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Showing posts from March 6, 2017
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4 decodes of WD2XSH/17  all -29

 2017-03-06 01:26  WD2XSH/17  0.475648  -29  0  FN42pb  0.1  PA0O  JO33hg  5630  49  2017-03-05 23:04  PA0O  0.475602  -30  0  JO33hg  0.2  SV8RV  KM07ks  2042  142  2017-03-05 22:58  PA0O  0.475602  -25  0  JO33hg  0.2  SV8RV/1  KM07ks  2042  142  2017-03-05 22:10  PA0O  0.475601  -27  0  JO33hg  0.2  EA7HPM  IM67xj  2017  214



QTX  and IRF540Z  ( my last one  i smoked 9)  this version has about 2500 pF  G-S  It can run at 5A 22V   with the highest output sofar but at 100W input level everything heaths up coils and IRF the antenna current meter  relative  60-70%   must be close to  100W  rf 
the standard IRF540 measured 2700pF this one is second best   about  antenna  50% it is very critical in tuning  the IRF540 starts in self oscillating mode  then the output and current sudden drops to very low
I can get 100W level with the QTX but on the edge  and only with the Z version of the  IRF540   still have to fine tune with a piece of ferrit to have max ou…