Fm deviation meter

1. How is FM deviation measured?
2. What is a deviation meter?
3. What is FM frequency deviation?
4. How do you adjust FM deviation?

How is FM deviation measured?

f(t) = f0 + ∆f(t) Peak deviation: In the case of frequency modulation, the peak deviation ∆f is the absolute maximum of the difference between the unmodulated carrier frequency (f0) and the instantaneous frequency f(t).

What is a deviation meter?

The deviation meter circuit is AC coupled with a sufficiently low frequency response to pass the CTCSS (PL) tones. The output of the AC amplifier drives a peak detector with a fast attack slow decay characteristic. A buffer stage is provided for driving the meter movement.

What is FM frequency deviation?

Frequency deviation in FM is defined as the way to describe the difference between the minimum and maximum extent of a frequency modulated signal and the carrier frequency.

How do you adjust FM deviation?

Set the modulation frequency to 1KHz and zero deviation. Tune the receiver to the transmitter frequency so that the carrier beat note is clearly audible. Now slowly increase the deviation and you will hear the carrier decrease to zero and then reappear - when the carrier is inaudible the deviation will be 2.405KHz.