Some more observations: 1. On a transponder of known SR 7120, the tuner will lock when instructed the SR is in the range +/- 100 of that centre value - much more tolerant of an off-spec SR than my Sf4008. A good thing in some ways, but... 2. If the tuner itself has a tolerance of +/- 100ksps, then why the hell this +/- 200 ksps on a transponder? It will store channels in the list it itself cannot lock (& I have witnessed that). It's either got 6 legs, or is just plain stupid.