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It sounds like perhaps you have CTCSS turned on so it's blocking received signals that aren't using sub-audible tones. Make sure the "TSQ" indicator is not showing. Most Yaesu radios have the SQU or "T.SQ" option easily found in their menu structure..
The FT-1802 is a 50 watt 2 meter FM transceiver. It can transmit anywhere between 144 - 148 Mhz (the FM portion) of the 2 meter ham band. It can receive anywhere between 136 - 174 Mhz without any modifications. There is a modification to enable transmit "out of band" below:
There are few details about the results of this mod - typically these provide for transmitting on frequencies outside (above, below or both) of the 2 meter ham band. Transmitting outside of the ham band without a proper license for the frequencies in the U.S. is a violation of FCC rules.