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You will probably be told that Airwave is operating within its licence and that the problem is yours, particularly if youre using a cheap TV and an aerial amplifier!
Here is one filter device to fix the problem. No guarantees from Tetrawatch, since we know of places where similar filters do not completely solve the problem, but it wont break the bank.
PPG8: Planning Policy Guidance 8: Telecommunications interference
The technical reason for interference from TETRA
This TV engineer says the interference pattern is a result of pulsing!
The sound of a TETRA base station. Some of us can hear it on our TVs.
Confederation of Aerial Industries
Ofcom (or telephone 020 8645 2200)
Ofcom and the problem with devices such as car key fobs
Youre not alone! Llangennith, Dursley, etc.
... and Dumfries. Who should pay?
The Institution of Electrical Engineers
New Scientist article on interference with medical equipment
Admission by phone operators that masts can interfere with cochlear implants
Notice of inquiry under the disability discrimination act 1992: mobile phones and people with hearing impairment (Australia)
Medical Devices Agency on TETRA interference
Your car could be brought to standstill by TETRA? Is that safe?!
Or not start in an emergency: Police radio system disables black taxis in Edinburgh
2002: Medical Devices Agency warns of interference
The sign reads: Persons fitted with heart pacemakers or similar devices are advised to avoid antenna installation areas.
These are just the base stations with no pulse and such low, low intensity that they are thousands of times inside the safe limits.
(click pic to enlarge)