Fixed range limitation of channel analyzer delta frequency dial

plugins/channel/chanalyzer/chanalyzergui.cpp

@@ -294,6 +294,7 @@ ChannelAnalyzerGUI::ChannelAnalyzerGUI(PluginAPI* pluginAPI, QWidget* parent) :
 	DSPEngine::instance()->addThreadedSink(m_threadedChannelizer);
 
 	ui->deltaFrequency->setColorMapper(ColorMapper(ColorMapper::ReverseGold));
+	ui->deltaFrequency->setValueRange(7, 0U, 9999999U);
 
 	ui->glSpectrum->setCenterFrequency(m_rate/2);
 	ui->glSpectrum->setSampleRate(m_rate);