The main disadvantage of direct FM modulators is:
A) they can only work at low radio frequencies
B) they have very limited frequency stability
C) they have insufficient frequency deviation
D) they work reliably only with low-level intelligence signals

Question

Quizplus · Accepted Answer

Direct FM modulators often have very limited frequency stability due to the dependency on the characteristics of the modulating oscillator, which can be influenced by factors like temperature, power supply variations, and component aging. This makes maintaining a stable carrier frequency more challenging compared to indirect FM modulators, which can use frequency synthesizers to improve stability.

The Main Disadvantage of Direct FM Modulators Is