I am looking how to implement LNA support for the DVB API.
What we need to be configurable at least is: OFF, ON, AUTO.
There is LNAs that support variable gain and likely those will be sooner
or later. Actually I think there is already LNAs integrated to the
RF-tuner that offers adjustable gain. Also looking to NXP catalog and
you will see there is digital TV LNAs with adjustable gain.
Coming from that requirements are:
adjustable gain 0-xxx dB
LNA OFF
LNA ON
LNA AUTO
Setting LNA is easy but how to query capabilities of supported LNA
values? eg. this device has LNA which supports Gain=5dB, Gain=8dB, LNA auto?
LNA ON (bypass) could be replaced with Gain=0 and LNA ON with Gain>0,
Gain=-1 is for auto example.
regards
Antti
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http://palosaari.fi/
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