Frequently Asked Questions (FAQ) Regarding Prof Devices

Question 1.

 What is the process of «Virtual MPE Decoder Adapter»?

Answer:  «Virtual MPE Decoder Adapter» is being installed along with the IP DATA utility. Installer consists of two components: IP DATA utility and «Virtual MPE Decoder Adapter» driver. If you are installing the IP DATA for the first time you must install «MPE-adapter» (leave a tick in corresponding window when installing IP DATA). If you wish to upgrade IP DATA to the latest version, then it is not required to install «MPE-adapter», as it is already present in the system settings (you have to delete the tick when upgrading IP DATA).

Question 2.

 IP DATA does not work in OS Windows Vista .

Answer: there is an option of User Account Control(UAC) in Windows Vista that blocks the network driver access and traffic flow. UAC must be disabled to let the IP DATA operate.

Question 3.

 Do I have to change the MAC-address  in «Virtual MPE Decoder Adapter» settings when setting up  satellite Internet?

Answer:  For some hosting providers and accelerators it is required to specify the MAC-address(network address) in new  «Virtual MPE Decoder Adapter» versions.  And the other accelerators and providers, such as SlonAx, Globax this address in «Virtual MPE Decoder Adapter» settings is not required, since they operate with MAC-address set in the IP DATA that is always important as the main satellite internet traffic filter. If you recognize that MAC-address setting is required, you should proceed to: "Properties"=> "Set up"=> "Advanced settings".

Question 4.

 How  to change the PF DiSEqC-premise amplitude in Prof-7300?

Answer: It is allowed to adjust the DiSEqC-premise amplitude for Prof-7300 DVB-card. You can find an optimal amplitude value to make your DiSEqC-switch work steadily. To do that, it is required to modify the following variables in the Windows Registry:

7300_Lnb_Mode is the frontend mode. Possible values: 0 and 1. 

0  - allows to use the mode of amplitude 7300_Lnb_Tone_Amplitude control.
1 -   transfers the frontend to the digital mode. 7300_Lnb_Tone_Amplitude does not operate in this mode.

7300_Lnb_Tone_Amplitude - 7300_Lnb_Tone_Amplitude is the amplitude of 22 kHz. It can take values from 2 to 6. The less the value the bigger the amplitude.
Possible values of 7300_Lnb_Tone_Amplitude:
4 - gives an order amplitude of 200-300 mV.
3 - gives an order amplitude of 300-400 mV.
2 - gives an order amplituder of 600-700 mV.
Other values have no practical meaning.

Default values:
7300_Lnb_Mode = 0
7300_Lnb_Tone_Amplitude = 2

dwIsTSStream - is the TS stream double buffering mode. Possible values: 0 and 1. 

1 - starts double-buffering.
0 - stops double buffering.
It can help in the case of CPU overload.

Default values:
dwIsTSStream = 1

Variables in the registry should be tracked with regedit utility(search by keyword of 7300_Lnb_Tone_Amplitude). Parameters are located in the "DriverData" directory.

After changing variables values in the registry it is required to reload the driver or OS Windows.

Question 5.

I cannot catch DVB-S2-transponder although other DVB-S transponders can be locked from this satellite.

Answer: DVB-S2 format is exigent about the signal other than DVB-S. Therefore, other beam coverage areas should be used for satellite Internet or TV receiving in DVB-S2 format. Following example will illustrate that. 

Table of standard ETSI EN 302 307:

Pay attention to the desired ratio of Es/No (depending on modulation and FEC type).

We demonstrate this by the example of  STV S2 transponder (coverage area If you receive the "11595,V,29270,7/8 (DVB-S)"transponder excellently, for example, at the level of 5.5dB (completely correct) but there is no margin on the SNR, then you probably will not be able to lock the "11149,V,20000,3/4 (DVB-S2)"transponder, because a signal more than 2dB is required, ok, at least of 1.5dB (2dB is an antenna diameter increasing approximately in 1,7-2 times). Phase noises and LNB stability requirements grow up as well. Not any cheap LNB (converter) will suit for that. 

DVB-S2 requires a more serious signal power and stability margin

As for the lock, the lock criterion is different for different hardware.

Prof 7300 has several lock levels: 

1. The tuner managed to find a carrier wave.
2. The demodulator for carrier type identification. 

3. FEC determination possibility.
4. The Viterby-decoder to be able to recover the data.

We can consider that each point of these makes a lock. But the stream, even with errors, can only be taken in the fourth case. 

Prof 7300 will make the transponder lock in the fourth case only. 

