[mythtv-users] No live tv and not recording

[Klaus Becker]

Le mercredi 14 mars 2018, 19:23:57 CET Klaus Becker a écrit :
> Le jeudi 15 mars 2018, 02:17:36 CET Stephen Worthington a écrit :
> > Yes, that is a Universal LNB, with two local oscillators.  So the low
> > and high frequencies are what you need.  The switch frequency is not
> > defined by the LNB - it has to take into account the capabilities of
> > your DVB-S2 cards and the highest and lowest frequencies you want to
> > receive from your satellites.  The DVB-S2 cards will have a
> > specification for the frequency range they support.
> > 
> > The way it all works is that the frequency of the satellite
> > transmitter (TF) gets mixed in the LNB with the local oscillator
> > frequency (LOF), and that produces signals at frequencies of TF+LOF
> > and TF-LOF on the aerial cable down from the LNB.  The TF+LOF signal
> > is a very high frequency that is probably too high to even propagate
> > well down the aerial cable, and is so high that your DVB-S2 card will
> > not see it either.  The card may have a filter circuit to block it if
> > necessary.  The TF-LOF signal is the one the card needs to be able to
> > receive.  My TBS 6909 DVB-S2 card can receive 950 - 2150 MHz, and most
> > consumer style DVB-S2 cards will have a very similar frequency range.
> > So, using those numbers, you need to have TF-LOF in that range, so
> > using your low LOF frequency of 9750 MHz, the DVB-S2 card will be able
> > to receive from transmitters in the range 10,700 MHz - 11,900 MHz.
> > Using your high LOF frequency of 10600 MHz, the card will be able to
> > receive from transmitters in the range 11,550 MHz - 12,750 MHz.  There
> > is an overlap in the middle, so transmitters in the range 11,550 MHz -
> > 11,900 MHz are able to be received using either the low LOF or the
> > high LOF.  So the switch frequency where reception changes from using
> > the low LOF to the high LOF needs to be set in that overlap range - I
> > would suggest having it in the middle at say 11,725 MHz.  The switch
> > frequency is used by mythbackend to decide whether to tell the DVB-S2
> > card to switch on or off the 22 kHz tone that tells the LNB to switch
> > to the high LOF.
> > 
> > The full frequency range you will be able to receive from is 10,700
> > MHz - 12,750 MHz, so I hope that covers everything you want to receive
> > from your satellites.
> 
> ....
> 
> Hi Stephen,
> 
> Thanks for all these explanations !
> 
> I tried again with
> 
> LOF- =  		 9750 MHz
> LOF+ = 		10600 MHz
> LOF Switch = 	11725 Mhz
> 
> No signal for scanning!
> 
> And still the message "DVBChan[1](/dev/dvb/adapter0/frontend0): Your
> frequency setting (114000) is out of range. (min/max:925000/2175000)"
> 
> 
> But the LOF Switch (11725 Mhz) is not in the middle oh LOF- (9750 Mhz) and
> LOV + (10600 Mhz).
> 
> Did I understand you right ?
> 
> LOF Switch does'nt depend on LOF- and LOF+ but on the capabilty of the card
> ?
> 
> Iif so, the only problem I have seems to be the above error message about
> the frequency setting.
> 
> I have no splitting. My Optex antenna has 2 LNBs but acually I use only one.
> 
> Bye
> 
> Klaus

I tried again: mythtv-setup does not keep the LOF Switch setting I give it, it 
always keeps 1500 Mhz I gave it before.

And "DVBChan[1](/dev/dvb/adapter0/frontend0): Your frequency setting (114000) 
is out of range. (min/max:925000/2175000)"

Klaus