Tvheadend

Hey there,

first of all: I like to thank the developers of Tvheadend - it works really fine!

But one thing I'm not able to get running:
I can't find the german private TV-stations like RTL, SAT1, Pro7, Kabel 1, etc. in SD-mode via DVB-S on Astra 19,2E.
What works are for example the channels/services like ARD (Das Erste), ZDF and so on in HD or some other channels in SD.
In my "services-list" i can find the HD-Versions of the private stations, but they are encoded - that's clear.
The "RTL HD"-service for example was found at frequency 10832Mhz as it is described in the Astra-channel list on http://www.astra.de/18946851/senderlisten
When I start the services-search on Mux 12188H (like described in the Astra list for RTL SD) i get the following log-output:

2017-07-04 20:05:09.540 mpegts: 12188H in Astra - tuning on Conexant CX24120/CX24118 #0 : DVB-S #0
2017-07-04 20:05:09.861 subscription: 0735: "scan" subscribing to mux "12188H", weight: 6, adapter: "Conexant CX24120/CX24118 #0 : DVB-S #0", network: "Astra", service: "Raw PID Subscription"
2017-07-04 20:05:19.847 mpegts: 12188H in Astra - scan no data, failed
2017-07-04 20:05:19.847 subscription: 0735: "scan" unsubscribing

This output is true for all muxes containing the private SD channels (for their different muxes).
The network scan on all muxes for services found "only" 902 Services. I have 188 Muxes (one i added manually for testing the 12188H).

I can receive RTL SD and all other privates in SD on my old normal satellite receiver on the frequencies which are documented on astra.de.

My DVB-S card is an "Conexant CX24120/CX24118" (as you can see in the log output).

Has anybody ideas what i can do to receive/find the SD-channels?

Thanks a lot in advance,
Andi