I'm making a control system for an autonomous plane. Every gram counts
so I'm planning on using a high frequency step-down switching
regulator to provide power. My worry is that EMI from the LT1940
switcher may interfere with radio communications. The plane has two
independent radio systems - one for two-way telemetry and one to allow
override of its control system when bugs happen. So I don't want EMI
from the switcher to screw up either of these systems.

What isn't clear to me is how I can tell how much of a problem I have
with EMI. What can I do to measure the amount of EMI or the effect
it's having on the radios? Preferably without crashing the plane in
the process, that is.

And if there are problems with EMI what would the lowest weight
solutions be? Would putting foil around the power supply and some
small ferrites on the power lines be likely to do the job?

Thanks,
Zik
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