On my Viark 4k I find it often won't lock on certain signals, including those already scanned in, even when the signal is very strong. For example, on 28E, CNN 11671/H and TNT 11582/H. I suspect there's some unwanted unstable spurious signal being generated inside the receiver, which is interfering with the desired signal, stopping it from locking.Yeah I did that but it wouldn't show. Other channels on that Transponder did though. I can only assume channel didn't have enough signal strength and the Droi has a poor receiver compared to the Vu+ (that picked it up fine on same cable connection). I guess wait for a sunny day to rescan or enter the channel from a downloaded list?