It is way easier in DCS than that. As per a 3rd party developer, which unfortunately I cannot find any more, every aircraft has a jamming flag which is either on or off, nothing in between. That means every jammer has the same strength and every jammer is noise jamming only, without any directional limitations.
Now it is up to the module itself, how it deals with a jamming aircraft. As noise jamming basically floods the range information with an own generated signal, result should be range information lost. In the MiG-21 and some other modules, this is represented by multiple contacts in a straight line from the target. This is also verified by the real MiG-21 manual. In that aircraft, you can engage a jamming filter, which will reduce the radar picture to one contact again, but displayed in the middle of the radar screen, hence still no range information.
In the JF-17, it seems the lost range indication is displayed by a jumping target, which also seems a plausible reaction. In all teen series modules, except the F-15, this effect is not modeled, hence they have a huge advantage, as they still will see the correct range. To be honest, this is a total laziness and should not make it through QA, but that is not my decision.
All in all DCS is very restricted when it comes to jamming. Other jamming modes are already 50 years old and older and by now disclosed. See THIS post by Hiromachi about the SPS-141 pod of the MiG-21.