| 摘要 |
PURPOSE:To decrease the time of inspection and to simplify a switch control operation, by modulating plural high frequency oscillators corresponding to plural tuners by means of audible frequency oscillators of different frequencies and applying the outputs of the high frequency oscillators to a wireless amplifier at one time. CONSTITUTION:An inspecting device 10 is connected to an amplifier 3 for inspection. The audible frequency oscillators F1, F2 and F3 are provided to oscillate signals of different audible frequencies, and the outputs of these oscillators are fed to high frequency oscillators RF1, RF2 and RF3 corresponding to tuners respectively. The outputs of these high frequency oscillators are fed to a mixer M1 via corresponding attenuators A1, A2 and A3 respectively. The make and break of these attenuators are controlled by a switching circuit S. The amplifier 3 is provided with tuners CH1, CH2 and CH3, reception display lamps L1, L2 and L3 corresponding to the tuners, a mixer M2 which mixes the output of these tuners, an amplifier A which amplifies the output of the mixer M2 and a loudspeaker. |
