ON TOUR XT (serv.man4) - JBL Audio EMC - CB Certificate (repair manual). Page 9

 

 

 
 

EMC Report for Harman Model JBL On Tour XT 
File: 3109671LAX-009 Revision 1 

Page 9 of 27 

 

 
4.1.3 

Field Strength Calculations 

 
The field strength is calculated by adding the Quasi -peak reading on the EMI Receiver to the factors 
associated with preamplifiers (if any), antennas and cables.  A sample calculation is included below. 
 
FS = RA + AF + CF  
 
Where   

FS = Field Strength in dB

μV/m 

RA = Receiver Amplitude (including preamplifier) in dB

μV 

CF = Cable Attenuation Factor in dB 
AF = Antenna Factor in dB/m 
 
 
 

Assume a receiver reading of 27 dB

μV is obtained.  The antenna factor of 13.5 dB and cable factor of 0.5 dB 

is added.  The net field strength for comparison to the appropriate emission limit is 41 dB

μV/m.