Still in 1965...
The above mentioned smaller Self Protection Jammers (QRC-160-1, and the AN/ALQ-51) were working on the E band, they were capable of countering the SA-75MK Dvina (SA2A/B/F), and the SON4, SON9 AAA radars.
Stand Off Jamming further complicated the air picture, but it required bigger carrier due to its power and size requirement, that was flying outside of the SAM firing zone.
The ALT-6B used the Spot Noise Jamming technique, in the E band to counter the above mentioned threats.
It had hydraulically tuned magnetron to aim its frequency during flight against a specific SAM site.
This technique allowed narrower bandwidth, and greater jamming range.
Limitations were, that against one Dvina fire control radar, you needed to aim exactly two ALT-6B (epsilon/azimuth), and provided protection only if the attacker plane was between the jammer and the site.
TAC used the EB-66E aircraft that carried 34pcs.
Last edited by Hpasp; 02/18/13 08:25 PM.