Conclusion:  There should be enough power and stability of the signal in your area to receipt the DVB-S2 transponder. You must have a parabolic antenna of sufficient size, cable and LNB must be of high quality.

Question 6.

When setting up a satellite connection, the providers and TV channels signal in S2 format  cannot be locked. After I have turned the converter head a little bit, the signal became 82/82 but a disruption took place after a while, and then again everything continued working properly.

Answer: Considering this information from the user it becoming clear that there is unsufficient signal level and/or incorrect satellite dish/LNB setting takes place. Obviously the antenna orientation is "azimutal" (not"polar "). Maybe the user had turned the antenna but did not set up the converter. When the user turns the converter, the cross-polarizations are being removed.

As a quality indicator, Prof 7300 has SNR (the signal/noise ratio in dB). Accordingly, if the quality indicator is 82 then SNR is 8.2dB. If, for example, the user sets the S2 with FEC = 3/4 then for the given value, the desired FEC minimum level is 7.9dB. As you can see, there is no any reserve. And any noise or change of weather will result in inability to lock the signal.

Question 7.

What is the Prof 7300 signal level and what does its value determine

Answer: The signal level changing degree depends on many conditions, including, but not limited to: 

1. Gain of LNB and antenna.
2. LNB linearity .
3. Loss and interferences.

The strength of Prof-7300 signal is the level of AGC (Automatic Gain Control). Let’s say like this: if the level is 72% -82% it is likely that there is a certain signal caught in the tuner bandwidth. In different conditions it may vary within 20-90%. Prof-7300 may display the following signals at the Intelsat 904: 

Frequency, Level, Quality
11042, 74%, 100%
11152, 62%, 100%
11149, 81%, 100%
11526, 64%, 100%
11595, 80%, 100%

These are the signal levels at the one satellite but different transponders. 60% is, possible, quite  enough, and 80% is not always better than 60%. The difference may be that there is some  transponder interferences with 80%.

Question 8.

Mann software buffer overflows after 14 hours of work.

Answer: First, use the special Streamreader.dll. Secondly, for different providers use different buffer sizes. For PlanetSky and SatGate the "Module buffer=1000160" is to be used. If after 14 hours of Manna software work a buffer overflow is observed, then use "Module buffer=1000160x1.5". 

According to our testers, Streamreader.dll can work 23 days without dumping.

Question 9.

What  h.264/AVC and MPEG2 codecs can you suggest? 

Answer: The choice of MPEG2-codec is not so crucial, since much system resources is not required for MPEG2 video. If you plan to watch HDTV in h.264/AVC format then you should read the section "Setup of h.264 video hardware speed with the help of video-card".

MPEG2 and h.264/AVC decoders usually are the commercial products. They are purchased bundled with the basic software package. CyberLink PowerDVD package, for example, costs $45-50. 

For informal codec packs fans we recommend CLVD Pack (MPEG2-decoder) and HD Pack 2.2 (best h.264/AVC-decodecs).

Question 10.

Which TV players do you recommend?

Answer: We recommend AltDVB and DVBDream, the best programs for satellite TV, in our opinion. AltDVB and DVBDream are distributed as freeware and allow you to play video in h.264 format, as well. 

 AltDVB player, thanks to its simple interface is a very stable and  robust  program. For beginners, the main difficulty of work with AltDVB,  is the initial choice of codecs to use.

We use AltDVB for the drivers and new DVB-cards models testing . In fact, this is a professional program for those who prefer stability.


We can also recommend such commercial products as ProgDVB Pro and DVBViewer Pro.


Question 11.

How to remove from the system the existing drivers? And should I really do it? 

Answer:  It is recommended to remove the old driver before installation of a new one. This done by removing the driver file from the Windows directory. For example, windows/system32/drivers/Prof6200.sys or windows/system32/drivers/Prof7300.sys.


There were situations, in practice of PTG technical support, when user claimed that he/she have the latest drivers, but still something is not working. Then, it was clarified, that Windows had not updated the driver in fact. The old driver remained because the user had selected an option "Allow OS Windows to choose an appropriate driver".

Question 12.

What LNB/converter do you recommend? 

Answer: Invacom SNH-031. Comments superfluous.

Question 13.

I consider to buy PLL-LNB SMW professional converter, is it much better than usual one? 

Answer: SMW develops very good and professional converters, but we do not recommend you to use them for the following reasons: 

1. LNB is sold with no antanna irradiator. You have to buy it separately. To do this, it is required to know its directional pattern. 

