dB Attenuation and Signal Loss

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dB Attenuation and Signal Loss

 

TV - Receiver Dynamic Range

 

Most TV / DVB-T Receivers have a signal range of -65 to -5dBm.

 

This also corresponds to bars (signal strength bars) which display on a receiver.

 

Bars

Signal

dBm

Percent

0 bars

Low S/N

< -65


1 bars

Minimal

-65 to -55

0 to 17%

2 bars

Normal

-55 to -45

17 to 33%

3 bars

Good

-45 to -30

33 to 58%

4 bars

Strong

-30 to -5

58 to 100%

 

Signal-Strength-DB-Level

 

Passive Splitters

 

On passive splitters there is a signal loss that occurs depending on many ways the signal is being split. So it is important to be aware of this, as this may cause enough signal loss to reduce the signal at the TV.

MOD300-DB-Loss

 

Signal Loss

 

Both outputs connecting into passive or active splitter will create a more balanced system as the increased 10dBm is not necessary

Configuration 1 - Parallel

 

There is 10dbm attenuation (signal loss) when 2 devices are looped. Power needs to be increased to compensate, see Configuration 1

Configuration 2 - Series