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#14
January 10th 09, 03:06 PM
posted to rec.radio.amateur.antenna
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How to estimate groundwave distance?
Richard Fry wrote:
On Dec 30 2008, 8:50 am, Eric wrote: Can anyone tell me the best way to estimate the groundwave coverage I'm likely to get on 75 meters? ___________ NEC shows this for a theoretically perfect 1/4-wave vertical monopole system: Frequency = 3.9 MHz Conductivity = 5 mS/m Applied Power = 100 watts Groundwave Field at 10 miles = 31.7 µV/m Groundwave Field at 20 miles = 14 µV/m RF Wouldn't a 200 degree vertical work better? |
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