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What is the difference between an Aurora AU-510 and an AU-520 model radio?

What is the difference between an Aurora AU-510 and an AU-520 model radio?
Aurora

The AU-510 is built on a FLEX-8400 with ATU design, so it has one internal Spectral Capture Unit (SCU), whereas the AU-520 is built on the FLEX-8600 design, so it contains two SCUs and competition-grade preselectors. 

As a result, the AU-510 has four (4) antenna connectors (two that can output 500W), has two internal receivers, and can place those receivers on one antenna at a time. 

The AU-520 has six antenna connectors (two that can output 500W), has four internal receivers, and can place those receivers on either of two antennas at the same time.

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