TETRA stands for ‘Terrestrial Trunked Radio’. It is the secure radio communications system used by Gardaí and other emergency services. Tetra masts are located on most garda stations and other areas around the country.
Both the handsets used by Gardaí and base-transmitters are more powerful than normal cellular ones “to give a more secure mode of communications”. TETRA is potentially dangerous because the system emits electromagnetic pulses at 17 Hz, a frequency which is known to affect brain activity. https://www.powerwatch.org.uk
Read Barry Tower’s report on health effects of TETRA Here
Gardai concerned that walkie talkie sets pose risks to their health – Irish Independent, March 2015
For more on Tetra and Health (UK site). Tetra is also currently used in the UK http://www.tetrawatch.net/main/introhealth.php