Yeah, due to localized jamming in Iraq (for convoys, using Warlock and better), there were "increasingly sophisticated" systems.
The correct way to make the best IED trigger would be something which required an ongoing cryptographic challenge with nonce or time, so you were safe from both having your circuit cut AND from people finding/replaying your signal.
The correct way to make the best IED trigger would be something which required an ongoing cryptographic challenge with nonce or time, so you were safe from both having your circuit cut AND from people finding/replaying your signal.