Can I connect a receiver with HD recorder (double tuner) to a TVA system

This depends on your type of system with LNB version:

Single LNB version (TVA 65 and SAT 85)

Because the receiver is connected with the single LNB and 1 coax cable, only the recording and viewing combination between all channels on the same transponder is possible.

Twin LNB version (TVA 80 and Premium)

The receiver must be connected to both outputs of the Twin LNB.