The British Army D11 and D13 transmitters (which was also a Naval
transmitter called the NT201, but in another colour scheme) used ferrite
loading of the
tank coil. That coil wound silver plated phosphor bronze tape from an
insulating former with the ferrite loading up one end, on to a brass drum. So
the
ferrite was only used at the lowest frequencies and there was a lot of it,
relatively loosely coupled to the coil itself. Worked very well at up 1kW out
in
commercial service, although the cooling of the bases of the 4-250As left a
lot to be desired, and there were problems with the sockets - just like those
reported on 3-500zs! Not perhaps surprising, since the filament assembly is
the same.
73
Peter G3RZP
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