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NASB NEWS LETTER...,.Feb 15, 1940,•♦.Page 2 of problems caused by the variation of amplitude at high powers are eliminated* Linearity need not b® maintained beyond a limited degree both in transmitter radio frequency sections"and receiver radio frequency and intermediate frequency sections. In some respects it is almost a dream come true to the operating engineers. Now having examined the advantages of this system, let us mention a few of the disadvantages. In the first place a wider band is needed for each allocation (200KC for frequency modulation, 30KC for amplitude modulation of equal fidelity). In the second place there will be a very definite adjacent channel problem because the action of the limiter tends to nullify the selectivity curves of the radio frequency and intermediate frequency sections. In the third place, service area is limited to about 100 miles over flat terrain (note that trans¬ mission is possible beyond the first horizon). However, frequency modulation will give more coverage per watt up to a oer^aln point. And in the fourth place the receiver tuning problem is rather difficult Because of shape of the discrimination characteristic, each station comes in at three points, two of them giving rise t°*ather poo reception. (One solution is the use of push button tuning, with all its evils) With the above material in mind, let us raise two more questions. First, does the listening public want^^fidelit^al ^ second, cannot amplitude modulation transmit as high fidelity as frequency modulation 1 ? The widespread use of tone controls on ^e fadioe of present day leads us to wonder if high fidelity is realiy desired. It is true that the high tones in most receivers are unpleasant to listen to because of distortion and unequal distribution. average receiver outs off between 4,000 and 5,000 cycles a true picture of the high tones is not presented, especially w&en the bass is often attenuated at the same time. However, the economic demand. 8 for thepoor present day receivers is further reason to wonder about the acceptability of high fidelity. The fundamental listening habits of the American people are tied up play bridge or engage in other diversions. Furthermore there is the question a 8 g m i 1 1ed* at its normal broadcast stations \ s . oonsldsratlon they most SU'diu “ STSS old question of quality ««»• quantity. As pessimistic as this may seem it does to° s' hsunsu^y^j .gs-