This is the BAMA archive. These manuals are available for download and free of charge. Do not be tricked into paying for a manual that is available here for free.
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The HRO-50 manual is a composite of the incomplete manual that is available elsewhere on the web with the missing pages supplied by Bob Lawson, W4RL. In particular, the schematic has been redone and is now usable. Several other pages have been re-scanned and added to the folder. The original scans were brought to my attention by Christian Javier Pedernera, LW2DXX.