That snow ball in front of the garage is my car.

Snow on 6th Feb 2009


Comment

3G-15m mast %2B vodafone in the far coner

Tetra mast and mobile phone mast fears and television transmissions.
Compare this information about television broadcasts, with that for public mobile telephone services and TETRA systems.A mobile phone held to the ear transmits with a power of approximately 2 Watts & due mainly to proximity a large proportion of this power is absorbed by the head. Mobile phone masts transmitt with aproximately 30 to 100 Watts The masts aerials are designed to aim the signal parallel to the ground, i.e. horizontally above the local ground, there for the signal is not so strong just under the aerial as you might imagine. At some distance from the aerial, the signal weakens due to it having spread out and it reduces in strength four times each time it doubles its distance. its called Square law.

Frequencies for mobile phones are in bands at approximately 900 MHz and 1,800 MHz and at 3 GHz.

UK UHF TV frequencies are, for channel 21 (474MHz) which is just above Tetra systems frequencies.
Through to the frequency for - channel 68 (850MHz) which is just below the lowest mobile phones band.

Hence one might reasonably expect that if this band of radio frequency signals were a health hazard then roughly the same hazard exists across the band, Tetra-TV-Phones. However, consider the following.

The Mendip TV transmitter near Wells transmits analogue T.V, channels with a power of 500,000.Watts, And digital T.V. with 20,000 Watts, from a very high mast and again aimed horizontally, and all round.
So the lowest mobile phone band is proportionally just higher than the T.V. channel 68, which runs approximately 10,000 times as much power. How many people have ever worried about this as compared to mobile phone masts? Has the strength of the T.V. transmission ever worried you? Should it?
Tetra systems used by the police use a band of frequencies just lower than T.V. channel 21 & much less power. It does leave a slight chance that some near by T.V. reception may be affected due to proximity & being on a near frequency but this is only likely in a poor T.V. signal area where a booster amplifier is fitted to the T.V. aerial, because the booster may have poor out of T.V. band rejection and so amplify the Tetra signal until it over powers the T.V. set aerial input circuitry, blocking or distorting theT.V.signal.

Accusations that mobile phone masts are a health hazard reminds me of hunting witches, if they can't prove them selves innocent they are assumed to be guilty & any unfortunate & unexplained incident near by gets blamed on them.
Don't let anyone confuse you between the damage done by ionizing (radio active) radiation and non ionising radiation (radio waves) Terms such as "low level radiation" apply to ionizing radiation & don't have the same meaning as a high or low amount of the same thing, its a difference in qualities.Ionizing radiation concentrates high energy into an extremely small area, as does a bullet, radio waves share energy over a wide front as does a wave arriving on a beach.

See report http://news.ulster.ac.uk/releases/2006/2089.html#

TETRA. Oficial information.

Radio spectrum for TETRA in Europe
The fast roll-out of TETRA in Europe partly resulted from the fact that a virgin frequency band was allocated for the emergency services based on agreement between the EU and NATO. As a result, European Public Safety and Security forces are using the radio frequency band 380-385//390-395 MHz for operation of their TETRA networks.

Within this emergency service TETRA spectrum allocation most of the radio frequencies are reserved for Trunked Mode Operation (TMO). The Direct Mode Operation (DMO) frequencies are typically allocated at the lower end of the radio frequency band (from 380 MHz upwards) and specific frequencies for Air-Ground-Air (AGA) operation are allocated at the upper end of the band (from 385//395 MHz downwards) to allow international compatibility.

For the European non-emergency services, TETRA frequencies are mainly allocated in the 410 to 430 MHz band with some countries allocating frequencies in the 450 to 470 MHz band.  Countries that are not members of NATO can sometimes allocate radio frequencies in the 385-390//395-399.9 MHz band for non-public safety TETRA users.

4) The TETRA technology utilises a Time Division Multiple Access (TDMA) system that is also used in technologies such as GSM, D-AMPS, iDEN. In all of these technologies the mobile/handset produces RF energy in short bursts. Concern has been expressed in relation to the somewhat lower rate at which TETRA bursts are transmitted. The TETRA Association is aware of research into the effects of this type of transmission although, at this time, we are not aware of any government or standards agency that has concluded that existing exposure limits should be reduced. As already stated, the Association would welcome further research into this area.
The comments relating to the burst transmission characteristics of mobile equipment do not apply to base station equipment as these transmit a continuous radio frequency.

International Commission on Non-Ionizing Radiation Protection (ICNIRP)
View/download http://www.icnirp.de/Documents/Emfgdl.PDF


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