Unexplained packet loss on 6902

[xyz9630]

When using the TBS6902 with the standard BDA interface of AltDVB or DVB Dream, frequent packet loss occurs at specific frequencies.
This card is equipped with two tuners, but the same issue occurs with both.

Specifically, the reception frequency range is 12640–12700. Using a Japanese-made LNB with an LO of 11200, the IF frequency is 1440–1500.
No packet loss occurs when receiving frequencies outside this range.

Possible causes such as antenna damage, faulty coaxial cables, or external noise were considered, but checking these did not resolve the issue.
The PC used is running Windows 11, and toggling VBS/HVCI on/off or using older drivers made no difference.
Installing the board on a different PC also did not improve the situation.

Curiously, when receiving via the StreamReader interface, no packet loss occurs at all.
Moreover, after using StreamReaderEx (including other apps like CrazyScan) even once, no packet loss occurs with the standard BDA interface until the PC is restarted.

I suspect that using StreamReaderEx may send some command to the tuner, which triggers stable operation.

Is there anyone who can solve this puzzling issue?

Thank you.

*Additional Information
It has been determined that only the entry "HWControl=1" in the StreamReader.ini file is required to ensure stable operation.
No other entries are required.

*Additional Information 2
When BDAType in the ini file is set to WIN7, TV, or TBS, packet loss did not improve.
However, when starting with other settings (e.g., TT) or comment out, even switching to the above settings allowed reception without packet loss until the PC was restarted.

[crazycat]

what card version ? please show streamreader.log

[xyz9630]

I'm not certain if this indicates the version, but the card has "V21" written on it.
A four-digit number, likely indicating the manufacturing date, is written as 2411.

I’m attaching the StreamReader.log file.
The process involves launching the app, receiving the problematic frequency, switching to a frequency that works normally, returning to the problematic frequency, and then closing the app.
This process was performed three times, switching the HWControl value in the order of 0, 1, 0.
The app used is AltDVB.

[crazycat]

Please try test driver 1.0.0.7 (self-signed debug build)
https://sourceforge.net/projects/crazys ... r/download

[xyz9630]

Thank you for your prompt response.
I tried the driver you provided right away, but unfortunately, the packet loss issue persists.

It feels like the frequency of occurrences has decreased, but after a while, packet loss seems to happen all at once in bursts.
Since I’m currently busy and could only conduct a simple test, I’ll perform more detailed tests and attach logs in the near future. Please bear with me a little longer.

[xyz9630]

Thank you for your patience.
Attached is the log of the StreamReader when using the provided test driver.

I tested the operation with four types of BDAType in the ini file: WIN7, TV, TBS, and commented out (AUTO).
First, I launched the app with HWControl set to 0, then switched it to 1 and launched the app again, and finally set it back to 0 to verify the operation.
After that, I restarted the PC, switched the BDAType, and repeated the aforementioned steps.

The app used here is AltDVB 2.5.
Still the same, when BDAType is set to WIN7, TV, or TBS, packet loss occurs even with HWControl=1.
However, when BDAType is commented out, packet loss no longer occurs. After that, until the PC is restarted, no packet loss occurs even when HWControl is set to 0 or when using the Dev_BdaDriver included with AltDVB.