Re: [RFI] Experience with RF-INQUIRY Hi-Q Chokes?

[michael.findley@ni.com]

Normally a 50 Ohm load is used. Refer to CISPR 16 ( A highly overpriced
standard to which most all RF measurements are made.)



                                                                                
                                                       
                      "Tom Rauch"                                               
                                                       
                      <w8ji@contesting.        To:       <rfi@contesting.com>, 
"Christian Buenger" <c.buenger@gmx.ch>                  
                      com>                     cc:                              
                                                       
                      Sent by:                 Subject:  Re: [RFI] Experience 
with RF-INQUIRY Hi-Q Chokes?                             
                      rfi-bounces@conte                                         
                                                       
                      sting.com                                                 
                                                       
                                                                                
                                                       
                                                                                
                                                       
                      02/02/2004 05:02                                          
                                                       
                      AM                                                        
                                                       
                      Please respond to                                         
                                                       
                      Tom Rauch                                                 
                                                       
                                                                                
                                                       
                                                                                
                                                       




> just came across an advertisement of a common-mode choke produced by
> RF-inquiry of Japan. They claim to provide at least 50 dB of reduction of
> common-mode-currents.

By the way, if the common mode source and load impedances are a fraction of
an ohm it is easy to obtain -50dB. If the common mode source and load
impedances (which have nothing much to do with line impedance) are 1000
ohms, we would be lucky to see 10dB.

It depends on how they measured.

73 Tom


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