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10m ground wave expectations
On Fri, 27 Apr 2007 08:47:55 -0700, Joey wrote:
Hi, I'm trying to determine if I could use 10 meters to contact a station about 75 miles away Hi Joey, That's hit number one, distance at this wavelength. with about 2500ft elevation of a couple sets of hills in between That's hit number two with the terrain against you. with just simple antennas on either end. That's hit number three, antennas without gain. Perhaps a 10m dipole on one end and some kind of stealthy one on the other. That's hit number four, every possibility of being cross polarized, and with at least one antenna masked by building or foliage to qualify as "stealthy." I assume this would have to be ground wave only given the distance and current band conditions. You might try NVIS, but what you say, as follows, doesn't give you many band options. My parents are both techs so we're currrently limited to parts of 10m as the lowest band It's time to upgrade. Consult the new rule changes, take a practice test, and see what happens. and I'd like to have something reliable without need repeaters for disaster comms. Then you really need to stop rationalizing about having a "stealth" antenna. If this was Hurricane Katrina, how long can you call CQ under water? 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... Try it first before giving up. 73's Richard Clark, KB7QHC |
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10m ground wave expectations
I figured it was a long shot. By "stealth" i just mean something low
profile and the other end doesn't have much yard space and a big verticle is certainly not going to be sticking up on top. I suppose I could making something that's just deployable when needed since this isn't for day to day use... seems upgrading may help....thx... On Fri, 27 Apr 2007 09:25:17 -0700, Richard Clark wrote: On Fri, 27 Apr 2007 08:47:55 -0700, Joey wrote: Hi, I'm trying to determine if I could use 10 meters to contact a station about 75 miles away Hi Joey, That's hit number one, distance at this wavelength. with about 2500ft elevation of a couple sets of hills in between That's hit number two with the terrain against you. with just simple antennas on either end. That's hit number three, antennas without gain. Perhaps a 10m dipole on one end and some kind of stealthy one on the other. That's hit number four, every possibility of being cross polarized, and with at least one antenna masked by building or foliage to qualify as "stealthy." I assume this would have to be ground wave only given the distance and current band conditions. You might try NVIS, but what you say, as follows, doesn't give you many band options. My parents are both techs so we're currrently limited to parts of 10m as the lowest band It's time to upgrade. Consult the new rule changes, take a practice test, and see what happens. and I'd like to have something reliable without need repeaters for disaster comms. Then you really need to stop rationalizing about having a "stealth" antenna. If this was Hurricane Katrina, how long can you call CQ under water? 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... Try it first before giving up. 73's Richard Clark, KB7QHC |
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