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I know this has probably been answered many times over the years but getting confused looking at different threads.
I currently have single cable to the lnb, configured with the link cable from LNB1 out to LNB2 in. This is great I can use multi-channels.
However, I want to now take LNB1 out to my tv. I understand all the limitations but the Foxsat and the tv will have separate uses and will almost never both be on at the same time.
I just want to check, the foxsat has the option for single cable without the loop-through? I’m assuming this can only be done with a factory reset and don’t want to go through all that if it cannot be done. (I’ve read posts that suggest, if you are single cable, it assumes there will be a loop through?)
For reference when using the link cable, the hidden menu tells me I have “connection type: one cable” and the option is disabled. ( I have a motorised setup if that complicates anything)
The software assumes that the link cable is present. So it will let you make impossible dual recording reservations. If you fit a splitter to the link cable use one output to feed tuner 2 and the the other the TV.
The box should continue to work as it does now.
Firstly ensure the box has low power standby enabled.
What channels you can view on the TV depends on what transponder tuner 1 is using.
With the box in full sby all channels on the TV can be used.
With the box fully on, or about to record, the TV can only use channels that are in the same frequency band high/low (there are very few high band channels on the freesat epg), and having the same polarisation horizontal/vertical as the transponder tuner 1 is using.
This information can be downloaded from the info and links in this thread,
https://myhumax.org/forum/topic/what-can-i-record-and-watch-using-1-or-2-cables
Thanks for the reply. Good to know I didn’t waste my time trying a factory reset.
Really interesting suggestion with the splitter. I hadn’t even considered that would work and indeed it would have been a perfect solution. I even have a two way splitter the cable company left when it was replaced with a three way. I just tried it. Unfortunately I only get signal on the tv when the Humax is on even with the power saving enabled. (no clock on display in standby) I don’t know if it something to do with having a motorized dish or maybe something to do with this: https://myhumax.org/forum/topic/no-or-bad-signal-after-standby
AlanFoxsat – 42 mins ago »
Thanks for the reply. Good to know I didn’t waste my time trying a factory reset.
Really interesting suggestion with the splitter. I hadn’t even considered that would work and indeed it would have been a perfect solution. I even have a two way splitter the cable company left when it was replaced with a three way. I just tried it. Unfortunately I only get signal on the tv when the Humax is on even with the power saving enabled. (no clock on display in standby) I don’t know if it something to do with having a motorized dish or maybe something to do with this: https://myhumax.org/forum/topic/no-or-bad-signal-after-standby
I have a TV connected to my Foxsat using Tuner 1 out but it has two cables to a fixed dish on 28.2E. So the Diseqc settings may affect this.
The cable splitter may be the wrong frequency range. You need one suitable for Sat if frequencies. Try the TV with a straight cable from tuner 1 out.
Splitter says 5-1218 MHz so don’t know if that should be suitable, given that it works but only when the Humax is turned on.
tuner 1 out to tv worked, which is what led me to ask the original question of whether I could tell the Humax to not expect the link cable and block channels accordingly, that I was kindly told is not possible. Although thinking about it now, I can’t actually remember if I tried turning the Humax to low power standby. Might have to try again.
P.S. I assume there is no risk of damage from conflicting voltages/signals, testing all this ???? Obviously turning off when messing with cables.
AlanFoxsat – 1 hour ago »
Splitter says 5-1218 MHz so don’t know if that should be suitable, given that it works but only when the Humax is turned on.
tuner 1 out to tv worked, which is what led me to ask the original question of whether I could tell the Humax to not expect the link cable and block channels accordingly, that I was kindly told is not possible. Although thinking about it now, I can’t actually remember if I tried turning the Humax to low power standby. Might have to try again.
P.S. I assume there is no risk of damage from conflicting voltages/signals, testing all this ???? Obviously turning off when messing with cables.
Without low power sby on it will not work. There is no risk because only tuner 1 has lnb control when the box is on or recording. The TV and tuner 2 have no control so no voltage output needed. When in sby the tuner 1 in is directly connected to tuner 1 out. Use a splitter that blocks dc in on the output connected to the TV. That way only tuner 1 or tuner 2 can provide DC power for the lnb at 12/18V depending on polarisation.
All the band and polarisation switching are dow
Ah I see now. The cable splitter does not have DC pass through that is needed for the lnb to work and presumably those that have it, only allow it in the one direction to prevent conflicting DC power. Not sure if your post was truncated or DOW means something but I get the idea. Thanks.
AlanFoxsat – 1 min ago »
Ah I see now. The cable splitter does not have DC pass through that is needed for the lnb to work and presumably those that have it, only allow it in the one direction to prevent conflicting DC power. Not sure if your post was truncated or DOW means something but I get the idea. Thanks.
Should have said down to tuner 1.
You need a splitter that passes DC from the tuner 2 cable and not the TV.
Current pass direction isn’t shown
Connect tuner 1 out to in/out. Connect TV to TV and Sat to tuner 2 in. a Test meter with a battery should be able to confirm the splitter blocks DC positive in the direction you need.
