Posted: 11/2/2013 7:54:48 AM EDT
| Hello, I have a friend whom lives about 16-20 miles away. We can simplex on 2m at 50W, but we would like to try 10 meter ground wave. Unfortunately we both are running horizontal antennas, me a center fed dipole and him a double bazooka. Is there an antenna more suited for local 10m communications? |
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Quoted:
It's my understanding that this contact on 10 meters would be more line of sight than ground wave. I agree. I would characterize it as direct wave. Ground wave happens with much lower frequencies like MW broadcasting that someone mentioned earlier. Ground mounted verticals on one of the lower bands should work for them too. |
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We also have a 10m group rangeing from Ruskin FL up to Dade City, over to Clearwater and New Port Ritchey, and out to Lakeland. I live smack dab in the middle, in what is called New Tampa, near the I-275 / I-75 split.
Was using an IMAX 2000, 40' up in a pine tree till it was struck by lightning in 2010. Now using a SIRIO 827 at 20' to the feed point. 175' lmr400 buried in conduit from radios to feed. |
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Quoted:
http://i1270.photobucket.com/albums/jj601/wdlsguy/gwrange-frequency_zpsf17e4b04.jpg Vertical polarization works much better than horizontal polarization with groundwave (this is why AM broadcasters use vertical polarization). Lets talk more about this chart. 
How accurate is that? I would like to test that. |
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How accurate is that? I would like to test that. I'm trying to remember where I found that. 
It might have been this article: http://www.arrl.org/files/file/Technology/tis/info/pdf/8501031.pdf |
| On 10m you will have a bit better range compared to 6m or 2m etc due to lower plane earth losses, plus it "bends" better. Figure from 30mhz you will loose 2db for every 10 mhz to plane earth losses. However it really is mainly about antenna height over ground, higher is better. |