[mythtv] Ticket #1945: DVB-S/diseqc patch

Zdzislaw Gorlicki zdzisekg at comcast.net
Thu Jul 20 02:57:43 UTC 2006

For whatever reason, I am unable to switch to Port #2 of my diseqc

My Setup:
Genpix->Rotor->2 port diseqc->LNB's

Any pointers?

-----Original Message-----
From: mythtv-dev-bounces at mythtv.org
[mailto:mythtv-dev-bounces at mythtv.org] On Behalf Of Mark Buechler
Sent: Monday, July 17, 2006 12:55 PM
To: mythtv-dev at mythtv.org
Subject: Re: [mythtv] Ticket #1945: DVB-S/diseqc patch

I've been testing this branch for several days now very successfully. My
setup is as follows:

1. Quad (circular/linear) LNB behind a rotor configured for 8 orbital
locations ranging from 61 degrees to 130 degrees (lower ones not tested
due to an annoying tree in my yard). Between the LNB and the rotor is a
4-port DiSEqC switch, two ports in use from the quad-LNB. 

2. Single LNB on a stationary dish hanging off of port 3 of the 4-port
LNB behind the rotor.

3. Two sources connected to a single stationary LNB (each source with a
different LOF).

4. Two LNBs connected to a stationary dish configured with two sources
available on two DVB cards. Connecting these LNBs is a built-in 2-port
DiSEqC switch. One source is shared with the #2 above. These LNBs are

I have a total of 4 DVB cards in use (Genpix, SkyStar2, 2x Twinhan) so
my setup is not trivial. As far as I've tested, I've only seen one issue
wrt to the two Twinhan cards connected to the bandstacked LNBs and
2-port switch where the switch did not switch properly. I've not been
able to reproduce this. 

I have two suggestions for this branch:

1. Allow a rotor position of "none" to be entered in for an orbital
location which would result in the rotor not moving for a given switch
position. This is handy for my #2 configuration above. 

2. (Optionally) execute any DiSEqC switch commands on every retune of
the DVB card. This would hande the case of stubborn switches which
sometimes fail to switch on the first command (or repeat afterwards).

- Mark.
On 7/13/06, MythTV <mythtv at cvs.mythtv.org> wrote:
#1945: DVB-S/diseqc patch
Reporter:  yeasah at schwide.net  |        Owner:  danielk
     Type:  enhancement         |       Status:  new 
Priority:  minor               |    Milestone:  0.20
Component:  dvb                 |      Version:  head
Severity:  medium              |   Resolution:
Comment (by danielk):

(In [10493]) Refs #1945. Applies modified retune patch.

The Retune() function was using prev_tuning for retuning, but this only
gets set when the hardware tells us the tuning has been successful. This

adds another variable, desired_tuning, which gets set whether or not the
tuning has been successful the first time around, and uses this for

Ticket URL: < http://cvs.mythtv.org/trac/ticket/1945>
MythTV <http://www.mythtv.org/>

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