RSSI question

I have APM 2.5 on my quad with v3.0.1, I have a FrSky D8R-XP Rx in CPPM mode and have the RSSI connected to AMP 2.5 (with an RC of 1K and 10uF). I get a reading but it's not full scale because D8R-XP only outputs 3.3 volts max and APM 2.5 analog inpu

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