Ok, I will try with an attenuator, but Isuppose I can work too(while I
getan attenuator)with two antennassetting the proper gain for each
one, but now I have the nextquestion: Independently if Iwork with
attenuator or antennas,whythe gain affects the spectrumand shape of
the received signal?
Without seeing the details, I can’t comment in detail.
But as you increase the RX gain, more of the weaker components of the
signal start to rise above the noise floor of your configuration, so you
see them. As you increase gain further, depending on the strength of
the TX signal, you end up with the amplifier operating in a non-linear
thus distorting the signal.