The development of distributed element filters was spurred on by the military need for radar and electronic counter measures during World War II . Lumped element analogue filters had long before been developed but these new military systems operated at microwave frequencies and new filter designs were required.
22.
The F-101 was the oldest and was possessed by three Air National Guard units, plus the Air Defense Weapons Center at Tyndall AFB . The F-101s at Tyndall were used mainly as simulated target aircraft employing electronic counter measures ( ECM ) and for towing targets for testing and training.
23.
Externally, the aircraft has a modified centerline pylon to enable carriage of many types of test and operational stores such as the ALQ-167 Electronic Counter Measures ( ECM ) pod, which is programmable with a wide variety of electronic jamming techniques as well as an ALE-40 chaff and flare pod.
24.
This requires the deployment of additional aircraft to engage targets that would normally require a single non-stealth attack aircraft . This apparent disadvantage however is offset by the reduction in fewer supporting aircraft that are required to provide air cover, air-defense suppression and electronic counter measures, making stealth aircraft " force multipliers ".
25.
Being one of two reconnaissance wings supporting SEA there were few military operations that did not involve the 460th TRW . Not only did the 460th TRW provide electronic and photo reconnaissance, the Wing s electronic capabilities allowed it to provide electronic counter measure support to B-52s returning from striking targets in North Vietnam.
26.
The electronic counter measure technologies gave birth to the idea that, because a guided missile ( such as a guided artillery shell ) is far more accurate than an unguided missile ( such as an unguided artillery shell ), warships should now be designed to outmaneuver their enemies and get to a better position first.
