Nominal ADC frequency and ppm correction #171
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ADC nominal freq Hz param, corr reference ppm param, pll programming freq display
Dialol layout depends on host application
Cancel added ADC freq range 50-140MHz 6 IF band over 80 MHz
SetPPMvalue implemented, IFrateInfo todo
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Hi,
This PR possibly solves issue #110. The parameter adcnominalfreq is defined. It is the nominal frequency value of the ADC, which is synthesised by the Si5351a PLL with a resolution approaching one Hertz.
Its value can be modified in the ExtIO.dll dialog between 50 and 140 MHz.
The gfFreqCorrectionPpm parameter represents the correction to be applied to the pll reference to correct its accuracy. Its value can be between +-200 ppm.
The ExtIO.dll dialogue is changed between the case where the dll is used by HDSDR that allows dynamically the choice of parameters like IF bandwidth from its GUI and the case of other SDR apps that do not offer this method.
The HF103 radio that uses a fixed frequency xtal is not controlled by this code at this moment.
My proposed layout changes are as in the following picture.
The RF gain box controls HF attenuator and LNA gain when the VHF tuner is used.
In HF the IF gain is used to control input VGA of RX888 mkII while is NA in RX888.
In VHF it controls the inner gains of the tuner.
Possibly the label IF may be changed in VGA (Voltage Gain Amplifier) ?
Oscar