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Two tone testing basic doubts

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ku637

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Hi,

This may be a stupid question..but im lacking the knowledge ..

Can somebody tell me ..How in two tone tests the spacing between input frequency is determined ..ofcourse while following defined test procedures and considerations such as adjacent communication channel locaion in receviers may affect the decision ,i suppose..

Other than that...Say i want to know whether as we are increasing the spacing or decreasing the spacing , whether the Intermodulation Products generated will be decreased or increased ??

Thanks
 

There's no consensus way to space the tones. If they are relatively close together you can see the tones and intermods on spectrum analyzer with small span and small RBW setting. 1 MHz spacing is somewhat common. The level of the intermods should not change with the tone spacing.
 
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The two tones should not be interrelated, i.e. not 1 and 2 MHZ, rather 1.1 and 2.1 MHZ. both they and their i/p products should all fall within the passband of the system. It is difficult to add two RF sources and keep the i/ps down to -120 dBm without stop filtering, so the tones need to be "filterable" from each other.
Frank
 
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