Why the singnal of wireless/Tv in db value? and why it is showing in minus(-)?

Why the singnal of wireless/Tv in db value? and why it is
showing in minus(-)?

Question Posted / kamath.sadanand

4 Answers
7343 Views
BSNL, Wipro, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Why the singnal of wireless/Tv in db value? and why it is showing in minus(-)?..

Answer / shivaleela

Here db(logarithmic unit) stands for Decibel. In humans the
audible range of frequencies is usually said to be 20 Hz
(cycles per second) to 20 kHz (20,000 Hz). It may be harmful
for human ear if it exceeds that range.Hence the value of dB
is always -(minus).

Is This Answer Correct ?

18 Yes

9 No

Why the singnal of wireless/Tv in db value? and why it is showing in minus(-)?..

Answer / reza r

Very large and very small values in mathematics can be
mentioned by dB. dB is a logarithmic calculation that
normalizes the value of a factor.

- sign in the value of a signal is because of noting that
the signal is incoming to the antenna (received signal) not
the transmitted one!

Is This Answer Correct ?

1 Yes

0 No

Why the singnal of wireless/Tv in db value? and why it is showing in minus(-)?..

Answer / kashmir singh

The decibel ( dB) is used to measure sound level, but it is also widely used in electronics, signals and communication. The dB is a logarithmic unit used to describe a ratio or it is the unit of sound.
its value is showing in minus(-) because mathematically we take antilog of the value of sound/noise

Is This Answer Correct ?

0 Yes

3 No

Why the singnal of wireless/Tv in db value? and why it is showing in minus(-)?..

Answer / king

db is the unit for electromagnetic signal power
and (- )sign indicates that the power of the signal is too week
i.e in minus side
a lots of amplification stages are needed to make it useful

Is This Answer Correct ?

1 Yes

5 No

Post New Answer

More Electronics Communications Interview Questions

Following is an NSAP of IS-IS, which is legal NET (When area number is 1)? 1) 47.0001.1921.6800.3025.01 2) 0001.1921.6800.3025.00 3) 47.0001.192.168.3.25.00 4) 0001.1921.6800.3025.01

0 Answers

If anybody have technical test papers for HPCL. Pls, mail me on akanksha417@yahoo.com.

0 Answers

what is meant by differential amplifier? what is primary function?

2 Answers

How many Antenna use in 6+6 with 2-way Diversity.

0 Answers NSN,

In C language the condition(4%2==0) and in scanf statement the declaration as %d for integer.Now in the first condition it performs the modulo operator but why it is not so in scanf statement?

0 Answers IBM, TCS,

Explain what is difference between fixed-bias circuit & self-bias circuit?

0 Answers

What does ce mean. You will see it on almost every chip(ic)?

0 Answers

In wave guides tem wave propagation is not exit, give the physical interpretation?

0 Answers

sir i want syllabus for junior engineer &section engineer.

0 Answers DRDO, RRB,

Explain how to program micro controller?

0 Answers

how long has fibre channel been around?

1 Answers

Explain avalanche breakdown?

0 Answers

For more Electronics Communications Interview Questions Click Here