1-33. The use of voices to jam voice circuits is babbled-voice jamming. A very effective form
of babbled-voice jamming, called cocktail party, sounds like a crowd of people engaged in
simultaneous conversation. If the jamming signal's strength is greater than the desired message,
it makes reception very difficult. A form of babbled-voice jamming called ___________
___________ is therefore very effective in jamming voice circuits.
(1-33. Answer: cocktail party)
1-34. Recorded music can also be used to jam voice channels. This type of jamming can appear
to be an ordinary broadcast being received on a harmonic to conceal the fact that it is deliberate.
Radio operators can therefore find themselves listening to pleasant ___________
___________ instead of paying attention to important voice messages.
(1-34. Answer: recorded music)
1-35. Other types of jamming used to jam voice channels are the cry of a sea gull, grunting,
applause, the sound of a locomotive, and many others. These forms of jamming, especially in
combination, can degrade reception when low-power transmitters are being used by the target
circuits. Thus, jamming reception becomes much easier when ___________ ___________ are
being used by the target circuit.