21. Other techniques, such as phase modulation or changing the phase of the carrier signal , are also used. 22. T-carrier and E-carrier signals are transmitted using a scheme called bipolar encoding, a . k . a. 23. In June 2007, the station went silent, broadcasting only an extremely low-power carrier signal with no modulation. 24. The receiver locks onto the larger carrier signal and hence will ignore the FM signal with information. 25. The Armstrong method begins by generating a carrier signal at a very low frequency, say 500 kilohertz. 26. If the dBc figure is negative, then the relative signal strength is less than carrier signal strength. 27. This carrier signal is applied to two stages in the transmitter : a balanced modulator and a mixer. 28. Because of the orthogonality property of the carrier signals , it is possible to detect the modulating signals independently. 29. If the dBc figure is positive, then the relative signal strength is greater than the carrier signal strength. 30. Prior to the 1970s, WSRN operated as a carrier signal broadcast to the campus of Swarthmore College only.
