What did the Stewart Report say about TETRA?
The Stewart Report (www.iegmp.org.uk) focused on mobile phones and onlylisted TETRA as one of the existing standards for mobile communications. The report did however review work on amplitude modulated signals. It noted that no obvious health effects had been suggested but recommended that as a precautionary measure modulation around 16 Hz should be avoided if possible for future systems. The TETRA standard, which involves 17.6 Hz modulation, was designed more than 10 years before the publication of the Stewart report.
