Wireless Waffle - A whole spectrum of radio related rubbish
A Noisy Transatlantic Oystersignal strength
Monday 23 April, 2007, 15:16 - Amateur Radio
annoyedoysterIn a previous post I discussed the fact that the powers that be in Europe had taken a decision with respect to low power, licence exempt radio equipment that meant that the 'heart' of the 70 centimetres amateur radio band had been ripped out due to a mountain of noisy interference produced by wireless doorbells, weather stations and so on.

But that's not the end of the story, or so it would seem. Not content with annoying noisy oysters by wiping out 433.500 MHz (the EU 70cms FM calling channel) as well as the repeater input and output frequencies in the UK (as well as Finland, Slovenia and certain other countries) from 433.000 to 433.375 paired with 434.600 to 434.975 MHz, I recently discovered that they have also managed to pull the wool over our eyes with respect to another travesty against 70 cms radio amateurs. But this time, it's not those of us in Europe that are suffering, it is amateurs in the USA and in particular, in areas where European tourists congregate.

What would be the worst possible frequency to interfere with? Probably the calling frequencies which in Europe are 433.500 for FM (already messed up with the aforementioned low power devices) and 432.200 for SSB. But hang on... US amateurs have a wider 70cm allocation, from 420 to 450 MHz and... their FM calling frequency is 446.000 MHz. So what type of wool have the ERO pulled over the eyes of US amateurs then? PMR 446 of course! Yes, this low power (half a Watt) licence exempt walkie-talkie technology runs on frequencies from 446.000 to 446.100 (and recently extended to 446.200 for digital modulation) - slap bang in the middle of the US 70 cms FM calling and working channels.

woolpulledNow obviously, there's little, or no chance, of UHF signals propagating from Europe to the US, so the likelihood of European PMR 446 equipment causing a problem to American amateurs is nil isn't it? Well, if the equipment is used in Europe there is no chance of interference. However, if it's taken to the US by European holidaymakers to allow them to keep in touch with each other whilst on the beach, at a theme park, or even whilst lost amongst the endless miles of aisles at Wal*Mart, then yes! And this is just what is happening. Europeans, blissfully unaware that their equipment is operating illegally once taken outside the EU, are using PMR 446 equipment in the USA (and Canada) and, in the process, producing endless interference on the main FM channels.

Somewhere in the basement of the ERO, CEPT or similar, someone is having jolly good fun thinking up increasingly intricate wheezes for messing up the 70 cms amateur bands. What next? How's about sharing the band with a very high powered radar that wipes out reception across most of Northern Europe? Oh, I forgot, they've already done this haven't they...!
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