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YAESU MUSEN CO., LTD.
DR-1
REPEATER, BASE and REMOTE Mode Operations
Using the [CONTROL I/O] connector on the rear panel of the DR-1, operation modes and their
features can be set.
Operation modes
● REPEATER mode
The DR-1 is a complete full function repeater, including control of COR, TOT, ID, CTCSS, DCS,
C4FM, ASM, FM etc.
● BASE mode
By grounding Pin 1 of the [CONTROL I/O] connector at the back of the DR-1, the repeater may
be used in BASE mode and functions as a VHF/UHF base station with an optional MH-48A6JA
microphone. Pins 1, 2, 3, 4, 6 and 7 may be used for input and control while in BASE mode.
Tip
In case of jamming or interfering signal, Pin 1 may be grounded by external control to temporarily disable
repeating the receiver input.
● REMOTE mode
When [REMOTE] is set to ON in the SETUP menu, the repeater transmit and receive modes
are determined by the logic values on Pins 11 and 12 of the [CONTROL I/O] connector.
In REMOTE mode, Pins 13 and 14 reflect the valid RX and TX tones.
Discriminator and Audio outputs are provided on Pins 8 and 9.
Connection to an external controller
To interface the DR-1 with an external controller for remote control, additional cables are needed
to connect to the [CONTROL I/O] connector. Your controller may require rewiring.
Link operation may require four connections: receiver audio, transmitter audio, receiver COR,
and transmitter PTT; however these are not available on the DR-1’s [CONTROL I/O] connector.
NOTICE
When using the DR-1 with an external controller, the COR, analog and digital IDs, TOT,
DSC/CTCSS, TX power, etc. are already controlled by the DR-1 internal control. These
internal controls cannot be disabled. The external controller must not conflict with these
functions. Some functions of the internal controller cannot be overridden.
Before connecting an external controller you must make sure which functions are already
internally controlled. Special precautions must be considered when planning to link with
external systems.
Pin assignment of [CONTROL I/O] connector
*1: These functions may only be activated while the repeater is in Base mode.
*2: These functions may only be activated while the repeater is in Remote mode.
Pin No Pin Name I/O Function
1 BASE Input [L] GND: Base mode [H] OPEN: Repeater mode
2 PTT*
1
Input [L] GND: EXT PTT ON [H] OPEN: EXT PTT OFF
Tip On signaling while controlling the external PTT:
Pin 6 (TONE IN) ... Valid
Pin 7 (AF IN) ... Invalid
3 CTCSS/DCS
(PKSQL)*
1
Output [L] GND: Decoded [H] OPEN: Undecoded
4 SQL DET
(Noise SQL)*
1
Output [L] GND: SQL open [H] OPEN: SQL close
5 GND GND GND
6 TONE IN*
1
Input CTCSS/DCS EXT input / 600 ohm, 500mV peak to peak
Valid during external PTT control
7 AF IN*
1
Input EXT Modulation input / 600 ohm, 1.5V peak to peak
Valid during external PTT control
8 DISC OUT Output Up-link RX DISC output (w/o de-emphasis), 500mV peak to peak
discriminator output during up-link reception. Does not affect the
operation mode of the repeater.
9 AF OUT Output Up-link RX AF output (w/ de-emphasis), 300mV peak to peak
Analog audio output during up-link reception. Does not affect the
operation mode of the repeater.
10 GND GND GND
11 EXT port 1*
2
Input In Remote mode, the logic combination of Ports 1 and 2
determines the transmit and receive modes as below:
Port 2 Port 1 RX TX
H H AUTO
(AMS)
FM
H L FM FM
L H Digital Digital
L L AUTO
(AMS)
AUTO
(AMS)
12 EXT port 2*
2
Input
13 EXT port 3*
2
Input [L] GND: RX Tone OFF [H] OPEN: Setup mode
14 EXT port 4*
2
Input [L] GND: TX Tone OFF [H] OPEN: Setup mode
15 VCC VCC Switched VCC (13.8 V)
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