[ARC5] SBD HF radio ?

[Hubert Miller]

Anyone know this?
SBD-5  had only 2 channel MHF radio
SBD-6 added 4 channel VHF radio

This fact from 2 pages i had saved years ago, from ? a now extinct militaria magazine ?
Very unfortunately, i did not title the pages with the source.

My question is, what was the 2 channel HF radio ?
-Hue Miller
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