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 2006
 
 

 

 

 

 

 

 

                   
 
 
  Modifications to the UK PSU unit        
 
 
             
                   
                   
                   
      Where Icom screwed up big time      
                   
      Text Box: I found my supply for the R-20 would bring in a huge amount of noise when the adaptor was plugged in to the radio on HF or any AM mode. It was even nasty enough to affect my Racal manpack the other side of the room! I've tamed it a little bit with a few component changes but this was a bad choice for this Text Box: UK PSU - This is a switching mode power supply in the UK. Other countries get issued with a more traditional analogue supply. The problems with switching mode supplies are well known especially with HF radios. Unless they are really well designed, they can send out sprogs up and down the spectrum.      
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
           
                   
                   
     

     
                   
                   
      There's the expected π (pi) circuit on the output here so I uprated the final cap from 100µF to 220µF and it considerably improved things.      
                   
                   
                   
                   
                   
                   

 

 

 

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