* rtlsdr_set_tuner_sideband():
- "HF-Hase" Bernhard Kistinger (DB9PP) found out,
that one of the undocumented I2C register bits of R820T tuner
controls the used tuner/mixer lower or supper sideband.
That was by testing/playing with a special QIRX version,
showing and allowing change of all I2C registers.
- previous additions in rtl_tcp allowed control of I2C registers;
in addition register contents can be transmitted periodically (to QIRX)
- "Oldenburger" developed a first version controlling the sideband bit,
and additional spectral flipping (spectrum inversion) in the RTL2832
- i've merged Oldenburger's changes with my rtlsdr_set_tuner_band_center()
=> altogether, there's no spectrum inversion, the band center stays,
just the IF filters (steep lowpass and not-so-steep highpass) switch positions
* Oldenburger's changes for FC0012 tuner
* Oldenburger added description of R820T's I2C registers
* rtl_tcp's new response channel now occupies an additional port,
usally 1235, which is +1 of default control port.
this can be deactivated by command line
Signed-off-by: hayati ayguen <h_ayguen@web.de>
hayati ayguen