Question Can anyone diagnose a fix to the 8PSK HD problem on my Manhattan Plaza HDR-S?

Manhattan Mike

Novice Member
Hi,

As per title. My box has never been able to cope with 8PSK HD signals, QPSK HD is fine but alas only Channel 5 uses that now.

The problem is heat sensitive in that if the temp is very warm or hot it's okay but anything less and the signal is broken up due to drop outs which get worse the cooler the box. This is presumably a hardware fault if so can anyone point to which component might be at fault?

The signal strength is fine and doesn't change during the drop outs

(why have a thought about this again now? - FTA prem football on Pick!)
 

Clem_Dye

Distinguished Member
It’s an odd fault. I’d start with the LNB/dish alignment and work from there. In my experience, thermal faults behave the other way to what you describe. Can you try another box to see what happens?

Clem
 

Manhattan Mike

Novice Member
I agree it's an odd one! No I don't have any other box I can try.
Not sure how LNB/disk tweak will help, esp as it's always done this and I've had reason to move and reset dish more than once in recent years. Can you give me the technical reason it might work?
 

Clem_Dye

Distinguished Member
It's the thermal thing that seems wrong to me. In my experience with a lot of kit, a lot of it IT-related, problems started occurring once equipment got hot. Yours seems to be the other way round. When diagnosing faults, you need to start somewhere, so your options are either the dish/LNB, cabling (unlikely, I think) or the receiver. One of these needs to be checked/changed in order to try and track down the problem. The easiest is probably the receiver -- a new Arris unit (although that could bring its own set of problems) or an FTA box.

Clem
 

Manhattan Mike

Novice Member
Not going near that Arris box! I'll wait until it's ready for use :D

Terrible name by the way - aris/arris being slang for arse which seems to sum up that box for now.
 

Clem_Dye

Distinguished Member
Could you borrow something just so see what happens? I agree with the Arris name though — not my first choice, for sure!

Clem
 

TJT1

Member
Arris is rhyming slang for Harris Tweed = swede = head.
 

grahamlthompson

Distinguished Member
Hi,

As per title. My box has never been able to cope with 8PSK HD signals, QPSK HD is fine but alas only Channel 5 uses that now.

The problem is heat sensitive in that if the temp is very warm or hot it's okay but anything less and the signal is broken up due to drop outs which get worse the cooler the box. This is presumably a hardware fault if so can anyone point to which component might be at fault?

The signal strength is fine and doesn't change during the drop outs

(why have a thought about this again now? - FTA prem football on Pick!)

Can you explain more. Is the issue that you cannot view Pick-HD ? Or Are you trying to add the Pick-HD in non freesat mode.

If the former the box needs a software update. This channel is on both the original G1-Freesat Humax boxes (Foxsat-HDR) and the 2nd generation Humax G2 boxes.

If you cannot view it the box isn't fit for purpose. This channel is now on the Freesat epg.

So you have a certified Freesat+ box that cannot view a genuine Freesat channel.

A complaint to Freesat who have certified the box seem like the next thing to do.
 

pedro2000uk

Distinguished Member
Hi,

As per title. My box has never been able to cope with 8PSK HD signals, QPSK HD is fine but alas only Channel 5 uses that now.
Do you mean DVB-S2 8PSK 3/4 FEC.. ?

Are the following OK

Cnn HD
Smithsonuan HD
Quest HD
RT news HD

They all use different combinations & fecs

It is an odd fault- sounds like a faulty component
 

Manhattan Mike

Novice Member

re grahamlthompson
Pick HD is on 147 so I obviously have it. That's fine.

----------------------------------

As for which particular variety of HD signal is the problem - it's all 8PSK signals. Trust me I've watched every HD channel on the EPG and only Channel 5 is as it should be.

I'm pretty sure I was able to watch Smithsonian HD when it was in FTA test mode -

KingofSat give it as originally 10896 V 27000 3/4 before changing to the current
11508.50 V 23000 2/3.

Could that change in SR, FEC be the difference as far as my box is concerned?
 

pedro2000uk

Distinguished Member

re grahamlthompson

Pick HD is on 147 so I obviously have it. That's fine.

----------------------------------

As for which particular variety of HD signal is the problem - it's all 8PSK signals. Trust me I've watched every HD channel on the EPG and only Channel 5 is as it should be.

I'm pretty sure I was able to watch Smithsonian HD when it was in FTA test mode -

KingofSat give it as originally 10896 V 27000 3/4 before changing to the current
11508.50 V 23000 2/3.

Could that change in SR, FEC be the difference as far as my box is concerned?
Definitely, more error correction (FEC) usually reduces such issues on tuners/ stbs &/or lnbs or even alignment issues. Less error correction can cause issues to some.

It's a trade off / balancing act broadcasters are faced with, the lower the error correction the less bandwidth they have to pay for but that can reduce the number that can receive it.

The same goes for using DVB-S2 with 8PSK - It was intended to be much more efficient but it had similar reception issues so they had to sort of go back to the drawing board using a variety of combinations of dvbs dvbs2 qpsk 8psk & a wide range of fecs to arrive at the best bandwidth / reception balance, but tuners lnbs stbs and broadcast equipment all are improving & the mini dish was also increased from 45cm to 50.

DVBS / 8PSK (edit & dvb-s2 / qpsk) are more wasteful on bandwidth initially but much more robust than DVB-S2 8PSK & allows for much lower FEC.
 
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