Is the box supposed to provide a pass-through signal on the tuners when it is in Deep Standby?

I originally set things up with the aerial connexion going in to tuner1, on to tuner2 and from there to the TV, but when I switched to Deep Standby the TV signal strength dropped to almost absent.

Not a probelm for me, as I'm able to feed the TV via another PVR which does pass-through OK when in standby, but some may only have one aerial feed.