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10m ground wave expectations
Joey wrote in news:dd64339h0kluu9d5kqu0tff6h9r6nmpbdl@
4ax.com: Hi, I'm trying to determine if I could use 10 meters to contact a station about 75 miles away with about 2500ft elevation of a couple sets of hills in between with just simple antennas on either end. Perhaps a 10m dipole on one end and some kind of stealthy one on the other. I assume this would have to be ground wave only given the distance and current band conditions. My parents are both techs so we're currrently limited to parts of 10m as the lowest band and I'd like to have something reliable without need repeaters for disaster comms. We actually only have a few single hop VHF/UHF repeaters between us, though quite a few linked ones. I've also thought of 6m due to smaller antenna requirements, but I'm pretty sure this is too far... Thanks! Joey, You have given a lot of information, and yet too little. The distance you nominate can be a challenge, yet routinely possible on frequencies from 28MHz to 440MHz, depending.... My thoughts are that simplex contacts will be unlikely without effective outside antennas, though not necessarily directional antennas, but they would help. You note you may have access to several repeaters, than can certainly equalise bad locations or impossible paths (eg granite), but then you might not want to conduct family chat on repeaters (though that is they way they seem to have gone here since many of our new six hour hams with their shack on their belt seem to be family members). An FM repeater in a very good location may support contacts reliably out to 150+km for each station, depending... Another possibility might be using IRLP build a path. To give you an example, I can work the 2m repeater at Mt Ginini (exceptional site) from the car on my driveway here at Narooma, 155km (~ 95mi) over mountains etc (but we don't have real mountains here do we?), it would be easier with a 5dB gain omni on the house. I could use a handheld to make the trip to a repeater 90km (~56mi) away and use IRLP to anywhere in the world (if I liked IRLP). Then by contrast, there would be places where you couldn't work a repeater 10km away with a handheld. So, it may be that a path via a VHF or UHF repeater might be more viable than 10m. Perhaps some experimentation is in order, that is what ham radio was about once. Owen |
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