Calibrating my limesdr using limesuite

I tried to check quick test for my limesdr using limesuite following all necessary steps from myriad page,were when i do loopback test i was able to get

my RX buffer strength is not strong,but when i hold on my RX port the buffer strength is improvising can it influence a problem in DVB-T ?? when my TX and RX blocks are enabled??Help needed …
Thanks in advance,
Regards Soma Sundaram Ravindran.