antenna-theory.com

[franzellin]

old 2G car phones had an amplifier till 3-5Watt in order to have a good signal,
mobiles now are limited I thing to 0.5 watt, the same for wifi routers

on the market there are amplifiers/repeaters till 10watt

when the router transmits, the waves go through the amplifier and go to the antenna and then in the air, with twice the strenght of signal and reaches a smartphone far away ( I call it the download signal)

once the smartphone receives the signal answers (the upload signal) but his transmit power is only 0.5W it means that his signal is very thin and reaches the router passing through the amplifier that should be bidirectional

I have all kind of repeaters, antennas, but I have the sensation that I am making a theoretical mistake

for instance:

I have a router with 2 antennas , there is no specification that 1 antenna is only for transmitting and the other for receiving, I can suppose that they are both T&R antennas

I can add a first amplifier to the router connected as indicated OUT = Antenna , and a second amplifier inverted, I mean OUT goes to the router instead of the Antenna , in this way the amplifier should amplify the receiving signal to the router

?1) is it a good move or a stupid one?
?2) if stupid please tell me why...



thanks renato

[admin]

It is a stupid one

The transmit side uses a power amplifier but the receiver side uses a low noise amplifier who's figure of merit is Noise Figure (NF)

Both antennas on routers are transmit and receive, you will probably break the receiver if you set it up as you described

[franzellin]

thanks, you saved my router,

only to conclude, an antenna sending an amplified signal is it till able to receive low intensity waves roughly on the same band?
the transmit and receive frequencies are so near that I would suppose that the first covers the second

thanks renato

[admin]

The transmit and receive frequencies are not near, they are exactly the same. When the router transmits it does not try and receive so there is no risk to damage from the on-board transmitter

[franzellin]

thanks