ARC's RT-485B is a solid-state TSO'd NAV/COMM transceiver. The RT-485B uses an electronic digital frequency display. For greater convenience, there are three memory frequencies on both the COMM and NAV sides. This radio is directly compatible with the RT-385A, offering an easy upgrade path.

However, please note that these radios are getting older, and reliability is falling over time.  If you are looking for a more-reliable alternative, we recommend you consider the TKM MX-385, which is directly interchangeable.

The ARC (Cessna) RT-485B features:

• 720 COMM channels
• 200 NAV channels
• 7 watts nominal transmission power
• Remote Glideslope channeling (such as the R-443B)
• Remote DME channeling

These are the most common indicators used in RT-485B installations:

For VOR/LOC installations:

• IN-385A VOR/LOC Indicator
• IN-385AC VOR/LOC Indicator (with autocentering)
• IN-485AC VOR/LOC Indicator (with autocentering)

For VOR/LOC/Glideslope installations:

• IN-386A VOR/LOC/Glideslope Indicator & R-443B Glideslope Receiver
• IN-386AC VOR/LOC/Glideslope Indicator (with autocentering) & R-443B Glideslope Receiver
• IN-486AC VOR/LOC/Glideslope Indicator (with autocentering) & R-443B Glideslope Receiver

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