I landed in this thread because I just got a brand new Edison OS Mio+ with TNAP and I've been losing my damned mind trying to diagnose why it's missing horizontal transponders so often. Often it fails to see any H transponders when I do a "horizontal and vertical" blind scan, but forcing a horizontal scan seems fine. Other times it's almost like it's missing the higher band somehow. I tried to manually force it to scan a transponder I know is there (Galaxy 16, 12095 H, where Infowars lives) and it simply fails to see it.
When I first got the receiver everything seemed to be OK, but I may have been lulled into a false sense of security by not noticing that it was missing transponders, or by dumb luck (sometimes it seems to work OK, or mostly OK). I was also switching between two LNB's and thought maybe that was the problem, but I don't think it is.
I may make a tap for my coax and connect an oscilloscope to it so I can confirm that the voltages and 22 KHz signal are what they should be. I might check the voltages at the end of the line, too. I noticed that there's a setting in the custom tuner settings for increasing the output voltage, but if I try to use any custom