I don't know what exactly does antenna amplifier mean. Is it possible to increase the gain of a Tx antenna ? Where do I connect the antenna amplifier to it ?
If, for example, the Tx has a power of 20 dBm , antenna has a gain of 10 dBi & antenna amplifier "repeater" has a gain of 60 dB "like common cellular repeaters" , what does this gain mean ? Does it mean the antenna gain will be 10+60=70 dBi ? Or does it mean the Tx power will be 20+60=80 dBm ? I am confused !
Another example for Rx antenna, if we have a receiver with a sensitivity of -114 dBm and Rx antenna has a gain of 10 dBi & we connect it to a 40 dB amplifier, does it mean the total sensitivity will be -114-10-40= -164 dBm ? (please ignore the SNR)
What is the weakest possible signal at Rx antenna to be amplified ?
Last example , just to understand what the rule of repeater and its gain is.
If we use a Tx that has a power of -30 dBm at 1000 m, antenna has a gain of 10 dBi, & at 1000 m distance there is a repeater that has a gain of 60 dB, how do I calculate the total gain in this situation ?
Should the total gain at repeater be 10 "antenna" +60 "repeater" ?
Or should we just calculate the resulting power at repeater instead of its gain ? Do we write (-30 "Tx"+ 60 "repeater")"total power" + 10"antenna" ?
Sorry for my long question, I am a beginner , I want to understand .