The new police radio in the UK uses channel hopping Geoff.
That's not the same as commercial radio/TV.
Even the users don't like the RF safety aspect from what I've read.

On Feb 1, 7:17 am, "Geoff Wood" <[email protected]> wrote:
> > -----Original Message-----
> > From: [email protected] [mailto:hum-
> > [email protected]] On Behalf Of Trev
> > Sent: Sunday, 1 February 2009 7:56 p.m.
> > To: Hum Sufferers
> > Subject: Re: The Cell Phone "Tower of Doom" - Articles
>
> > You're conveniently forgetting sidebands Geoff!
>
> What about them ? There are no 'sidebands' as such with FM, and AM has
> always had them, apart from SSB channels, which usually also have suppressed
> carrier.
>
> >The channel switching
> > that goes on in Tetra for instance produces sharp wave fronts at
> > microvave freqs and given the receptiveness of brain tissue to the
> > switching rate cannot just be discounted, Where are the safety tests?
>
> No it doesn't. What comes out of a cell-phone tower is a constant level at a
> constant bandwidth , with a constant amount of modulation. There are no
> out-of-band emissions, else adjacent channel allocations would be interfered
> with and everybody would be most annoyed.
>
> > Humans are not wideband receivers.They are selective and sensitive
> > organisms.
>
> Bollocks.  Humans 'receive' all the frequencies that they are being
> irradiated with.
>
> > The time constant for sickness is 10+ years. In 10 years we'll check
> > the Alzheimers and  kids Leukemia figures.,sure.
> > It will be too late
>
> And what about the greater levels of RF that have been de rigour for
> decades?  Cellphone towers are low power, and DTV requires significantly
> lower rf levels than analogue TV ever did.
>
> > The Gov'rt will be very sorry ..... and the taxpayer will pick up the
> > bill.
> >  Profits due will already be banked /spent on some new wheeze.
> > You are so complacent..
>
> Not complacent at all, just realistic and not neurotic.
>
> > On another thread here you talk of tripe being spoken just because you
> > don't agree.
>
> No , it is 'tripe' because it is more often than not,  patently flawed
> factually.
>
> > Well , your views are tripe- dressed up in techy jargon as you never
> > produce an ounce of proof .
> > Your views are totally subjective and no more valid than any other and
> > often a lot more irritating to boot!
>
> As you like. I can rationalise ANY of my assertions, and seem to be able to
> easily spot basic flaws in many of the other 'theories' and point them out -
> which most then summarily ignore/dismiss as 'biased'.  Call that subjective
> if you like.  I call it  objective.
>
> I do not like my Hum any more than anybody here.  But it does not make me
> feel like some sort of pioneer/hero to champion ideas that are just plain
> silly.
>
> geoff
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