicates that the receiver squelch is open. If the squelch control is
properly set, this indicates a carrier on the receiver channel.
5 GND GND Chassis ground for all logic levels and power supply return
6
TONE IN Input
CTCSS/DCS EXT input / 600 ohm, 500 mV peak to peak
Valid during external PTT control
This pin is sub-audible tone input, and has a flat response characteristic
(repeater deviation is constant for a given signal level over the frequency
range of 5 ~ 250 Hz). Injecting a too high signal level here causes over-
deviation of CTCSS or DCS, degrading performance.
Use shielded cable to connect to this pin, connecting the shield to GND.
7 AF IN Input
EXT Modulation input / 600 ohm, 1.5 V peak to peak
Valid during external PTT control
This pin is audio input (300 ~ 3,000 Hz). This audio is injected before the
splatter filter stage, so excess signal input levels are clipped.
It is impossible to input analog modulation signals and convert them to
digital signals on DR-2X/DR-2XE.
Use shielded cable to connect to this pin, and connect the shield to GND.
To use the external AF input, set the Pin11/Pin12 EXT port setting to RX: Auto
(AMS) / TX: FM (FIX).
8 DISC OUT Output
Up-link RX DISC output (w/o de-emphasis), 500 mV peak to peak
Discriminator output during up-link reception. Does not affect the operation
mode of the repeater.
Received signals with standard deviation produce 500 mVp-p audio (300
- 3,000 Hz) are output at this pin. The signal is extracted before the de-
emphasis and squelch circuitry. Use shielded cable to connect to this pin,
and connect the shield to GND.
9 AF OUT Output
Up-link RX AF output (w/ de-emphasis), 300 mV peak to peak
Analog audio output during up-link reception. Does not affect the operation
mode of the repeater.
This pin is an output for AF signal (300 mVp-p), being extracted after the
de-emphasis.
Demodulated digital signals can be output as well.
10 GND GND Chassis ground for all logic levels and power supply return
11 EXT port 1
ø
Input
In Remote mode, the logic combination of Ports 1 and 2 determines the
transmit and receive modes as below:
Port 1 Port 2 RX TX
H H Auto (AMS) Digital
L H Digital Digital
H L Auto (AMS) FM (FIX)
L L Auto (AMS) Auto (AMS)
12 EXT port 2
ø
Input
13 EXT port 3
ø
Input
[
L
]
GND: RX Tone OFF
[
H
]
OPEN: Setup mode
Input a low level signal to indicate that the receiving tone is invalid.
14
EXT port 4
ø
Input
[
L
]
GND: TX Tone OFF
[
H
]
OPEN: Setup mode
Input a low level signal to indicate that the transmitting tone is invalid.
15 VCC VCC
Power supply
This pin provides 13.8V, 2.0A, DC from the repeater supply. There is an
internal 3 A fuse to prevent damage to the repeater.
ø
These functions may only be activated while the repeater is in Remote mode.
45


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