Not sure where you are, but here in the US, the FCC regulates transmission power levels. Not sure what the limits are for these bands, but you can bet that they are below upset limits except for properly licensed transmitters such as radars. In general, causing interference to or upsetting other electronic systems is always illegal! Sure, there are labs, both private and government, where such work is ongoing, but those are usually under well controlled and regulated conditions. Private citizen doing so can get in hot water really quickly!