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Unable to view 140 MHz IF Frequency on E4407B Series Spectrum Analyzer

Question asked by alighumman on Apr 27, 2015
Dear All
As I posted in Subject I am unable to view the IF frequency(70-140 MHZ) on my Spectrum. even I tried to give the signal direct from IF Combiner, Direct from Modem output, but nothing could found on spectrum. I changed the spectrum with an other one getting same problem. It is working good for C Band Upper & lower portion. My observation is this I am doing some wrong settings of spectrum.Settings are Given Below

Center Frequency 140MHz
Span- 100-800 MHz
Resolution Bandwidth 100 KHz
Video Bandwidth 100Hz
Sweep 3 s
Scale 4 db                       

Suggest me Please 

Thank You and Regards,