Digibox digital UHF versus analogue UHF
 

I'm assuming its the failing of digital systems compared to analogue.
But for the record cheapest and nasty Durabrand PSTB 1 freeview box for
multiplexed digital transmitted on UHF.
There is some normal loss of signal problems on a few channels leading to
partial loss of picture and/or sound or even total loss of content due to
,presumably, inadequate aerial, (occurs when the sun is in line with the
aerial but behind the Yaggi reflector end ).
But real query concerns on odd occassions for very strong digital channels
where there is never any partial loss there is sometimes cutting from normal
sound and vision to total loss, immediately, without any partial loss state,
maybe due to a few cycles of mains voltage dropping out. Only occurs perhaps
once a month so no problem really
The channel will stay off unless you reset by changing up and back down a
channel or switching off and back on.
But last week recording to VCR this happpened so no human intervention to
reset so 3/4 hour of perfect black video and silence until, via the internal
timer settings, it was changed to another channel and reset to that channel
and stayed perfectly with it to the end of that programme. Not a
transmission fault.
Is this intractable ? , ie the failing of digital systems over analogue
where some information gets through however degraded on sound or vision but
with digital, in this version anyway, it cannot recover of its own accord ,
or just a bug with this brand ?.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs
http://home.graffiti.net/diverse:graffiti.net/

Digibox digital UHF versus analogue UHF
 

With freeview on air you need to have a clean signal no ghosting and
not too weak and not too strong. You may find an attenuator may help to
stop the box locking up. I had a similar problem with a Pace unit which
was fixed by a 6db attenuator. The cable needs to be proper 75ohm
Lowloss as well. If your using old cable its worth changing.

http://www.sunseekerit.co.uk

Digibox digital UHF versus analogue UHF
 

skyclad wrote in message
ups.com...
With freeview on air you need to have a clean signal no ghosting and
not too weak and not too strong. You may find an attenuator may help to
stop the box locking up. I had a similar problem with a Pace unit which
was fixed by a 6db attenuator. The cable needs to be proper 75ohm
Lowloss as well. If your using old cable its worth changing.

http://www.sunseekerit.co.uk


So you've seen exactly this latch up to zero sound and vision on a different
make ?
With this one it coincided with the same week removing a mains powered
aerial booster that was still there for getting a viewable but not perfect
weekest analogue UHF signal ( the digital version is now perfect) , the
partial dropouts on the week digital channels became much improved but it
would seem the strong digital channels could become prone to this total
dropout problem.

Digibox digital UHF versus analogue UHF
 

"N Cook" wrote in message
...
skyclad wrote in message
ups.com...
With freeview on air you need to have a clean signal no ghosting and
not too weak and not too strong. You may find an attenuator may help to
stop the box locking up. I had a similar problem with a Pace unit which
was fixed by a 6db attenuator. The cable needs to be proper 75ohm
Lowloss as well. If your using old cable its worth changing.

http://www.sunseekerit.co.uk


So you've seen exactly this latch up to zero sound and vision on a
different
make ?
With this one it coincided with the same week removing a mains powered
aerial booster that was still there for getting a viewable but not perfect
weekest analogue UHF signal ( the digital version is now perfect) , the
partial dropouts on the week digital channels became much improved but it
would seem the strong digital channels could become prone to this total
dropout problem.

Several digital TV channels are transmitted on one digital multiplex so
whatever effects the multiplex usually effects all the channels on that
multiplex. How many transmitters are within range of southampton? Is it
possible that the weak channels are actually coming from a multiplex on the
"wrong" transmitter? If so try looking for a better version of the same TV
channels coming from the right transmitter..

Enter post code here to get details of the transmitters you might be seeing.

http://www.dtg.org.uk/retailer/coverage.html

Digibox digital UHF versus analogue UHF
 

I meant to say get your aerial checked first.

We just moved into a rented house and the aerial on the roof is designed to
pickup the lower part of the TV band. That gives great analog TV recieption
but all the digital multiplexes are in the upper part of the band - so no
digital TV at all until the aerial is changed to a wide band aerial.