i have an openbox s9 that i was going to take outside and try and bring in the amc3 rtn mux 4080 and found out that the openbox will not work with an exstension cord,as i have an adapter on the end of the power cord that came with the unit.I have another receiver that is standard definition,but is it any other way that i could use my sd receiver to at least to try and line up this transponder?