However, indiscriminate use of a noise jammer
may not only be wasteful of costly jamming resources, but may actually compromise the safety of the jamming platform.
Under typical receiver-track-mode operation, an 8-watt wideband noise jammer
will deny GPS reception for up to 40 kin.
The variations in PRF and frequency required the noise jammer
to spread its power across multiple frequencies and PRFs or to track the threat radar's changes.
In addition to the self-protection system already mentioned, the family includes a noise jammer
to counter radars in the 10-, 20- and 70-cm wavelengths.
Further, the preset threshold has no capability to ignore external noise, as might be received from a noise jammer
Key modules in the early 1980s appear to have been the ELT/211 surface-ship ESM, the ELT/318 multimode noise jammer
and the ELT/521 multimode deception jammer.
Wide tuning bandwidth: The wide tuning bandwidth combined with rapid changes in frequency may force the noise jammer
out of the spot noise mode and into the barrage noise mode, which has proportionally less power density.
4-GHz/2- to 18-GHz BM/KJ 8502 fixed-wing RWR, the BM/KG 8601 E/F- and I/J-band repeater jammer, the BM/KG 8606 I-band radar jammer, the BM/KG 8605 I/J-band noise jammer
and the BM/KG 8605 I-band radar jammer.
The science of electronic countermeasures can trace its roots to the simple broadbeam, broadband, noise jammer
, which was an extremely effective system until radar designers developed techniques to counter that type of jamming.
In comparison, the same noise jammer
against an antenna aperture (which produces the compressed beamwidth instantaneously), must also increase its transmitter power to overcome the loss of antenna gain in the sidelobes of the real antenna (on the order of 20 to 30 dB).
The PRC has a reasonably extensive indigenous EW industry, of which, know products include the 2- to 18-HGz CEIEC-921A submarine ESM; the 2- to 18-GHz CEIEC RW-23-1 shipboard radar warner; the I/J-band CEIEC Model 970 battlefield radar jammer; the CIEC GT-1 airborne chaff/flare dispenser; the I/J-band SCRIEE KG 8605 internally mounted airborne noise jammer
; the SCRIEE KG 8606 I-band internally mounted airborne noise jammer
; the 2- to 18-GHz GHz SCRIEE KJ 8605 RWR; the 1- to 18-GHz SCRIEE KZ-8608 airborne ELINT system; the CSTS EAJ-7 shipboard noise jammer
and the CSTC ERC-1 naval decoy launcher.
Direction finding, frequency measurement and dealing with deception and noise jammers
are but part of the EW training that communications operators will need to undergo and this is an area in which several companies have specialised.