Principles of communicationEasy
Question
A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.
Options
A.10.62 MHz
B.10.62 kHz
C.5.31 MHz
D.5.31 kHz
Solution
For low pass filter, frequency greater than 
can′t pass trhough filter
⇒ f <
⇒ f < 
= 4 × 104 Hz
= 40 KHz
in given options maximum frequency below 40 KHz is 10.62 KHz
can′t pass trhough filter⇒ f <
⇒ f < = 4 × 104 Hz = 40 KHz
in given options maximum frequency below 40 KHz is 10.62 KHz
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