Thanks Chuck for Your answer.
I wanted inputs shorted together only. 8 outputs are connected simply to 8 inputs of AFE, same as in typical application. Doing so, I've got 1 common input for 8 TGC signal chains. I suppose to obtain this way additional 9 dB increase in SNR after summing and averaging AFE's outputs in digital processor. But of course - as You noted - channel count is reduced 8 to 1.
Recently, I've done some measurements and it seems that T/R Switch works well with inputs shortened together.
Thanks,
Damian Cacko