Introduction advertising unit Structure

4.3.2 Disadvantages, Demerits or Limitations of Radio 
Advertising 
 
Radio advertising has the following disadvantages, demerits or 
limitations : 
1. The message given by radio advertising is short-lived. 
2. It is costly and is beyond the reach of small and medium sized 
advertisers. 
3. It only appeals to the sense of hearing and thus does not portray 
visually a picture of the package of the product. 
4. It is not suitable for all kinds of products, such as industrial goods 
which are not needed by the average radio listener. It is useful 
only for the goods of common use. 
5. Radio advertisements are very brief and thus details cannot be 
elaborated. 
6. Since there is a multiplicity of advertisements in a very short 
time, it is most likely that the listener may forget the name of the 
product. 
7. There is no possibility of demonstration in case of radio 
advertising. 
8. It is a selective media of advertising. 
FM broadcasting :
FM broadcasting is a broadcast technology 
pioneered by Edwin Howard Armstrong that uses frequency 
modulation (FM) to provide high-fidelity sound over broadcast 
radio. 
The term "FM band" is effectively shorthand for "frequency band 
in which FM is used for broadcasting". This term can upset 

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purists because it conflates a modulation scheme with a range 
of frequencies. 
Modulation characteristics : 
Frequency modulation (FM) is a 
form of modulation which conveys information over a carrier 
wave by varying its frequency (contrast this with amplitude 
modulation, in which the amplitude of the carrier is varied while 
its frequency remains constant). In analog applications, the 
instantaneous frequency of the carrier is directly proportional to 
the instantaneous value of the input signal. This form of 
modulation is commonly used in the FM broadcast band.