Will the Altech 4921 work with my maxview satellite dish which has a dual LNB as I also have my caravan setup for Foxtel Thanks
Yes it will. To make things easier you can also purchase a multiswitch. That way you can have two cables going to the Foxtel box and one to the VAST.
My Altech DSD4121 is playing up if I replace do I use the same Vast Smartcard? Thanks
No, you won't use the same card. If you order a new box it will come with a new smartcard which is easily registered at www.mysattv.com.au
The replacement model is here - https://www.satplus.com.au/products/altech-4921-rv-vast-certified-decoder-twin-tuner-pvr-ready?variant=31261739253895
Do smart cards have to be renewed
They need to be re-cativaed every 6 months.
You go to www.mysattv.com.au to renew.