17 replies to this topic

[iko]

I have Vuplus duo2 - Twin tuner DVB-S2 (OpenPli ver. 4) and don't work channels on Belintersat 1 (51,5°E), frek. 11290 MHz, pol. H, SR: 45000, FEC: 5/6, DVB-S2/8PSK. 

[littlesat]

Hopefully this txp does not a have too wide bitrate for your box....

[Huevos]

That transponder is listed as 3/4.

[iko]

I tested on pc (TBS card) and everything worked. Duo2 does not work. 0 channels

[Huevos]

Not locking on high SR is a known problem on the dual DVB-S2 tuner card. I have the same problem with 27W.

[iko]

I connected the TBS card 5925 to the duo2 and the same problem. BBC on 27W is ok.

[amila4341]

Is it hardware problem or driver problem. Because some tp with dvb s2 8psk is tuned in 88e but some don't.

[amila4341]

As per avilink AVL 6211 data sheet it should be possible to tune 8psk high symbol rates up to 45000

Description
DVB-S2/DVB-S Channel Receiver Data Sheet
The AVL6211 is an enhanced version of the AVL2108 device. The AVL6211 is a highly integrated DVB-S2 and DVB-S channel receiver IC. It converts a baseband analog IQ signal from a satellite tuner and performs
Applications
• Digital satellite receiver for standard and high definition TV
• High speed satellite data receiver
Features
Confidential for Honestar a set of sophisticated demodulating and
decoding operations to output an MPEG video/audio stream. The AVL6211 provides simple and flexible control via a standard two-wire bus. A simplified block diagram of the device is shown in Figure 1-1.
The AVL6211 includes dual, differential, high performance, analog to digital converters (ADC) with a built-in compensation circuit for DC offset and IQ imbalance. An RF AGC output is provided for simple gain control of the satellite tuner via an RC network.
After passing a timing recovery loop and frequency recovery loop, the signal samples are further processed by an equalizer to output decision bits to an FEC decoder. The decoded bits are finally packetized in the MPEG interface block.
The configuration of the AVL6211 is easily performed through a set of registers via a standard two-wire bus. To simplify the interface to the host system, this same two- wire bus is used to communicate with the separate tuner two-wire bus and the DiSEqC™ interface to the LNB.
The AVL6211 can achieve fast acquisition at frequency offsets up to 5 MHz and maintains synchronization under the most severe front- end phase noise.
**Refer to Table 7-1
• High performance QPSK/8PSK satellite TV receiver
• 64 pin LQFP in 7x7 mm package
• Low 250 - 270 mW power (clear sky)**
• Low 330 - 460 mW power (threshold)**
• DVB-S2:
• Data Rate: QPSK 1-55 Msps
• Data Rate: 8PSK 1-45 Msps
• Code Rates: 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9 and 9/10
• Roll-off factors for pulse shaping: 0.2, 0.25 and 0.35
• DVB-S:
• Data Rate: 1-55 Msps
• Code Rates: 1/2, 2/3, 3/4, 5/6, 7/8
• Directly interfaces with tuner for easy implementation
• Integrated dual A/D converters
• Fast automatic blind scan of symbol rates and carrier frequencies
• Carrier frequency acquisition range: ±5MHz for symbol rates above 3 Msps and ±3MHz for the remaining symbol rates
• Signal quality and BER/PER monitors
• Equalizer compensates for channel impairment
• Standard two-wire serial bus with two selectable addresses for easy chip configuration
• Multi-purpose modulator for DiSEqC™ applications
• Standard MPEG-2 transport output parallel and serial interfaces
• Software controlled tri-state MPEG and RFAGC outputs
• Software controlled LNB interface (GPIOs)

[amila4341]

Any solution please

[Erik Slagter]

You expect us to bring a solution to a slightly broken tuner?

[amila4341]

You expect us to bring a solution to a slightly broken tuner?

Sorry I don't get what you are telling. Are you of the view that my tuner is faulty or all duo2 tuner's have inherent fault that cannot be fixed.

[littlesat]

It might also be you LNB is not allowing a 45000 MSps bandwith as output...due to the LNB output filter is too small.....  

Edited by littlesat, 8 July 2017 - 11:29.

[Matrix10]

LNB, It's not the problem.

The same LNB receives the channels on other VU + receivers.

 

It is not even certain that the SR is a only problem

Because it receives some other channels with a high SR.

 

It looks more like a combination of factors.

 

VU + is at the height of the problem.

Hopefully solution.

Edited by Matrix10, 8 July 2017 - 11:45.

[amila4341]

It might also be you LNB is not allowing a 45000 MSps bandwith as output...due to the LNB output filter is too small.....

It is not issue with lnb not being able to scan 45000 symbol rate. Some transponder with the same symbol rate works some don't.

Edited by amila4341, 8 July 2017 - 11:57.

[Huevos]

 

You expect us to bring a solution to a slightly broken tuner?

Sorry I don't get what you are telling. Are you of the view that my tuner is faulty or all duo2 tuner's have inherent fault that cannot be fixed.

 

No, not faulty. Tuner is specified up to 45000 SR. You are trying to receive 45000 SR. That is right on the limit of this tuner's capability. If this transponder is 8PSK it will be double difficult for the tuner.

Edited by Huevos, 8 July 2017 - 17:54.

[amila4341]

You expect us to bring a solution to a slightly broken tuner?

Sorry I don't get what you are telling. Are you of the view that my tuner is faulty or all duo2 tuner's have inherent fault that cannot be fixed.

No, not faulty. Tuner is specified up to 45000 SR. You are trying to receive 45000 SR. That is right on the limit of this tuner's capability. If this transponder is 8PSK it will be double difficult for the tuner.

How could it tuning some transponder with symbol rate of 45000 8psk and other with same modulation, symbol rate not tuning

Edited by amila4341, 9 July 2017 - 06:00.

[Erik Slagter]

Apparently it can. It can depend on so many factors, we don't know about, it's all inside the tuner. It's exactly how Huevos tells it, if you're pushing the tuner to the limit, it's behaviour may start to be unpredictable.

 

BTW, I don't think transponders meant for CONSUMERS are driven this way to the limits, so I am suspecting some not completely legal business here...

[amila4341]

Apparently it can. It can depend on so many factors, we don't know about, it's all inside the tuner. It's exactly how Huevos tells it, if you're pushing the tuner to the limit, it's behaviour may start to be unpredictable.

BTW, I don't think transponders meant for CONSUMERS are driven this way to the limits, so I am suspecting some not completely legal business here...

However it exists
Check transponder of below
http://www.flysat.com/st2.php