Yes you can if it's DTMF. But when you listen to the channel it would sound like a phone dialing a number at the beginning of every transmission, so most likely they are using MDC1200 which sounds like a squawk at the beginning, end or both of each transmission. If they are using MDC1200 you need to see if your TK-280 or 290 will support it, if memory serves right I don't think the TK-280 supports MDC1200 without an optional board I don't know about the 290.
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