The field radio xmits it. Been that way since the 70's. The dispatcher can click a button to encypt their transmissions if they want.
CBP use to have it so that all the field units where encypted by dispatch wasn't, but its was still end to end encrption between the field units. It can be implemented in many ways.
IT would defeat the purpose to transmit in the clear to have it repeated encrypted.
The repeaters do not do the encyption. The DIU3000 does...and all that happens with theQuantars is to resync the transmission so it all works.
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