[mythtv-users] Fwd: Unicable problems

Matthias Thyroff matthias at thyroff.net
Mon May 23 19:55:13 UTC 2022

Hello everybody,

let's see, I am still having problems with Unicable/SCR on my mythbox.

I don't find anything almost on the internet regarding mythtv and 
unicable, nothing very recent, is anybody using this?

My problem is that even if I have several receiver cards, I can only 
tune in to one channel.

I have tried my own suggestion from below and created a second 
videosource... the same, if I record one channel, I also can watch only 
this channel even though I have more than one receiver card.

In my original mail I forgot to mention: I am on myth version 0.31, on 
ubuntu focal.

Is Karl Egly here? I saw that the original unicable patches came from 
him, I wonder if this part of the code is alive...

Thanks for all suggestions in advance,


-------- Weitergeleitete Nachricht --------
Betreff: 	Unicable problems
Datum: 	Wed, 18 May 2022 23:14:27 +0200
Von: 	Matthias Thyroff <matthias at thyroff.net>
An: 	mythtv-users at mythtv.org

Hi everybody,

after years using my mythbox with great success and relatively little 
suffering, I had to move my server to a location a bit further away from 
the sat dish and there is only one cable available so I decided to 
switch to unicable and this is quite a headache... I think I have 
several problems, I am not even sure where to start. Maybe I first 
describe what I have:

I have a Selfsat H50DCSS antenna - a flat satellite antenna with 
incorporated 2x legacy and 1x unicable connections.

I have the unicable connection fed through the window and there 
connected to the inhose coax cable that originally was laid for cable 
tv. At the location of the receiver at the other end of that cable, I 
have a 1-to-4 splitter (alternatively 1-to-2), connected to my SAT 
inputs - a digital devices cine S2 V6.5 card plus one DuoFlex S2 
extension card (which does not seem to work, I keep that pending for later).

I am also running four loopback devices (link 0:4, 1:5, 2:6, 3:7, this 
is working) .

Then I have four input cards defined, one for each loopback device, from 
adapter 4 to 7.

Card 1: /dev/dvb/adapter4/frontent0; type DVB-S, delivery system dvb-s2, 
DiSEqC Unicable (Userband 0, 1210MHz, Pin -1, repetitions I tried 1, or 
9, or 15, works all the same), type LNB (Universal-LNB (Europe))

Card 2: same for adapter 5, except Userband 1, 1420.

Card 3: same for adapter 6, except Userband 2, 1680,

Card 4: same for adapter 7, except Userband 3, 2040.

Video Source, one defined. Name "Unicable". Only EIT, frequencies 
europe-west, etc. etc.

Input connections: Card 1 and 2 connected to unicable, card 3 and 4 for 
now to "nothing", for later trouble shooting (these to cards error out, 
the other two cards show as available in the frontend).

Input connections are configured fast tuning "never".

I think that is a relatively complete description of the setup.

Scanning for channels was quite difficult - I could never do a complete 
scan (tuned), so I switched to a legacy input on the antenna, then I 
scanned, and once I had the transponders, I could switch back to 
unicable and do a full scan of all known transponders. I would get about 
600 channels less and many transponders which would have signal on the 
legacy output of the antenna do not have signal on the Unicable output, 
but nothing important seems to be missing, so that is OK for now. I also 
have optimized the antenna orientation with a sat finder, I think that 
made it much better. With the 4x Splitter while scanning, I get about 
64% Signal and S/N of about 25%, if that means anything. Reception seems 
to be stable for now.

Several things seem to not work very well, but right now only one 
problem is consistant and (finally, thanks for reading up to here) I 
dare to ask for help:

It seems I can only watch or record one channel even though I have two 
working cards. Once a program is recording, I can still enter live tv, I 
see the same channel as is recording, I can switch between the two 
sources (Called SAT#1 and SAT#2), but I cannot change channel, neither 
on the card busy with the recording (I have configured the input to 
allow for 2 concurrent recordings, so I should be able to switch to 
another channel on the multiplex). nor can I change the channel on the 
second card, it will also only tune to the channel that is currently 
recorded on the other card.

One solution that occurs to me is to create another video source for the 
second card - I have not tried, I do not know whether that would work 
but that was not necessary in the past, one video source would work for 
several tuner cards. So I hope to get a better suggestion from you.

Thanks a lot in advance!


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