"John Legon" wrote in message
o.uk...

"Roger R" wrote in message
...

"John Legon" wrote
Roger R wrote
What do you make of the channel at 10744 H that comes up as Test-R ?

Now and Next information is ' Dynamische Programmunschalt' - some kind
of
dynamic program selection, but how or what ?
Each time I select that channel I get either arte or Phoenix apparently
at
random.

Phoenix @ 10744 Video Pid 501
arte @ 10744 Video PId 401
Test-R @ 10744 Video Pid listed as 401 or 501 dependente
on
arte or Phoenix showing.

I think it's a test of the programme mapping table which (in theory)
can be used to dynamically change the PIDs that a service is using.
If a receiver continuously monitors the PMT for changes, then it will
automatically switch (in the present case) between arte and Phoenix at
the appropriate time. But if a receiver only consults the PMT when it
first tunes to a channel, then it will continue to use the PIDs (for
either arte or Phoenix) regardless of subsequent changes in the PMT.


In that case my Comag SL65 is constantly monitoring the PMT because it
switches the displayed channel intermittently when left unattended on
Test-R

I'll check out my other receivers to see if they also change the
displayed channel at the remote command.

I've just checked my two FTA boxes and they both make the switch at
intervals of one minute. Presumably they must respond to PMT changes to
be
DVB-S compliant, but there may be boxes that don't, and manufacturers can
obviously use Test-R for receiver testing.


I checked these receivers:
Panasonic Freesat HD TV
Humax Foxsat-HD
Silvercrest Comag SL65 - model with Ali E1 chip (later model)
Silvercrest Comag SL65 - model with STi 5518 chip (earlier model)

With the following results:
The Panasonic and the later SL65 changed in synchronism, and I conclude
these
were responding immediately to changes of the transmitted PID's.

With respect to the immediate changes on the above receivers:
The Humax changes immediately from arte to Phoenix, but delays changing
back from Phoenix to arte by around 10 seconds. Checked last evening and
again this morning.

An earlier model SL65 delayed the change in each direction by about 15
seconds with up to + or - 5 sec variability.

It would appear from these results that the Humax Foxsat-HD still has some
way to go shape up to this test, with the proviso that I have tried this
with only one box. On the basis of the switching delay is it possible to
claim the box is not DVB-S compliant ?