Duh. 2 days of hunting, and I find the problem right after I post - typical.
I used the wrong order of magnitude for the frequencies (incl. LNB) and
symbol rate.
And that although I in the beginning tried to make extra sure they are
correct, remembering that it was a major problem a few years ago when I
implemented the original DVB support for MythTV. The MHz vs. KHz vs. Hz
is a mess, same for symbolrate.
Correct is, for 12817 MHz and Universal LNB, to tune to 1587000, LNB
hiband true, in my case with pol H and symbolrate 27500000.
// LNB
boolean hiband = false;
int frequency = c.frequency;
final int lnb_low_val = 9750000; // Universal LNB
final int lnb_high_val = 10600000;
final int lnb_switch_val = 11700000;
if (frequency >= lnb_switch_val)
hiband = true;
if (hiband)
frequency = frequency - lnb_high_val;
else
{
if (frequency < lnb_low_val)
frequency = lnb_low_val - frequency;
else
frequency = frequency - lnb_low_val;
}
int satNo = 0;
CoreServer.me.debug("Tuning to " + c.frequency + " (" + frequency
+ " considering LNB), LNB hiband " + hiband
+ ", pol " + (polarity_v ? "V" : "H") + ", symbolrate " +
symbolrate);
myFrontendFD = tuneToNative(myFrontendFilename, frequency,
symbolrate, polarity_v, hiband, satNo, false);
tuneToNative:
...
p.frequency = frequency;
p.u.qpsk.symbol_rate = symbolrate;
...
says: Tuning to 12187000 (1587000 considering LNB), LNB hiband true, pol
H, symbolrate 27500000
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