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EO 509 receiver - multiple versions


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I have the EO 509 III, and I know there was a version "II".   Does anyone know what the differences were between these versions?

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Yes there was version II:


And also version I. In the beginning there was E090.


I don't know the exact differences between I/II/III, i suspect they were just

modifications over the production, maybe also some frequency range differences.

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