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MXG phase noise impairment makes level drop

Question asked by rftester on Feb 26, 2015
Latest reply on Jun 8, 2015 by rftester

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I'm using a N5182A MXG vector signal generator with the phase noise impairment option. When I enable the phase noise impairment the output level drops by 3 dB. The ALC must be off for what I'm doing. It is very inconvenient having to deal with the level change during testing, has anyone else encountered this or found a way around it?

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BoinFinland May 11, 2015 1:33 PM
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Hi RF Tester,

I have no experience with the model you use.
Do you measure wide or narrow band?
I would assume that measuring wide band the power is the same.
For AM noise or fading the peak power is mostly constant but average power can drop quite a bit.
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rftester Jun 8, 2015 8:45 AM
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Hi Bo, thanks for your reply.
I am generating a single QAM, and that ~ 6 MHz BW is what I was measuring. The signal generator is being controlled by a PXB. If the signal generator's phase noise impairment option is turned on while the waveform is playing the level drops 3 dB. If the waveform is stopped, the phase noise turned on, and the waveforem restarted, the level remains unchanged. It is the stopping and starting of the waveform to avoid the level change that is inconvenient.
Don (from Canada)
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MXG phase noise impairment makes level drop

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