Found in a school for turning on/off the lights based on presence of people - sits right on 5.80 GHz (and drifts a bit as it warms up). Despite it's narrow bandwidth, it wreaks havoc on both ch. 161- and 157+ due to it's relatively high output power and 100% duty cycle.

Manufacturer is cpelectronics UK, they have multiple models using 5.8GHz, this one in particular was a MWS6-PRM

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mws6-prm.wsr