Re: LF: RE: Combining LF amps revisited

[Chris Wilson <dead.fets@gmail.com>]

Hello Clemens,


Thanks  for  the  reply, the 3 stacked cores will rise to 70 degrees C
plus  even with a small computer processor fan blowing through them. I
am  investigating  ways  of  reducing  this, the cores are shown as 77
material  in  jay's  schematic,  but  he  and I are using the newer 78
material  for the PA output transformer cores. I may try using this 76
material  in  the  combiner transformer. Someone else suggested making
the   PA   output   transformers   work   at  100  ohms  and  using  a
transformer less  zero  degree  hybrid  coupler.  I'd  try  Andy's twin
primary,  one  secondary  transformer instead of the coupler if i knew
what winding ratio and what core to start off with. Thanks again.

> Hi Chris,

> I have a tool by DJ5IL here which predicts around 60°C for the cores
> (excluding heat caused by the winding)
> and ca. 480 Gauss flux density.

> 73
> Clemens
> DL4RAJ  



-- 
Best regards,
 Chris                            mailto:dead_fets@gmail.com