We just learned that our controllers in the field exhibit "weird" behavior when a walkie-talkie is keyed for transmit near them.
-- Commercial, name-brand units (e.g. Kenwood, Motorola) on legal frequency bands.
-- Power setting unknown at this time, but probably/perhaps the max for this type of unit.
We'll be doing more investigation. The request here is for ideas on what might be affecting our AVR apps.
This particular unit is in a stainless-steel case, but there is a window for display/keypad.
AVRs inside running at 4MHz-8MHz. Could the crystal be affected? What would typically be affected by this type of external noise?