Radar jamming
The jammer does not know if their jamming is effective before operator starts changing radar transmission settings.
Using EW countermeasures will give away radar capabilities thus on peacetime operations most military radars are used on fixed frequencies, at minimal power levels and with blocked Tx sectors toward possible listeners (country borders).
Mobile fire control radars are usually kept passive when military operations are not ongoing to keep radar locations secret.
Active electronically scanned array (AESA) radars are innately harder to jam and can operate in low probability of intercept (LPI) modes to reduce the chance that the radar is detected.
A quantum radar system would automatically detect attempts at deceptive jamming, which might otherwise go unnoticed.
Anti-radiation missile (ARM) also known as Home-On-Jam (HOJ) missiles: When a target is using self-protective jamming (SPJ), it essentially broadcasts its position. An ARM could be deployed and take out the jamming source. The missile utilizes passive RF homing which reduces its probability of detection. A countermeasure to ARM is not to use self-protective jamming (one could use stand-off jamming, assuming that the missiles has a range no longer than the radar), or have a decoy taking the missile (such as ADM-160 MALD and AN/ALE-55 Fiber-Optic Towed Decoy). By towing a decoy/jammer, the decoy maintains a realistic Doppler shift (which tricks the tracker) and lures an ARM away from the target.

Stealth: For protective jamming, a small radar cross section of the protected aircraft will improve the jamming efficiency (higher J/S). A lower RCS also reduces the "burn-through" range. 
Stealth technologies like radiation-absorbent materials can be used to reduce the return of a target.

Interference: While not usually caused by the enemy, interference can greatly impede the ability of an operator to track. Interference occurs when two radars in relatively close proximity (how close they need to be depends on the power of the radars) are operating on the same frequency. This will cause "running rabbits", a visual phenomenon that can severely clutter up a radar display scope with useless data. Interference is not that common between ground radars, however, because they are not usually placed close enough together. It is more likely that some sort of airborne radar system is inadvertently causing the interference—especially when two or more countries are involved.
The interference between airborne radars referred to above can sometimes (usually) be eliminated by frequency-shifting transmitters.
The other interference often experienced is between the aircraft's own electronic transmitters, i.e. transponders, being picked up by its radar. This interference is eliminated by suppressing the radar's reception for the duration of the transponder's transmission. Instead of "bright-light" rabbits across the display, one would observe very small black dots. Because the external radar causing the transponder to respond is generally not synchronised with your own radar (i.e. different pulse-repetition frequencies), these black dots appear randomly across the display and the operator sees through and around them. The returning image may be much larger than the "dot" or "hole", as it has become known, anyway. Keeping the transponder's pulse widths very narrow and mode of operation (single pulse rather than multi-pulse) becomes a crucial factor.
The external radar could, in theory, come from an aircraft flying alongside your own, or from space. Another factor often overlooked is to reduce the sensitivity of one's own transponder to external radars; i.e., ensure that the transponder's threshold is high. In this way it will only respond to nearby radars—which, after all, should be friendly.
One should also reduce the power output of the transponder in like manner.

Jamming police radar: Jamming radar for the purpose of defeating police radar guns is more simple than military-grade radar jamming. The laws about jamming police radars vary by jurisdiction.

Jamming in nature: The jamming of bat sonar by certain tiger moth species has been confirmed. This can be seen as nature's equivalent of radar jamming. Similar to human ECCM techniques, bats are found to change their emission lengths to defeat jamming.

See also: 36th Bombardment Squadron – military unitPages displaying wikidata descriptions as a fallback
Active electronically scanned array – Type of phased array radar
AN/ALE-55 Fiber-Optic Towed Decoy – Countermeasure from radar guided missiles
Association of Old Crows – Electronic warfare professional organization
Echolocation jamming – Interference with animal sonar systems
Electronic attack – Electronic device for deceiving detection systemsPages displaying short descriptions of redirect targets
Electronic warfare – Combat involving electronics and directed energy
Infrared countermeasure – Device designed to protect aircraft from infrared homing missiles
Low-probability-of-intercept radar – Radar technology that hides its activity from a detected target
No. 100 Group RAF – Former Royal Air Force operations group
Pelena-1 – Russian ground-based jamming system
Radio jamming – Interference with authorized wireless communications
Suppression of Enemy Air Defenses – Military tactic


== References ==