Repeater Operation
Switching the communication mode
This repeater is equipped with the AMS (automatic mode select) function which automatically selects one of four communication
modes to match the signal received or transmitted.
C4FM digital signals or analog signals are identified in order to automatically match the communication mode of the partner station.
When using AUTO mode, the AMS function is activated and the selected communication mode is indicated in red on the operation
mode screen.
When using FIX mode, touch [FIX] repeatedly on the operation mode screen to select the
communication mode. The selected mode is indicator in yellow and changes each time
[FIX] is touched.
Tip The combination of UP LINK for "FIX mode" and DOWN LINK for "AUTO mode" can not be set.
Communication mode Indicator Explanation of mode
V/D mode
(Simultaneous voice and data communication
mode)
NORMAL / DN The audio signal error is detected and repaired during the transmission of the digital
audio signal. This reduces interruptions to the conversation and is the basic C4FM
FDMA digital mode.
Voice FR mode
(Voice full-rate mode)
VOICE WIDE / VW Digital voice data is transmitted using the entire 12.5 kHz bandwidth. High quality
voice communication is possible.
Data FR mode
(High speed data communication mode)
DATA / DW High speed data communication mode using the entire 12.5 kHz bandwidth for data
communication.
Automatically switches to this mode for video communication.
Analog FM mode FM Analog communications using the FM mode.
This mode is effective for communication when the signal strength is so weak that
the voice is cut off or interrupted in the digital mode.
Caution
In the V/D mode (“NORMAL” is displayed), the position information is included in the transmitted signal during the conversation, however in the Voice FR
mode (“VOICE WIDE” is displayed), the position information is not included.
Adjusting the squelch level
Annoying noises can be muted when no signal is detected. The noise can be canceled more effectively when the squelch threshold is
increased, but it may become more difficult to receive weak signals. Adjust the squelch level as required.
Note When the squelch level is set to “open” the repeater will transmit, it must be connected to the duplexer and antenna. Use extreme caution when making
the squelch adjustment or measurement with a signal generator. Do not connect the signal generator to the duplexer antenna port, to avoid damaging the test
equipment. Connect the signal generator directly to the RX antenna connector on the DR-1.
1 Touch [SETUP]
The setup mode screen will appear.
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