[DHU]

Priority: Medium
Server Information
Hardware: Albatron 865PE PRO V2 INtel, Pentium4 2.6, 1024Mb DDR, 230Gb SATA (ICH5R)
Graphic card and driver version: Geforce 5200 Ultra
Operating system: Windows XP SP2+Patches
Nebula Hardware: Low-profile PCI

Client Information
Hardware: As above
Operating system: As above
Nebula Hardware: As above


Description:
When I switch from German channel Phönix to Arte or EinsExtra to NDR,
then the screen stays black and there is no tone
The channels where it diffcult to switch to, need a longer tuning interval to get tuned in the first place

Expected behaviour:
It shows the program of the new channel with full picture and tone

Work-around:
Go to DigiTV->Files->Technical Information
and click on Discrete Frequency and change the frequency by 0.1 and back again then the program is shown correctly
Or change channel to some other channel an back again and depending on the actual neighbours the arte or NDR program is displayed correctly

[Bill]

DHU,


What is the signal strength , Snr and BER for these channels?

[DHU]

Everything is zero before changing the frequency and
after changing and back it is Strenght=78%, SNR=24dB, BER=0.0033

[DHU]

Possibly it has something to do with the vertical transmission compared to the other stations which are horizontical transmitted or a further difference is the error correction rate.

Here is some link to stations descripton unfortunately it is in German
[link]

[Bill]

[Ebab]

[Ebab]

[Bill]

[DHU]

The problem in Berlin is encountered at 191.5
for the stations arte, NDR, MDR and two further channel a MHP and a data channel.

If one changes the country setting only, then DigiTV will not tune to this stations, if coming from an adjusant channel with frequency 177.5 which it does normally with the German country setting, but it tunes the different channel irrespect of this country setting.

191.5 has also two data channel possibly they twist the tuning while switching and is not the vertical channel orientation or both

[murrayt]

DHU

One thought. In Australia we have available VHF and UHF channels much as you seem to have.

191.5 and 212.5Mhz are very close to the basic clock frequency of the PC at 200Mhz. It is quite possible that EMI arising from within the PC is swamping or at least affecting the signals coming into the sensitive antenna. I saw these effects a very long time ago but rectified it with new PC equipment

Maybe see if moving the card to a slot in the case that is further away from other cards.

Your PSU maybe one source of interference

Lastly keep the antenna lead as far away from the PSU power cable and any other cables to minimise pick up, and use a quad shielded fly lead to minimise interference.Equally make sure the PC case is closed as well

No guarantees but possibly a part of your problem

[DHU]

Hello,

I am not quite sure about what makes the difference, but I doubt it is the hardware as DigiTV 3.2 does not show this effect.
Following has an effect or is different:
* country settings
* Vertical vs horizontal alignment
* possibly data or MPH channels on the same frequency

Regards,

[knut]

This Problem has all Version >3.5.12b.
Nebula understand this since 1 year.

[DHU]

problem still got not fixed in 3.7.10,

it seems Nebula has to fix to many other problems