@ Lee - yes that would be helpful.
PAW on bench in workshop.
When running from the PowerBank, voltage measured from the 2nd USB port on it is 5.2v.
There is a fan in my case. With it connected, throttled=0x50005 - voltage measured on pins 1&3 (from the left) of JP2 on the bridge board are: 4.86v
With the same PowerBank, but fan removed, still have throttled=0x50000 and pin voltage is 4.88v - so the additional load from the fan drops it a bit, but it's still not happy without it.
Running from a bench PSU set to 5.14v, it reports about 700mA most of the time (no fan).
Voltage on bridge P1&3 is 4.82v
Still have throttled=0x50005
BUT - this is via a chopped cheapo USB cable to bench PSU (didn't want to chop up the decent one that came with the PAW)
Decent cable with bench PSU @ 5.14v: (connected to chassis-mount USB, to bench PSU): throttled=0x50000, pin voltage 4.83v
So still not perfect.
Bench PSU @ 5.27v via decent cable: throttled=0x0, pin voltage 4.98v - so the extra 0.1v here helps. Bench PSU has a 1.5m cable so there will be some voltage drop.
Running from Pi Battery board (that no-one liked in another post!)
throttled=0x0
Voltage at board 2nd USB socket (while PAW loading the other): 5.09v - on this board the output are in parallel. On the PowerBank above they are independent with different current ratings, so I think the 5.2v on it is not representative of the feed to the PAW.
Voltage at pins, 4.9v - seems happiest on this!
Same, but with fan connected again, still throttled=0x0, pin voltage 4.86v
I'll try the Pi battery at Luton to see if I get any more traffic reported. None at home (2m from airport!)
So it seems the PAW is *very* fussy about voltage, a 0.1v drop in the supply is enough to make it complain.
Is the Pi3 as bad? I'm involved with a project using Pi3's in remote locations fed from 18850 cells via cheapo 5v regulators (intended for RC gear) which output ~5.03v with NO power issues.