On Mon, Jun 20, 2011 at 11:10 PM, Antti Palosaari <crope@xxxxxx> wrote: > On 06/21/2011 12:04 AM, Markus Rechberger wrote: >> >> On Mon, Jun 20, 2011 at 10:55 PM, Rune Evjen<rune.evjen@xxxxxxxxx> wrote: >>> >>> 2011/6/20 Markus Rechberger<mrechberger@xxxxxxxxx>: >>>> >>>> to tell the difference the amplifier is for DVB-T2, DVB-C is disabled >>>> in windows because it's not reliable. >>>> Technically the chip supports it but the LNA decreases the quality. >>>> There are already some other PCI boards >>>> out there with that chip which do not use that LNA which should have a >>>> better performance with that Sony chip. >>> >>> Is it possible to work around this by disabling the lna or is the >>> quality decreased permanently as part of the hardware design, >>> independently of whether the lna is enabled or not ? >>> >>> I searched the linux-media list and it seems that an lna option was >>> discussed as a module parameter, but modinfo for the module I use [1] >>> (using the media_build git repository) doesn't show a lna parameter. >>> Can the lna be disabled in another way ? >>> >> >> no, otherwise it would be sold as full hybrid device. DVB-T2 is weak >> that's why it was added. >> Failing DVB-C would increase the device return rate, that's why it is >> sold as DVB-T2 only. > > How the others have resolved that problem? Is that signal strength only > issue when TDA18271 tuner is used? > USB is expected to be mobile, so sensitivity is a more important issue. The T2 tuner in question is designed to be a little bit mobile (you can use it with your notebook without moving at least). If you use a PC card you can play around with the antenna and won't move it all the time. The sensitivity optimization is quite clear why it's there for T2. C is clearly not the focus of that design. We already switched away from the tda18271 for our current (and especially upcoming) designs as well. Markus -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
