I well remember the 'exceptional ECM capabilities' of the F3. Without doubt it was quite the worst fighter radar I ever saw in a jamming environment. In fact, in the early days, a co-channel radar or most F-16 radars would remove all the plots on the screen without setting a jamming spoke.
It was a great tribute to all who strived to improve it that the F3 at the end of service became an effective AD fighter.