Re: [PATCH 0/3] cxd2820r: tweak search algorithm, enable LNA in DVB-T mode

[Gianluca Gennari <gennarone@gmail.com>]

Il 15/03/2012 18:41, Mauro Carvalho Chehab ha scritto:

> 
> Hi Gianluca,
> 
> With regards to LNA, the better is to add a DVBv5 property for it.
> 
> The LNA is generally located at the antenna, and not at the device.
> 
> As you know, more than one device may be connected to the same antenna, 
> and it is generally not a good idea to have two devices sending power to
> the LNA.
> 
> So, it is better to have a way to turn it on via the usespace API.
> 
> Also, as this consumes power, the better is to do it only when the device
> is actually used.
> 
> Regards,
> Mauro

Hi Mauro, I believe this "LNA" is just an internal amplifier that is
embedded in the cxd2820r demodulator itself.
I have a "condo" antenna so there is no way I can control the power from
my apartment as everything is centralized.

Many DTT receivers have a "5v power" option to drive the antenna
amplifiers on the roof. But almost every antenna (at least here in
Italy) has a dedicated power supply, in order to make things simpler for
the user.
Anyway, a DVBv5 property to control this "power switch" is a good idea.

Regards,
Gianluca