2. PLL LNB has the same polarization. This means that polarizer is a must. 

3. PLL LNB from SMW is single ranged. 

They exceed ordinary converters by all the parameters, but not easy to use, like any professional equipment. Buying Invacom SNH-031would be much better, quite enough for the domestic purposes.

Question 14.

How it is able to avoid harmonization problems of equipment connected to DVB-card?

Answer: good cable, good connectors,  and  good converters are necessary. If, say the user has Cavel DG 113 cable ended with F113-55,  Invacom SNH-031 converter then he/she probably will not have any harmonization problems (throughout the whole frequency range,it is impossible to achieve the ideal SWR value = 1). And if it is RG6 cable with a cheap converter then the  harmonization problems of such a size will arise, that it will become obviously (it is conditioned by an absence of lock on certain frequencies).


Question 15.

How to set AltDVB remote control for Prof 6200/7300/7301/7500/8000? 

Answer: In AltDVB module, the possibility of remote control using as hotkeys emulator is included.  Remote control can be set up in the following way: " Main Menu"=>"Settings" =>"Input"=>"Keyboard". Then use the "HotKey2" column for "hot keys"determination. Having chosen the necessary action, press the corresponding button on the remote control. 


Question 16.

Whether it is dangerous to connect antenna cable to DVB-card “on the go”?

Answer: Yes, it is dangerous and prohibited by DVB-device operation rules.                                      In "DVB-card operation rules" at page, as the main rule is stated: « all the cables commutations(antenna and USB) should be made only when both at the computer (stationary PC/ laptop) and at USB card all the power is switched off». The complete power switch off means total network cable plugs (stationary PC/ laptop)  disconnection from the sockets.  Switching off the  laptop or stationary PC by the shutdown button is not enough.

Furthermore, in DVB-card Operation Rules it is indicated that USB-card connection/ disconnection must be carried out by card power supply  plugging/unplugging from the socket (not by USB-cable connection/disconnection with the power supplied).

DVB-device failure as a result of "Operating Rules" is not deemed as warranty case, and such a device is not subject to return and replacement, by the reason of DVB-card failure upon DVB-card Operation Rules violation

The main reason of LNB at DVB-card  power supply circuits failure is  the presence of voltage on the computer case which is connected to the network but not grounded. This is the reason that resulted in failure of most of  Prof cards which were sent to the   Prof Tuners Group failure analysis laboratory.


At the time of connecting the antenna cable to DVB-card, the voltage between the cable (by the hand holding a F-connector) and the card case may be enough to cause the failure of not only DVB-card but also the equipment connected to the antenna cable (converters, motors, switches,  etc.).


In addition, short-circuiting the antenna cable must be avoided. The probability of short circuiting the central cable conductor with the connector case when connecting on the go is much higher than the short circuit in the cable probability because of mechanical damage.

Question 17.

Why am I unable to lock some low-profile transponders such as Raduga 10957, V, 5000 c 90.0E transponder?


Answer: There exists such a phenomenon as "frequency drift".

Let's cite a Technical Maintenance specialist comment:

I noticed the increase of frequency of messages to  Technical Maintenance about problems with low-speed transponders locking by Prof cards. In particular there appeared questions regarding Raduga 10957, V,5000 from 90.0E transponder .

I decided to check the locking of this transponder to Prof-7301 myself. I turned the antenna to 90.0E, and tried to lock the transponder, but obtained no result, neither in  AltDVB 2.2, nor in IP DATA.

The reason for that is an inaccurate frequency. According to my observations, the lock took place when the frequency range from 10958 to 10961 was achieved. That's average value is 10959.5 MHz.

As you can see, the difference with 10957 is significant. How did it arose? The frequency of heterodynes in converter drifts. Although I have Invacom SNH-031 but the passport temperature frequency drift is up to ±3MHz. And in the case of cheap domestic converters you may face even the bigger frequency drift. Due to the fact that it is summer now, the range my be"as large as life". And even real carrier wave frequency of the satellite may be incorrect (possibly, in this case it was happened absolutely like that).


At the same time much attention is paid by the driver developers to the frequency line choice when a transponder is caught during locking (it is very important for the low-speed transponders because otherwise AFC can catch a wrong transponder).


In other words the lower transponder symbol rate the higher probability that to get a lock, client will have to scan the frequency higher/lower by 5, and track the result. And this is NOT CONDITIONED by Prof card. The claims should be addressed to that geniuses among the providers, who uses the low SRs for their transponders (even for the complex ones, DVB-S2 in Ku-band and C-band).