SMR3.BMP is the schematic diagram for a Marconi ship's main receiver
(SMR) 1950's vintage.  The original was too frail to be scanned so
was redrawn using Paintbrush.  I took the liberty of using more modern
schematic symbols so as to not confuse you (like it did me!).  

73 - Gord Skiffington VE1AJF