H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/38, 325/46
H04B 1/00 (2006.01) H04B 17/00 (2006.01)
Patent
CA 1182176
A BUILT-IN LINEARITY TESTING ARRANGEMENT FOR AN FM RADIO SYSTEM by Abram Froese Larry Yasuo Qnotera Alvin Liebelt Abstract of Disclosure me baseband input to a frequency modulation radio transmitter is switchably connectable to a square-wave generator, the amplitude of the square-wave being adjusted to provide a predetermined deviation of the FM radio transmitter. The output signal of a pilot oscillator is also applied to another baseband input of the transmitter and is subjected to amplitude modulation because of non-linearities which exist in the system and which adversely affect the signal during transmission through the system. At the receiving end of the radio system, the receiver output comprises the pilot frequency and a superimposed amplitude modulated signal which are applied to a product detector. The output of the product detector is a pulsating DC signal comprising a basic DC component, which is representative of the amplitude of the pilot frequency and an AC component, which is representative of the system non-linearity. The pulsating DC signal is applied to one terminal of a capacitor. The AC component appears at the other terminal and is rectified and integrated to obtain a DC signal, the amplitude of which is proportional to the slope component in the system non- linearity. This DC signal is measured by a direct current meter.
394972
Froese Abram
Liebelt Alvin
Onotera Larry Y.
Ael Microtel Ltd.
R. William Wray & Associates
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