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Microwave RX power

Microwave RX power

Created: Nov 15, 2020 09:44:51Latest reply: Dec 31, 2021 03:55:13 744 12 0 0 0
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Dear community,


Why Rx power in microwave not considered less then -30dn?

Good day!

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wissal
MVE Created Nov 15, 2020 09:49:41

Hello!


dbm: decibel-milliwatt.


It is the measured power referenced to one milliwatt (mW).


Its value is 10 * log[ P(W) / 1mW ]


The Rx level is the strength of the signal that our mobile receives from a BTS (mobile tower). Here, the Rx level stands for Receiver Level.


The mathematical formula to calculate the Rx level is:


RxLev (dBm) = EIRP (dBm) - Path Loss (dB)


EIRP - Equivalent/Effective Isotropically Radiated Power is the amount of power an antenna evenly distributes power in all directions would emit to produce the peak power density observed in the direction of maximum antenna gain.


EIRP (dBm) = Pt (dBm) + Ga (dBi)


i - antenna gain in reference to isotropic antenna

t - output power transmitted 


Path Loss - For a given antenna, the received power is inversely proportional to the distance between the transmit and receive antennas & also to the square of frequency.


Ls ~ d^2 f^2


Path loss - Ls(dB) = 32.4(dB) + 20*log [ f (MHz) ] + 20*log [ d (km)], where 32.4 is a constant of proportionality.


The value of Path loss is always greater than EIRP, hence the Rx level is negative.


Thanks!

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Navin_kay
Navin_kay Created Dec 8, 2020 08:46:44 (0) (0)
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user_4411447
user_4411447 Created Oct 31, 2021 04:24:48 (0) (0)
 
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Chenxintao
Chenxintao Admin Created Nov 15, 2020 09:45:18

Hello User. we are reviewing your question and we will answer you shortly. Thanks.
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3#
wissal
wissal MVE Created Nov 15, 2020 09:49:41

Hello!


dbm: decibel-milliwatt.


It is the measured power referenced to one milliwatt (mW).


Its value is 10 * log[ P(W) / 1mW ]


The Rx level is the strength of the signal that our mobile receives from a BTS (mobile tower). Here, the Rx level stands for Receiver Level.


The mathematical formula to calculate the Rx level is:


RxLev (dBm) = EIRP (dBm) - Path Loss (dB)


EIRP - Equivalent/Effective Isotropically Radiated Power is the amount of power an antenna evenly distributes power in all directions would emit to produce the peak power density observed in the direction of maximum antenna gain.


EIRP (dBm) = Pt (dBm) + Ga (dBi)


i - antenna gain in reference to isotropic antenna

t - output power transmitted 


Path Loss - For a given antenna, the received power is inversely proportional to the distance between the transmit and receive antennas & also to the square of frequency.


Ls ~ d^2 f^2


Path loss - Ls(dB) = 32.4(dB) + 20*log [ f (MHz) ] + 20*log [ d (km)], where 32.4 is a constant of proportionality.


The value of Path loss is always greater than EIRP, hence the Rx level is negative.


Thanks!

View more
  • x
  • convention：

Navin_kay
Navin_kay Created Dec 8, 2020 08:46:44 (0) (0)
good  
user_4411447
user_4411447 Created Oct 31, 2021 04:24:48 (0) (0)
 
(0) (0)
4#
Navin_kay
Navin_kay Created Dec 8, 2020 08:46:56

Microwave RX power-3616237-1
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victorDa
victorDa Created Dec 15, 2020 12:16:31 (0) (0)
 
Navin_kay
Navin_kay Created Jun 6, 2021 06:21:13 (0) (0)
 
(0) (0)
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user_4034933
user_4034933 Created Dec 8, 2020 11:02:00

Thanks for sharing
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Navin_kay
Navin_kay Created Jun 6, 2021 06:21:06 (0) (0)
 
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Navin_kay
Navin_kay Created Dec 17, 2020 03:49:51

thanks all
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user_4411447
user_4411447 Created Oct 31, 2021 04:24:55

Nice
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Mohamed_Ahmed
Mohamed_Ahmed Created Dec 31, 2021 03:55:13

Posted by wissal at 2020-11-15 09:49 Hello!dbm: decibel-milliwatt.It is the measured power referenced to one milliwatt (mW).Its value is ...
well done Wissal
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