1. Radar is a RADIO system &, consequently, very easy to block by broadcasting on the same radio frequencies.
2. This applies to both Secondary & Primary Radar.
3. If this was a deliberate attempt to block ALL Radar systems, that would have been easily achievable. In this event, ATC revert to Procedural control - HUGE delays ! Think "volcanic ash clouds".
4. If it was an attempt to block only Secondary Radar, the Primary could (subject to what has already been stated previously) perform as a temporary substitute - BUT, with large delays due to Primary's inadequacies compared to Secondary.
5. Such action by western military agencies is unthinkable. Who were the perpetrators ?
6. Such events more than adequately highlight the situation where Governments are cynically exploiting the need for radio spectrum from mobile phone companies etc. & selling off Public Broadcast (TV & Radio) frequencies &, more importantly,Primary Radar frequencies - without allocating alternative frequencies for Radar use.
This is CRIMINAL & should be stopped, & reversed.