The SA-75MK Dvina (SA-2B/F) system used in North Vietnam had several components.

P-12 (Spoon Rest-A) target acquisition radar used the A band (VHF, metric wavelength).

RSNA-75M (Fan Song F) fire control radar used the same E band (10cm wavelength) as the AAA fire control radars, but it had a TWS (Track While Scan) target tracking method, using two separate antenna, that use two separate frequency.
It means from EW point of view, that you need to jam both flapping antenna beam at the same time.

Free SAM Simulator, "Realistic to the Switch"

(U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.)

Book from the author - Soviet Nuclear Weapons in Hungary 1961-1991