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Tech Head - The Technology Section
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Radio Caroline goes legal
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<blockquote data-quote="s-band" data-source="post: 1017131" data-attributes="member: 407744"><p>It would take more than the 30 mins I spent to do it properly but here's a guess at the probability of being able to receive Caroline, during the day, in the east of England. The ITU graph used (attached) is based on a 1kW ERP TX, which is convenient. However, the antenna is electrically short. I've assumed medium, dry, ground and noise levels as shown by the horizontal lines on the graph. The noise levels (red lines) are based on approximate data from here <a href="https://www.lbagroup.com/resources/quick-determination-of-medium-wave-coverage-application-note-15" target="_blank">Quick Determination of Medium Wave Coverage – Application Note 15|Resources</a></p><p></p><p>The map shows predicted coverage circles for city, rural and quiet rural (summer) noise levels. It sort of ties in with the coverage area given in the application for which the locations mentioned are shown as red spots. The coverage area prediction would change dramatically if I have the soil type wrong.</p><p></p><p>[ATTACH]107718[/ATTACH]</p><p></p><p>648kHz was used by BBC World Service so is fairly clear if other stations. <a href="http://www.mwlist.org/mwlist_quick_and_easy.php?area=1&kHz=648" target="_blank">MWLIST quick and easy: Europe, Africa and Middle East</a> There are a couple of lowish power ones in Europe and a 2MW one in Saudi. I think that there's a good chance of receiving Caroline over a large area at night, providing that you are in a low noise location. [USER=187415]@hvdh[/USER], I suppose if you take a trip to the coast you might hear it as it would be a sea path;-)</p><p></p><p>[ATTACH]107719[/ATTACH]</p></blockquote><p></p>
[QUOTE="s-band, post: 1017131, member: 407744"] It would take more than the 30 mins I spent to do it properly but here's a guess at the probability of being able to receive Caroline, during the day, in the east of England. The ITU graph used (attached) is based on a 1kW ERP TX, which is convenient. However, the antenna is electrically short. I've assumed medium, dry, ground and noise levels as shown by the horizontal lines on the graph. The noise levels (red lines) are based on approximate data from here [URL='https://www.lbagroup.com/resources/quick-determination-of-medium-wave-coverage-application-note-15']Quick Determination of Medium Wave Coverage – Application Note 15|Resources[/URL] The map shows predicted coverage circles for city, rural and quiet rural (summer) noise levels. It sort of ties in with the coverage area given in the application for which the locations mentioned are shown as red spots. The coverage area prediction would change dramatically if I have the soil type wrong. [ATTACH]107718[/ATTACH] 648kHz was used by BBC World Service so is fairly clear if other stations. [URL='http://www.mwlist.org/mwlist_quick_and_easy.php?area=1&kHz=648']MWLIST quick and easy: Europe, Africa and Middle East[/URL] There are a couple of lowish power ones in Europe and a 2MW one in Saudi. I think that there's a good chance of receiving Caroline over a large area at night, providing that you are in a low noise location. [USER=187415]@hvdh[/USER], I suppose if you take a trip to the coast you might hear it as it would be a sea path;-) [ATTACH]107719[/ATTACH] [/QUOTE]
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Radio Caroline goes legal
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