To clarify what everyone else has been saying, You cannot disable the nightly update, you can only specify when it occurs.
The receiver will go into standby after the nightly update - you cannot prevent that, but you can program an auto tune timer to fire 30 min to 1 hour after the nightly update that will re-awaken the receiver.
Combining that with turning off the inactivity standby, you should rarely discover the receiver when it is not pumping out programming.
The receiver will go into standby after the nightly update - you cannot prevent that, but you can program an auto tune timer to fire 30 min to 1 hour after the nightly update that will re-awaken the receiver.
Combining that with turning off the inactivity standby, you should rarely discover the receiver when it is not pumping out programming.