I would like to determine the *exact* frequency of the HackRF when set to a given frequency. Like nearly all modern tuners they use "fractional-N" synthesis. They can only tune to frequency steps that are often not a simple fraction of 1 Hz, and this step size often varies with operating band.
I'd like to have either of two things, ideally both: A formula that gives the exact frequency to which the HackRF tunes when set to frequency 'f'. A frequency where the HackRF synthesizer is exactly correct (assuming an accurate timing reference) and the minimum frequency step that will keep the synthesizer exactly on frequency throughout the HackRF's coverage range. (This step size may vary with band as various dividers are changed, but using the largest step size across the full coverage is the easiest way.) If I know the actual frequency of the synthesizer I can easily correct for any offset in the software oscillator I use to downconvert the low digital IF to DC. I could probably figure this out by digging into the firmware and the synthesizer data sheets, but I wanted to first see if someone could save me the trouble. Thanks! Phil Karn, KA9Q _______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
