On Feb 16, 2005, at 3:55 AM, G3rzp@aol.com wrote:
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.
Are you certain that the core material was not powdered iron?
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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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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