[From nobody Wed Nov  9 14:09:56 2005
Message-ID: <4371EEC2.7030007@plenware.fi>
Date: Wed, 09 Nov 2005 14:42:42 +0200
From: =?ISO-8859-1?Q?=22Sami_J=2E_M=E4kinen=22?= <sjm@plenware.fi>
Organization: Plenware Oy
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To: VDR Mailing List <vdr@linuxtv.org>
Subject: Re: [vdr] VDR and polarization problems
References: <436FD5CD.1060009@pp.inet.fi>	<437061CA.6040107@pp.inet.fi>	<43711A6A.8080602@pp.inet.fi>	<43712325.9080801@iki.fi>	<437124D3.3020603@pp.inet.fi>	<437128CE.2000701@iki.fi>	<437182C4.7050608@pp.inet.fi>	<4371B826.6080707@almamedia.fi>
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Harri Helmroos wrote:

>> #22 Position A
>> #23 Option A
>> #26 Position B
>> #27 Option B
>> # port 1 option a position a
>> # port 2 option a position b
>> # port 3 option b position a
>> # port 4 option b position b

>> The above applies to Biltema 4x1 switch
>> and to my current switch too. Don't remember
>> the name, though. Might have been Digiality or not.
...
>> If the order of ports is different, just edit that.
>> Not that difficult, is it? Just read the diseqc pdf spec. :)

> Very well written and interesting data you got there. But I don't just 
> get it why even this doesn't work, though you mentioned that it works 
> with the biltema stuff as both of mine are of those. Same thing still 
> occurs with both switches, to watch channels with V-pol I first must 
> switch to a H-pol channel.

Hmmmh, in universal LNBs the polarity and hi/lo frequencies
are selected like this:

# command:
#   t         tone off (universal LNB: low freq)
#   T         tone on (universal LNB: high freq)
#   v         voltage low (13V) (universal LNB: vertical polarization)
#   V         voltage high (18V) (universal LNB: horizontal polarization)

You might try to increase the waits (W15 --> W50, for example)
and then try to always first set the high or low voltage, command the diseqc switch
and only finally set the correct voltage for the selected polarization.

> Could this somehow be a limitation of the Skystar 2-pci card?

This might be a hardware problem with your dvb-s tuner card,
or a driver glitch/bug or your LNBs are bit too picky or... Canada!

 > Then
> again, best configuration that actually has worked flawlesly so far with 
> these twin-lnb's is the configuration for a mini-diseqc with A and B 
> commands, but then I'm without the 3rd satellite. Veeery confusing.

Hmmh, why not try to make use of this information?

If your current setup copes nicely with H pol but with
V pol only after viewing a H pol channel try something like this:

# port 1
S1.0W  11700 V  9750  t V W50 [E0 10 23] W50 [E0 10 22] W50 t W50 v
S1.0W  99999 V 10600  t V W50 [E0 10 23] W50 [E0 10 22] W50 T W50 v
S1.0W  11700 H  9750  t V W50 [E0 10 23] W50 [E0 10 22] W50 t W50 V
S1.0W  99999 H 10600  t V W50 [E0 10 23] W50 [E0 10 22] W50 T W50 V

# port 2
S5.0E  11700 V  9750  t V W50 [E0 10 23] W50 [E0 10 26] W50 t W50 v
S5.0E  99999 V 10600  t V W50 [E0 10 23] W50 [E0 10 26] W50 T W50 v
S5.0E  11700 H  9750  t V W50 [E0 10 23] W50 [E0 10 26] W50 t W50 V
S5.0E  99999 H 10600  t V W50 [E0 10 23] W50 [E0 10 26] W50 T W50 V

# port 3
S13.0E  11700 V  9750  t V W50 [E0 10 27] W50 [E0 10 22] W50 t W50 v
S13.0E  99999 V 10600  t V W50 [E0 10 27] W50 [E0 10 22] W50 T W50 v
S13.0E  11700 H  9750  t V W50 [E0 10 27] W50 [E0 10 22] W50 t W50 V
S13.0E  99999 H 10600  t V W50 [E0 10 27] W50 [E0 10 22] W50 T W50 V

# port 4
#Sxx.yE  11700 V  9750  t V W50 [E0 10 27] W50 [E0 10 26] W50 t W50 v
#Sxx.yE  99999 V 10600  t V W50 [E0 10 27] W50 [E0 10 26] W50 T W50 v
#Sxx.yE  11700 H  9750  t V W50 [E0 10 27] W50 [E0 10 26] W50 t W50 V
#Sxx.yE  99999 H 10600  t V W50 [E0 10 27] W50 [E0 10 26] W50 T W50 V

The changes made:

1) Increase all delays from 15ms to 50ms (W50)
2) Always set up the high voltage (V = 18V, v = 13V) (for H pol) first
3) Set up the correct voltage (13V or 18V) only after the whole command sequence.

I suspect that somehow your diseqc switch is not able to hear
the commands unless your dvb-s card sets up the high voltage
for horizontal polarization. This is only a wild guess, though.

-sjm

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