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History of Radio (1895 words) |
 | V1 is a tetrode amplifier that amplifies the tuned signal from the aerial. |
| When a station is tuned in, the oscillator frequency is also adjusted so that the difference in frequency between it and the tuned frequency is always the same. |
| V1a is the mixer, its output is tuned to the I.F. frequency by L2 and C3. |
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5 (1235 words) |
| The Tuned Radio-Frequency Receiver was in use in the 1920’s after several years of frustration with the crystal radio set, and before Armstrong and others developed the superhetrodyne radio in the mid 1930’s. |
| The basic principle of TRF receivers was that all RF stages needed to be simultaneously tuned to the received frequency before detection and subsequent amplification of the audio signal. |
| As the tuning dials are moved towards higher frequencies, it is necessary to reduce the reaction setting to maintain stability. |
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