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Hi, i'm using latest DVBViewer pro version (no beta) and Technotrend TVStick usb2 ....it's all ok but sometimes i get some glitches while watching any channell.


What can i do?


I have windows xp sp2 (but the same problem on vista), latest bda drivers, cyberlink 7 or intervideo codecs, on a hp notebook with intel centrino 1.7ghz, 1gb ram and ati radeon mobility x600

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So what is your signal level? You can check that by clicking into the status bar (where 'Time' is displayed) until the signal status (in %, colored green) shows up. Think all TT products report pretty accurate levels..

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Think you are watching the timeline rather than the signal status. What color does the signal indicator have? In case of 80% it must be green.

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There are two possible reasons for discontinuities:


1) Bad signal quality (which doesn't necessarily mean bad signal strength!). Try to use a better antenna / cable, or search a better place for your indoor antenna.


2) Something in your PC interferes with the device or driver and causes loss of data. Hard to pinpoint...

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BTW, is there a reason why DVBViewer does not show signal strength in dB also, and also a % signal quality indicator? AFAIK the interfaces exist for BDA. Is there a lack of support from manufactureres not feeding them with information? Would be easier to pinpoint signal problems then...

Edited by CiNcH
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Think you are watching the timeline rather than the signal status. What color does the signal indicator have? In case of 80% it must be green.


yes you're right, the signal is near 45% and it's green, what's the minimum for no discontinuities?

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BDA signal strength can be meaningless because every manufacturer handles it a different way (it is very rare to find a BDA DVB-t device which actually maps the dB strength to a percentage - Pinnacle are one exception to this rule). Even taking different products from the same manufacturer (e.g. Hauppauge), they report strength in different ways because the driver source comes with several different companies. Signal strength as reported by BDA drivers is usually basically the AGC gain level, but again it is very rare to see this mapped to the actual AGC range. In an ideal situation, the lowest AGC would be 100% and the highest AGC would be 0% and then each value in between spread out accordingly.


For example, a Nova-t-500 will report a strength of 54. The Nova-t PCI with the same signal will report say -33000. The HVR-900 may report the same signal as 25632. In all cases it is not a percentage because it is not on a scale of 0-100. DVBViewer can be a bit misleading now, because it will show the Nova-t-500 as having 54% strength, the Nova-t PCI as 0% strength and HVR-900 as 100% strength. Yet this is with the exactly the same signal. "Ah but the tuners are less sensitive" you might say, but again that is false, because they are not a percentage, and DVBViewer displays them as a percentage with no knowledge of the min/max values. Only the card makers know the min/max and convert it to a percentage IN THE DRIVER.


You really need to check signal quality, which should be >90% and ideally 100% but I don't think DVBViewer provides a way to check that. There is a free tool called ScanChannelsBDA which will let you check that.

Edited by CX23882-19
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Thought signal indicators were pretty well covered and standardized by BDA: IBDA_SignalStatistics Interface



The get_SignalLocked method retrieves a Boolean value indicating whether the signal is locked.



The get_SignalQuality method retrieves a value from 1 to 100 indicating the quality of the signal.



The get_SignalStrength method retrieves a value that indicates the strength of the signal in decibels.

Edited by CiNcH
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Oh come on. every driver/manufacturer has it's own standard there. They are covered yes, but one gives values between -20000 and-9000 one between 100 and 200 one between 100 and 0. It is as standarized as the CI and DiseqC handling. :rolleyes:


You have no idea how long it took to figure this stuff out.


There are precautions so the values can't go over 100 or below zero.


So you want to compare? let's compare. climb up to your SAT dish and turn it a little then you can compare the value before with the value after. That is the only valid comparismen you can do. Everything else is bogus.

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@ B1G,


try TT-Media Center. It also has a quality level indicator. A completely new TT software (TT-STB), which is not yet released, will also show SNR and error rate...

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