Can only go  by the  images  in the links  I sent a while back .. I was wondering,  after  Andy's  last post ,

Why not  simply  build a  copy  of the   Decca  out put  stage ,  series tuned cct's  and the  3 -2-1  adding  transformer
there  must be enough  of them  about,  for the  transformers  and chokes to be  identified , the  same  or  similar must be  about ..
tried and tested configuration ?

Taking  everything , via  the  , what appears to  be , a step  up , transformer , will  provide  isolation  from  the  Ae  , if you combine  at 50 ohms , then  everything  will  pass  back to the  amps , via the combiner ,

Could be  totally  wrong  of course, but there must of  been a  reason  for the  lay out ,  when  other  multi unit  pa's  used  50 ohm  combining networks
but its  tried and  tested and  what's better  than  2   500w power modules ? .. 3 of course ,)

73-G,





--------------------------------------------------
From: "Chris Wilson" <[email protected]>
Sent: Saturday, April 15, 2017 3:10 PM
To: "Graham" <[email protected]>
Subject: Re: LF: Poor aerial connection affecting gate waveforms??

Hello Graham,

Saturday, April 15, 2017, 2:14:17 PM, you wrote:

Chris,

I assume , due to the  Q any small  variation , will  move  the
tune  point  about , but  looking  in the   data base , Signals ,
better last night  to  sv8 than  the   previous night , and  may be
up  1 db at pa7  , not to say  the  noise was less , but  at  -10 db
that level   will  be  much  higher  than the  local noise level ,
should be a  reliable  indication

How important  are the  wave forms ?

73-G,

I don't know how important they are I am not a FET ;) All I know is
the output transformer and the LP filter bank central toroid run a lot
cooler if the wave forms aren't all spiky. I hope someone can say how
critical this is? Nothing went pop, so presumably not ultra critical,
but heat = lost power I would think? Cheers G!


--
Best regards,
Chris                            mailto:[email protected]

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