IDX CW-7 - Manual (Page 16)

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3.2. CW-7 Link initialization
When the power switch is turned on, TX and RX will start searching for a
frequency that it can be linked to. It will change the link mode if it is in
operation or the transmission signal is lost. The three LED lights will cycle
ON and OFF, starting from bottom to top until it is firmly linked. The LED
lights switching is an indication that it is searching for a counter device.
Searching (TX): Green LED blinks repeatedly.
Searching (RX): Green LED blinks repeatedly.