24-05-2019, 11:41 AM
Did "Small Ships Radio Service" take off after my grandfather stopped manufacturing spark gap
transmitters just after WW1 ? E.G.Beard
Later years he did Audio amplifiers for picture theatres, AM radios with separate SW band modules,
not just switched coils. During WWII gear to detect V2 rockets. Company name "Udisco".
Remember the "Daylight Screens" for overhead projectors in the 1960s, his invention.
Your set:
Does it have a Modulation Transformer indicating AM ?
Big Germanium power transistors and silicon diodes for DC-DC converters were available in the early 1960s.
But valves still were king at any RF work.
A piece of history, 2182, 2201 2524 4125 and 6204 KHz as I recall.
Alan VK2ZIW
transmitters just after WW1 ? E.G.Beard
Later years he did Audio amplifiers for picture theatres, AM radios with separate SW band modules,
not just switched coils. During WWII gear to detect V2 rockets. Company name "Udisco".
Remember the "Daylight Screens" for overhead projectors in the 1960s, his invention.
Your set:
Does it have a Modulation Transformer indicating AM ?
Big Germanium power transistors and silicon diodes for DC-DC converters were available in the early 1960s.
But valves still were king at any RF work.
A piece of history, 2182, 2201 2524 4125 and 6204 KHz as I recall.
Alan VK2ZIW