If you use those plastic insulation troughs and overlap the top one of the lower ones even if rain should sneak up past the shingles, past the builders felt it will fall on the plastic trough and be carried out past the building envelope.. 1  Reply. 2  Reply to Original. 3  Print this page. 4  Email this Message.
Double-sideband suppressed-carrier transmission. Double-sideband suppressed-carrier transmission (DSB-SC) is transmission in which frequencies produced by amplitude modulation (AM) are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed.
DSC is a paging system that uses data signals to automate the transmission and reception of calls on VHF marine radio channel 70. Every DSC radio has a unique number, which you use to call other radios, just like a mobile phone.However, unlike mobile phones, DSC allows you to call every other radio in range at the same time if you are in trouble.SC also offers the ability to send and receive GPS positions-all DSC radios can be connected to a GPS receiver. A DSC message is a brief burst of digitised information transmitted from one station to alert another station or stations.