You might have to build your own DC blocker. A silicon diode soldered into the coax core the right way round should do this basically you need to block DC out from the TV tuner getting to the splitter.
Quote:A silicon diode soldered into the coax core the right way round should do thisWill that actually work in practice? A silicon diode needs 0.6V forward bias to switch it on.
When I wanted to reverse the DC direction in a splitter (to make a combiner) I had to reverse the diode within the splitter. The RF bypassed the diode by means of the RF chokes and capacitors.
Trev – 3 mins ago »
Quote:A silicon diode soldered into the coax core the right way round should do thisWill that actually work in practice? A silicon diode needs 0.6V forward bias to switch it on.
When I wanted to reverse the DC direction in a splitter (to make a combiner) I had to reverse the diode within the splitter. The RF bypassed the diode by means of the RF chokes and capacitors.
It needs to be reverse biased
The voltage will be 12V or 18V. All it needs to do is not pass any current. Just to make sure the TV satellite tuner has no way of interfering with tuner 2 when it has lnb control
grahamlthompson – 4 hours ago »
AlanFoxsat – 1 min ago »
Ah I see now. The cable splitter does not have DC pass through that is needed for the lnb to work and presumably those that have it, only allow it in the one direction to prevent conflicting DC power. Not sure if your post was truncated or DOW means something but I get the idea. Thanks.
Should have said down to tuner 1.
You need a splitter that passes DC from the tuner 2 cable and not the TV.
Current pass direction isn’t shown
Connect tuner 1 out to in/out. Connect TV to TV and Sat to tuner 2 in. a Test meter with a battery should be able to confirm the splitter blocks DC positive in the direction you need.
You might have to build your own DC blocker. A silicon diode soldered into the coax core the right way round should do this basically you need to block DC out from the TV tuner getting to the splitter.
The link has two options. The combiner appears to be for combining/splitting satellite and aerial RF but the splitter option has arrows showing DC pass on both OUT ports with arrows which would seem to show that power can only pass in the direction indicated?
AlanFoxsat – 13 mins ago »
grahamlthompson – 4 hours ago »
AlanFoxsat – 1 min ago »
Ah I see now. The cable splitter does not have DC pass through that is needed for the lnb to work and presumably those that have it, only allow it in the one direction to prevent conflicting DC power. Not sure if your post was truncated or DOW means something but I get the idea. Thanks.
Should have said down to tuner 1.
You need a splitter that passes DC from the tuner 2 cable and not the TV.
Current pass direction isn’t shown
Connect tuner 1 out to in/out. Connect TV to TV and Sat to tuner 2 in. a Test meter with a battery should be able to confirm the splitter blocks DC positive in the direction you need.
You might have to build your own DC blocker. A silicon diode soldered into the coax core the right way round should do this basically you need to block DC out from the TV tuner getting to the splitter.
The link has two options. The combiner appears to be for combining/splitting satellite and aerial RF but the splitter option has arrows showing DC pass on both OUT ports with arrows which would seem to show that power can only pass in the direction indicated?
Which is why you may need to make an external DC blocking add on by adding a silicon diode,
You need a unique solution.
A reverse biased silicon diode stops any current passing. A bridge connection converts AC to DC.
https://www.instructables.com/id/Make-A-Bridge-Rectifier-From-Diodes/
A single one blocks all DC current in one direction. That’s what you need for the Tv Connection/
A straight forward diode in the signal path, (unless bypassed with a capacitor) will not pass signal level AC unless it is forward biased on by approx 0.6V between anode and cathode. Surely his rather defeats the objective. You Need the signal level AC through but block the DC from the unwanted source.
A combination of the splitter and a diode to block DC in the opposite direction will block both signals and DC current both ways.
Trev – 4 hours ago »
A straight forward diode in the signal path, (unless bypassed with a capacitor) will not pass signal level AC unless it is forward biased on by approx 0.6V between anode and cathode. Surely his rather defeats the objective. You Need the signal level AC through but block the DC from the unwanted source.
A combination of the splitter and a diode to block DC in the opposite direction will block both signals and DC current both ways.
An isolated wall outlet plate in the lead to the TV will block DC and pass the rf.
I have seen several references that these splitters do indeed have diodes to protect the DC going the wrong way. Looking at the reviews, lots of people seem to be using them and I have not seen any reports of damaged equipment. (just the expected complaints from people who don’t understand the channel limitation)
Based on this, is their any benefit of using the splitter (as suggested) connected to lnb1 out, rather than before the humax. i.e. one output to the humax (still using the link through cable), the other to the tv ? It would appear this is the way most people are doing it, connecting to two devices that don’t have an out socket?
Incidentally, just to check, whilst I don’t have a splitter, If I just connect the tv to lnb1 out, accepting that some offered channels will not work, there is no danger of damage from this? Also, I seem to remember that a single scheduled recording could not be guaranteed to use either of the tuners so could potentially fail?
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