Re: [Elecraft] [KX3] OT: NVIS with KX3
I've heard it said that a wire on the ground as a reflector improves NVIS coms if the ground is poor. I can't model this, but perhaps someone could comment. I'm inclined to think that it might take several wires on the ground to make a difference. It's an interesting idea to play with. David G3UNA - Original Message - From: Wayne Burdick n...@elecraft.com To: k...@yahoogroups.com Cc: Elecraft elecraft@mailman.qth.net Sent: Thursday, April 24, 2014 4:27 PM Subject: Re: [Elecraft] [KX3] OT: NVIS with KX3 Hi Johnny, On 40 meters, I work all over the West Coast (0-1000 miles north/south) during the daytime with 5 to 10 W. The antenna is a random-length OCF dipole about 15' off the ground. I'm not sure how many clouds I'm burning, but many of the stations I work are short- and medium-range. I think this should work in your situation. Wayne N6KR On Apr 23, 2014, at 9:03 PM, Johnny Siu vr2...@yahoo.com.hk wrote: Hello elecrafters, It is off topic and you may wish to press 'del' button now. Local ham clubs together with some hams in the China Mainland are going to do some drilling in ARES within the Pearl River Delta area (with a radius of about 50km). NVIS could be one of the operation to trial run for ARES. My questions are: 1. Is the power output say 10w from KX3 good enough for such purpose under SSB? We don't want CW which requires training operators. Phone mode can be operated by anyone with minimal guidance (a simulation under emergency). 2. During day time, is 40m a proper band to use (no 60m band in ITU Region 3)? If yes, what will be usually frequencies used such proposes? 3. I am going to use Buddipole for the NVIS antenna. Did you go good results for similar operation in the past? Looking forward to your advice and thanks in advance. Please reply off-the-list so as to save the bandwidth here. 73 Johnny VR2XMC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [KX3] OT: NVIS with KX3
I've heard it said that a wire on the ground as a reflector improves NVIS coms if the ground is poor. A single wire under the dipole doesn't do much. Less than a dB according to EZNEC. Any parasitic effect is muddled by the reflector being on the ground. It's mostly about height. About 25 ft over average ground for 40 meters is best. Some go lower for a perceived receive advantage. I've tried 12 ft and it's much worse than 25 ft. YMMV Brian, K0DTJ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [KX3] OT: NVIS with KX3
Hi Johnny, On 40 meters, I work all over the West Coast (0-1000 miles north/south) during the daytime with 5 to 10 W. The antenna is a random-length OCF dipole about 15' off the ground. I'm not sure how many clouds I'm burning, but many of the stations I work are short- and medium-range. I think this should work in your situation. Wayne N6KR On Apr 23, 2014, at 9:03 PM, Johnny Siu vr2...@yahoo.com.hk wrote: Hello elecrafters, It is off topic and you may wish to press 'del' button now. Local ham clubs together with some hams in the China Mainland are going to do some drilling in ARES within the Pearl River Delta area (with a radius of about 50km). NVIS could be one of the operation to trial run for ARES. My questions are: 1. Is the power output say 10w from KX3 good enough for such purpose under SSB? We don't want CW which requires training operators. Phone mode can be operated by anyone with minimal guidance (a simulation under emergency). 2. During day time, is 40m a proper band to use (no 60m band in ITU Region 3)? If yes, what will be usually frequencies used such proposes? 3. I am going to use Buddipole for the NVIS antenna. Did you go good results for similar operation in the past? Looking forward to your advice and thanks in advance. Please reply off-the-list so as to save the bandwidth here. 73 Johnny VR2XMC __._,_.___ Reply via web post Reply to sender Reply to group Start a New Topic Messages in this topic (1) VISIT YOUR GROUP • New Members 18 • New Photos 8 • Privacy • Unsubscribe • Terms of Use . __,_._,___ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [KX3] OT: NVIS with KX3
Since you are going to operate only one band, why not a resonate dipole. 40 meters should be ok and the antenna is only 66 feet long. The added benefit is no antenna tuner needed. You will find shortened antennas like the Buddipole are not that efficient. I would suggest that before the trip, try a couple of different configurations locally with your friends using 40 meters as a test, 73 de George, W6GF On Thursday, April 24, 2014 8:43 AM, Wayne Burdick n...@elecraft.com wrote: Hi Johnny, On 40 meters, I work all over the West Coast (0-1000 miles north/south) during the daytime with 5 to 10 W. The antenna is a random-length OCF dipole about 15' off the ground. I'm not sure how many clouds I'm burning, but many of the stations I work are short- and medium-range. I think this should work in your situation. Wayne N6KR On Apr 23, 2014, at 9:03 PM, Johnny Siu vr2...@yahoo.com.hk wrote: Hello elecrafters, It is off topic and you may wish to press 'del' button now. Local ham clubs together with some hams in the China Mainland are going to do some drilling in ARES within the Pearl River Delta area (with a radius of about 50km). NVIS could be one of the operation to trial run for ARES. My questions are: 1. Is the power output say 10w from KX3 good enough for such purpose under SSB? We don't want CW which requires training operators. Phone mode can be operated by anyone with minimal guidance (a simulation under emergency). 2. During day time, is 40m a proper band to use (no 60m band in ITU Region 3)? If yes, what will be usually frequencies used such proposes? 3. I am going to use Buddipole for the NVIS antenna. Did you go good results for similar operation in the past? Looking forward to your advice and thanks in advance. Please reply off-the-list so as to save the bandwidth here. 73 Johnny VR2XMC __._,_.___ Reply via web post Reply to sender Reply to group Start a New Topic Messages in this topic (1) VISIT YOUR GROUP • New Members 18 • New Photos 8 • Privacy • Unsubscribe • Terms of Use . __,_._,___ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to georgefrit...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [KX3] OT: NVIS with KX3
A dipole cut for the band is certainly best, but in a pinch, compromise antennas will still allow you to make a few contacts. I've checked into 40 meter nets many times running 3 watts (SSB) into a 25' sloping wire tossed into a tree, or 10 W mobile into a 52 center-loaded whip. Wayne N6KR On Apr 24, 2014, at 8:57 AM, george fritkin georgefrit...@yahoo.com wrote: Since you are going to operate only one band, why not a resonate dipole. 40 meters should be ok and the antenna is only 66 feet long. The added benefit is no antenna tuner needed. You will find shortened antennas like the Buddipole are not that efficient. I would suggest that before the trip, try a couple of different configurations locally with your friends using 40 meters as a test, 73 de George, W6GF On Thursday, April 24, 2014 8:43 AM, Wayne Burdick n...@elecraft.com wrote: Hi Johnny, On 40 meters, I work all over the West Coast (0-1000 miles north/south) during the daytime with 5 to 10 W. The antenna is a random-length OCF dipole about 15' off the ground. I'm not sure how many clouds I'm burning, but many of the stations I work are short- and medium-range. I think this should work in your situation. Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
