A HyperWave Broadcaster or Caster for short is a device capable of communication and detection at great distances using HyperWave, radiation of unknown composition that presumably propagates via HyperSpace, that travels at superluminal speeds from a TrueSpace perspective and allows near-instantaneous communication through the HyperSpatial frame of reference from within TrueSpace.
Though HyperWave transmissions are much more robust than electromagnetic transmissions through TrueSpace or HyperSpace, they can be jammed by transmissions on the same frequency, blocked by force fields like an Ur-Quan slave shield (though a very sensitive receiver, such as those contained naturally within Chenjesu bodies, can detect transmissions from inside a slave shield if the transmission is sufficiently powerful) and tend to lose coherence and disperse over long distances.
Aside from the very subtle ability to detect and transmit HyperWave that evolved naturally within the Chenjesu's crystalline biology, which other species have been unable to reproduce, all spacefaring species use essentially the same principles in HyperWave communication and detection, usually discovered independently near the beginning of a species' atomic age, with some exceptions (such as the Humans). Powerful HyperWave 'Casters tend to be relatively large, expensive pieces of equipment and are therefore standard for planetary or orbital installations but smaller devices appear to be able to be installed on many starships; most ships tend to use a combination of HyperWave and electromagnetic communication devices.
Most high-power HyperWave Casters broadcast on certain predetermined frequencies or channels within a limited range, sending out programming from various stations for information, advertising or entertainment. This practice ended in many parts of local space after the invasion of the Ur-Quan Kzer-Za and Kohr-Ah made it extremely dangerous for a species to broadcast its location.
It is prossible that a ship's Hyper-Radar uses HyperWave radiation to detect and track squadrons of starships travelling through HyperSpace similar to traditional radar. However it is incapable of identify the type and number of starships within the squadron. It is also unknown whether HyperWave receivers can be used to monitor transmissions in the ordinary electromagnetic spectrum, or if traditional radio apparatus is built in separately into the devices.