Question on RF Linear amplifier

Hello ,

I have just a question concerning RF linear amplifier
I know the problem with feedbak due to delay , nevertheless in the past (for example in Radar) ,feedback was used .
I know Cherry did a study on this problem. (in Audio amplifier people can hear this)
May you try to explain me this problem

By the way May someone may help me to find this article

Cherry, E.M. and Dabke, K.P., "Transient Intermodulation Distortion?Part 2: Soft Nonlinearity," J. Aud. Eng. Soc, 34:1/2, Jan/Feb 1986, pp. 19?35.

Really nobody can help me ?
This problem is very comon in RF amplifier.
Please help me

No feedback is used in RADAR. Linearity is not a problem as all that is needed is to detect the presence of a pulse. Pulse compression methods are FM or PSK which do not need linearity.

The question should address why linearity is desired, and how much.
Is it SSB Power Amplifier in HF band?
Is it multichannel cellular base station?
Is it CATV distribution network?
Definition of linearity requirements also vary depending on the system.

Sophiscated feedback (or, feed-forward) system may be used in linearized power amplifiers.