Main_Diversity

These are the connections of the TRX with the CDU, i think you are working on ZTE, the RX_Main connects the trx with one Antenna and the Rx_Diversity provides connection with the other Antenna to reduce Multipath Fading

jnr,

the “antenna” you are talking about is actually a crosspolar antenna. Physically, it contains 2 antennas (you can see that because there are 2 feeders ports at the bottom of the antenna)

Each port is internally connected to an independant “antenna”. Antenna “a” is polarized at 45°, antenna “b” is polarized at -45°.

The cross polar antennas receives the UL signal from the MS on its two antennas a and b. Both rx signals are different, one gets the 45° componant, the other the -45° componant.
The TRX receives those two signals and COMBINE them, in order to enhance the “quality” of the signal (interference cancellation, combining gain, etc)

in your case, Signal “a” can be called “main”, and signal “b” can be called “div” (stands for diversity). But those are just words. If you invert both cables main & div, it won’t impact anything.

cheers
pix

hi,

Tanuj, i didn’t understand your post. Here are some remarks that might help clarifying.

– for me, “1TX+2Rx” means rx diversity

– “the feeder cable goes directly on the GRFU/DRFU” I don’t know those acronyms… but if the trx is configured as “1TX+2Rx”, then it expects 2 RX inputs. Those 2 Rx inputs cannot be carried by the same feeder.

You have to assume that I’m a beginner and explain everything from scratch, because I am confused !

best regards,
pix

I meant difference received signal strength.