ANSWERS TO CORRESPONDENTS

Radio Record, Volume I, Issue 28, 27 January 1928, Page 13

ANSWERS TO CORRESPONDENTS

R. W. (Hawke’s Bay).-Best to make your kit up as recommended by the makers, then you will not be likely to have any trouble. When you. have got used to the correct working, and know what it is capable of, then you will be able to try alterations and judge of their value. "Radiobug"’ (Nelson).-A loudspeaker would not be suiliciently sensitive for testing condenser capacity. W. MeN, (Greymouth).-One of the wavelengths ou which you receive 4YA is a ‘‘harmonic.’?’ Harmonics are simply sub-multiples of the fundamental wavelength. The wavelength of 4YA is 463 metres, and the sccond harmonic is found by dividing this by two, giving 231.5 metres. To determine the fourth harmonic divide by four, the sixth, divide by six, and so on. Increasing your detector voltage from 16$ to 22; may be an advantage, but you yourself can judge best by the result, especially as no’ details are given, The higher voltage will ‘certainly not harm the valve.