Yes, you can use the digirig lite without anything extra.? With a HT and I assume any other radio for which you have digirig cables.
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You don't need any other board.? No RA Board.? No DRA.??
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I made a leeetle veeedio just for you to show it working in FLDIGI and Winlink/VARA-FM:
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Hope that helps!
W4MRP