External Attenuator for Kiwi's during high MUF conditions [ADC level interface in v1.594]
It seems that as conditions and MUF have been peaking that the 14 bit limitations of the Kiwi ADCare becoming more obvious. Many of the better Kiwi receive sites are having to work to keep large SW broadcast signals from over-running the ADC which in a fixed gain environment means filtering and careful system gain setting.
While filtering can be a way out of this predicament, it would seem to me to not be difficult or expensive to build a  dB step attenuator with a USB interface that could plug into the Kiwi/BB and potentially allow dynamic adjustment of the overall gain to allow a system to get nearer the propagated noise floor during times when SW BC isn't limiting while also accomodating that situation.
This perhaps isn't the ideal solution but it would be more general than filtering which has requirements unique to each Kiwi system.
How difficult would it be to provide a measure of maximum ADC level so that a $5 Psemi attenuator and inexpensive one board controller might dynamically adjust to suit conditions while controlled and powered by the Kiwi, or even by a remote host, if that is too difficult? It's easy to turn the attenuation up when the present OV indication fires but I see no way to know when system gain might be restored when conditions permit. Is there any way to read ADC maxima so that a Kiwi extension might do it all?
If this is viable, I'm willing to look at designing and fab'ing some suitable HW.