Laboratory Jottings

Radio Record, Volume IV, Issue 36, 20 March 1931, Page 9

Laboratory Jottings

The Reesonator BE. have received from IL. B. Scott, ; Ltd., Christchurch, a Reesonator, and during the last few weeks had an opportunity of trying this on several sets. The Reesonator is a compact device which is fitted usually in series with the aerial and the aerial binding post of the set. The apparatus is small and well finished. Due to the single dial control it is not always posisble to have fullest efficiency from all four stages such as one finds in a normal a.c. receiver. The Reesonator tunes the first stage and adjusts it to. any length of aerial. We shall not here enter into the internal construction of the device,. but rather state the results obtained with it. In this respect our tests were conclusive, for when the , set and the Reesonator were both balanced up the measured signal was greater than without the device. This ‘improvement was apparent to varying degrees over all. frequencies. It sharpened selectivity, but not to the extent by which it improved sensitivity. Adjustments have to be made on every station tuned in. The Reesonator. is theoretically sound, and in practice the theoretical conclusions are justified. It is, of course, of no use with multiple dial recelvers, nor upon certain receivers which incorporate a balancing condenser in the aerial circuit, The New Yealand agents supply a list of the sets for which it is recommended, but ~ it can be used to advantage with certain other sets. =