[vdr] Re: One wire solution

[Olaf Titz <olaf@bigred.inka.de>]

> http://www.bauckhage.com/pdf/digi100.pdf

I don't have experience with that box, but the web page says:
Freq. range Sat1  950-1600 MHz
Freq. range Sat2  1800-2200 MHz
Freq. range terr. 47-862 MHz
the Sat inputs on the box are labeled like this:

|      Inputs      |
|    High band     |
V                  H

and the antenna wall outlets are labeled "DC Blocker".

So most likely the box just remodulates the signals from one
horizontal and one vertical LNB output - both on the high band - into
two different frequency ranges, completely ignoring DC, 22 kHz and
DISEQC; also completely ignoring the low band. Since it's perfectly
possible for the low band to contain digital transmissions - perhaps
more in the future - this is one obvious disadvantage (but it would
perhaps be possible to build such a box with four inputs too).

This could work with VDR when you set a LOF which matches one of the
frequency ranges (e.g. the "vertical" one) and manually correct all
frequencies of "horizontal" transponders to account for the offset.
OTOH it shouldn't be too hard to patch VDR to do this by itself; in
some way just the meanings of the "vertical/horizontal" and
"low/high-band" distinctions are swapped.

Another thought: surely such a device has to be designed to work with
commercial STBs. Do those usually get their transponder frequencies
from the NIT like VDR 1.3 or rely on manual configuration like VDR
1.2? If the former, there should be a way how this works with plain
VDR too.

Olaf