From Longman Dictionary of Contemporary Englishscramblerscram‧bler /ˈskræmblə $ -ər/ noun [countable] TCBTCTa machine that mixes up a radio or telephone message so that it cannot be understood without special equipment
Examples from the Corpus
scrambler• I, apparently, am a scrambler.• There's noticeably less equipment hanging from a scrambler, but pound for pound there will be more fleecy material visible.• Some one invents a scrambler device so people can use their Cellnet phones without the opposition listening in.• Ben's greatest wish is that when he grows up, he becomes a professional scrambler.• But cost is holding back a rapid introduction of the scramblers.• She shrugged, went over to the bidet, washed herself and inserted her tiny scrambler.• The Navy had dispatched a portable KYX-2 field-unit scrambler.• Luckily for us scramblers, there is a group even further down the mountain social scale. 