I have a DPP+ twin lnb utilizing the lnb in port to pick up some locals on a second dish. These feed my 522. I hooked up a model 4000 receiver and ran check switch. It sees the lnb as sw64. Everything seems ok. I have read where I can use the legacy equipment, but cannot utilize the lnb in port if you do so. What will happen if I activate the receiver in its current configuration? Do I need to disconnect the second dish from the DPP+? Also, how heat tolerant are the 4000 receivers? Right now, I have it in my attic splitting to two televisions. I live in Texas and it will see some heat up there. Thanks.