[Amps] Re: compact coils...

[R.Measures]

On Feb 16, 2005, at 3:55 AM, G3rzp at 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