On Saturday I worked on some further testing including the frequency coverage of the device. At the bottom end, we seem to be able to consistently achieve coverage down to 52MHz and up to beyond 2,000MHz.
The spec sheet of the tuner chip states “64 to 1,700MHz” however we have found a gap between 1,100MHz and 1,270MHz where the local oscillator won’t lock. I’m currently characterising this across preproduction devices to determine a guaranteed coverage. We may be able to improve things by altering the fractional-N and post divider settings, but I suspect that this is a flaw in the tuner chip’s specification.