Sirena

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	To oppose or discuss a nomination, please go to CZ:Proposed for deletion and follow the instructions. For the monthly nomination lists, see Category:Articles for deletion. Sirena was an early series of Soviet and Russian radar warning receiver]]s, devices with Sirena designations first were reported on the MiG-21 (fighter)]] (Western: MiG-21 FISHBED]]). The model numbers are in the SPO series. The SPO-10 is described as at the rough technology level of U.S. Vietnam War]] era equipment. They are able to recognize different Western threats. Other variants, including the model 3M with no blind spots, have been described on the MiG-23 (fighter)]], MiG-25 (fighter)]] and reconnaissance aircraft (Western: MiG-25 FOXBAT]]. Another was on the Yak-28 (bomber)]] (Western: Yak-28 BREWER]]) electronic warfare]] variant. There is also version for the Su-25 FROGFOOT]] The SPO-15LE SIRENA is on the Su-22 (fighter)]] (Western: Su-22 FITTER]]), an upgrade of the Su-17. References