tag:blogger.com,1999:blog-6891312687175550342.post1118556740417905385..comments2024-03-27T13:53:17.950-07:00Comments on GM4FVM's radio world: OFCOM RF Field calculations and some modest openings.GM4FVMhttp://www.blogger.com/profile/10794029618635259984noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-6891312687175550342.post-41673829204413020812021-03-29T02:43:05.513-07:002021-03-29T02:43:05.513-07:00Hi Dave
You are right there, I imagine that severa...Hi Dave<br />You are right there, I imagine that several local "expert amateurs" round here have never heard of this even though Ofcom has written to them all. I suspect they will not know what it is or how to do it anyway.<br /><br />I have done this because I wanted to know what the results were myself. As it happens I did use the earlier information when I moved the antennas around.<br /><br />It will soon become a licence condition to have done it. That has not happened yet so it was curiosity that drove me to do it. I then found it was useful afterwards for deciding the antenna positions.<br /><br />It looks like you found all the issues with the Ofcom calculator that I did. The current RSGB one is easier to understand than that was and surely even the most limited amateur could use it.<br /><br />EMF levels are becoming a public health issue. I think that it is not Ofcom who are pushing this as Ofcom have nothing to gain from it. I think that it is pressure from public health people who want to be able to refute crazy notions about the effects of electromagnetism. Really, baseless Twitter conspiracy theories are to blame for all this.<br /><br />Sure, this is probably pointless for most. So are many of the licence conditions. However, as I was capable of doing the calculations it seemed easier to get on with it.<br /><br />73 Jim GM4FVMGM4FVMhttps://www.blogger.com/profile/10794029618635259984noreply@blogger.comtag:blogger.com,1999:blog-6891312687175550342.post-48119676123158683622021-03-27T15:02:40.040-07:002021-03-27T15:02:40.040-07:00The other thing that came to my mind. After you&#...The other thing that came to my mind. After you've put the power levels into the spreadsheet, calculated the minimum distances, and saved the results. What next? I don't think anyone is going to come round with a tape measure. Unless the people in your local area are aware of the regulations, and let's face it even many Radio Amateurs will not know, then what is going to happen?<br /><br />Unless you are unlucky enough to have someone who a) knows and b) can estimate that you are not compliant and c) complains enough so that OFCOM get fed up and come round, then it's all a big waste of hot air.<br /><br />Even if your 10MHz dipole is within a few metres of a fence line, it wouldn't take much to lift it up, or move it a bit. Maybe you could put in a planning application saying that you wanted to make sure that your antennas were high enough to ensure public safety?G0DJAhttps://www.blogger.com/profile/03870071838458780178noreply@blogger.comtag:blogger.com,1999:blog-6891312687175550342.post-12706689398729742102021-03-27T14:42:17.944-07:002021-03-27T14:42:17.944-07:00When I looked at just the OFCOM calculator it did ...When I looked at just the OFCOM calculator it did not take any account of the gain of the antenna, just the input power of the transmitter. It goes on to say that you should add together transmitters that will be transmitting at the same time.<br /><br />No account is taken of losses in coaxial cable, nor any gain for antennas, either in dBd or dBi. and it's only for frequencies abover 10MHz...<br /><br />All of my antennas are either on top of my house, and hence well outside the minimum access level, or in my back garden and, again. well outside where anyone can get to them.<br /><br />The regulations also relate to 'the public' so not you and I, or even our loved ones...<br /><br />It seems like a big fuss over not very much to me.G0DJAhttps://www.blogger.com/profile/03870071838458780178noreply@blogger.com