Looked and we do not have a manual for the SU42. This radio is not programmable and is not narrowband capable. It was produced with two channels: Ch1 454.500 (Brown Dot) and Ch2 464.550 (Yellow Dot). It also has 32 possible PL codes. You can see the current PL code by depressing the PL button for 1 second after turning on the radio.
Best regards.
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