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IMD Spacing for a Two-Tone test (+/- 1.8MHz ?)

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RFegg

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My input signal is a multi-channel/carrier OFDM. Each channel have 5MHz bandwitdh.
Now, I would like to simulate a 2-tone test for its IMD. I plan to measure the 3rd order at say +/-0.2 MHz offsets from the edge (4.8MHz and 5.2MHz).
My computation is a spacing of Fcarrier +/-1.8GHz, in order to create the 3rd order tones.

Is this correct?
 

Hello Chuckey,

here is my sample scenario. my channel is 5MHz operational BW. normally the specified measurement for shoulder distance (i think i was incorrect when i'm referring to as 3rd order, sorry for that) is 0.2MHz offset from the edges of the BW. Example my carrier is 2GHz centered in a 5MHz BW. I would like then to measure the distortion level at 2GHz-2.5MHz-0.2MHz at the low side and 2GHz+2.5MHz+0.2MHz for the high side. Since in MWO, they only have nth order IMD testings, I have to adjust my input tones such that their 3rd order IMD's are the low side and high side. my overall band inclusive of the side is 5+0.2+0.2=5.4MHz...divide it by 3 gives me 1.8MHz seperation...
 

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