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Aegis (and I assume Provoice) EDACS vs conventional bit polarity

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mitaux8030

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I noticed an interesting thing.

If on an Aegis EDACS talk group and digital voice is received fine,
and if I then happen to have programmed the EDACS site TX frequencies as a conventional system, to correctly hear the Aegis digital voice this way, I need to select under Digital Voice Options, RX & TX data polarity to Inverted.

Is this because when Aegis (and I guess this applies to ProVoice) is transmitted via the mobile or DVIU it undergoes a phase reversal through the GETC?
 
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