Adi,
Keith is (of course) correct that the thicker ‘back end’ of the SMA on the type of splitter where both pigtails originate at the SMA (as opposed to being spliced in part way along the cable) won’t fit into the cutout in the Rosetta Bridge. I suppose we should refer to this type as a ‘V’ splitter rather than a ‘Y’ splitter.
It does however fit perfectly in the antenna cutout underneath the Raspberry Pi, with the pigtails routed out through the small cutouts beneath the USB / Ethernet Ports at the other end to the SDRs.
Apart from the extra dongle reporting in the USB devices section at the bottom of the Home Screen, there is no other indication until 978MHz data is received, when this will be reported in the ‘ADSB’ row of the Homescreen (see screenshot). (On that occasion BTW, I didn’t get enough data to give me a full weather picture and haven’t been back south since).
Regards
Peter