Airmec RadiVet Type 211 free download

File name Airmec_211.pdf

AIRMEC RADIVET MODEL 211 PAGE 2 OF 37 www.TheValvePage.Com AIRMEC RADIVET MODEL 211 PAGE 3 OF 37 www.TheValvePage.Com AIRMEC RADIVET MODEL 211 PAGE 4 OF 37 www.TheValvePage.Com AIRMEC RADIVET MODEL 211 PAGE 5 OF 37 www.TheValvePage.Com AIRMEC RADIVET MODEL 211 PAGE 6 OF 37 www.TheValvePage.Com AIRMEC RADIVET MODEL 211 PAGE 7 OF 37 www.TheValvePage.Com AIRMEC RADIVET MODEL 211 PAGE 8 OF 37 INTRODUCTION The RadiVet has been designed and built primarily as a very compact piece of test gear for checking, aligning and locating faults in all stages of FM receivers. The facilities provided also enable tests to be carried out on Public Address equipment, tape decks, and AM broadcast receivers. Basically the RadiVet consists of three independent instruments housed in one case: an AM/FM signal generator, with crystal calibration, an audio oscillator and an oscilloscope. These three instruments, which can be used either separately or in conjunction one another, enable every function of a receiver to be thoroughly investigated. The interconnections required for the different tests are set up by means of switches on the front panel. A brief summary of the facilities of the RadiVet is given in Section 2 from which an experienced service engineer will be able to work out his own methods of employing the instrument. Full instructions for operating the RadiVet to obtain each of the facilities are given in Section 3, and the application of these facilities to testing FM and AM receivers, audio amplifiers, tape recorders and television receivers are dealt with in Sections 4 to 8. A detailed technical description of the circuit appears in Section 9, a specification in Section 10 and maintenance instructions in Section 11. 1. SUMMARY OF FACILITIES The facilities provided by the RadiVet are listed below and further information on voltage ranges, accuracy, etc. is given in Section 10. Signal Generator The signal generator covers the frequency ranges 0 to 15 mc/s and 85 to 100 mc/s, that is the normal broadcast AM band and FM IF band, and the FM transmission band. The output is in each case obtained by mixing the outputs of two oscillators, one of which may be frequency modulated and the other amplitude modulated. The signal may therefore be un-modulated, modulated with FM or AM or simultaneously with FM and AM at different modulating frequencies. In addition, signals in the bands 0-30 mc/s, 45-60 mc/s, 65-80 mc/s and 195-240 mc/s are obtainable at a lower output level (see Sect. 8). The signal generator output is fed through a coaxial cable, to a probe unit which conta