Changed HackRF sample rate list

Readme.md

@@ -77,6 +77,8 @@ If you use your own location for libhackrf install directory you need to specify
 
 `-DLIBHACKRF_LIBRARIES=/opt/install/libhackrf/lib/libhackrf.so -DLIBHACKRF_INCLUDE_DIR=/opt/install/libhackrf/include`
 
+HackRF is better used with a sampling frequency over 8 MS/s. You can use the 9.6Ms/s setting that decimates nicely into integer kS/s sample rates. There are quite a few problems with narrowband work with this hardware. You may try various amplifiers settings to limit images and I/Q imbalance with varying success... The cheap RTL-SDR dongles usually do better.
+
 <h2>FunCube Dongle</h2>
 
 Both Pro and Pro+ are supported with the plugins in fcdpro and fcdproplus respectively. For the Pro+ the band filter selection is not effective as it is handled by the firmware using the center frequency.

plugins/samplesource/hackrf/hackrfgui.cpp

@@ -265,7 +265,7 @@ void HackRFGui::updateHardware()
 	m_updateTimer.stop();
 }
 
-unsigned int HackRFSampleRates::m_rates_k[] = {2500, 3200, 5000, 6400, 10000, 12800, 19200};
+unsigned int HackRFSampleRates::m_rates_k[] = {2400, 3200, 4800, 6400, 9600, 12800, 19200};
 
 unsigned int HackRFSampleRates::getRate(unsigned int rate_index)
 {