Use with caution, the result highly depends on the
accuracy of the clocksource your machine uses.
On some machines it may be quite accurate, on
others completely off.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
Otherwise the tuner would use the uncorrected xtal value
after enabling and disabling the direct sampling mode
Signed-off-by: Steve Markgraf <steve@steve-m.de>
We now use Hz instead of KHz for calculating the PLL
parameters, and use the actual crystal frequency in Hz,
which allows to correct the frequency error in ppm.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This allows tuning to 27 MHz for example (civil band).
Best results are achieved when setting the gain to
very low values.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This fixes the issue of the FC0013 locking up at frequencies
between 928.0 and 950.0 MHz, which happened because
the numerator of the fraction exceeded its 5 bit limit.
For the tuner to behave normally again, the dongle needed
to be replugged.
For the FC0013 this now results in a small gap between
948.6 MHz and 950.0 MHz, where no valid PLL values
are existant.
For the FC0012 tuning is aborted when the maximum
frequency has been reached (948.6 MHz).
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit adds the function rtlsdr_set_direct_sampling()
which can be used to enable/disable a mode where the
RTL2832 acts as a direct sampling receiver.
This mode disables the tuner, and by attaching a long
wire, or better, a 50Ω to 200Ω transformer and a lowpass-
filter to the In-phase ADC input (pin 1 or 2 of the RTL2832,
whereas pin 1 is at the molded dot) it is possible to listen to
shortwave radio stations. The coupling capacitors can be
left in place, but for better results they should be removed.
Tuning in this mode is done with the DDC, and since the
ADC samples with 28.8 MHz, tuning is possible from 0 to
28.8 MHz.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This takes simply too much time (almost 3 seconds)
and doesn't really seem to make any difference for our
use case.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
This could lead to a misdetection of the tuner on some
platforms (E4K instead of FC0013 on the raspberry pi).
Thanks to Christoph Gommel for reporting this issue.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
Steve Markgraf
Kyle Keen
Hoernchen
Dimitri Stolnikov