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It's unfortunate that there's not enough room on the reflector to
illustrate the relationships involved. At the appropriate angle an inverted vee dipole mimics two of the four lobes of half of a rhombic. Actually, if the truth were known, the ease of installation with just one support is the determining factor for most .... And, a rhombic "wastes" much radiation in achieving the gain it does produce. Later I'll have more OT comment about the absurd G5RV. 73 ! K0PP On Fri, Dec 7, 2018, 14:46 K9MA <[hidden email] wrote: > A flat dipole will have slightly more gain than an inverted V at the same > height. The inverted V will also have to be a bit longer. > > 73, > Scott K9MA > > ---------- > > Scott Ellington. K9MA > > --- via iPhone > > > On Dec 7, 2018, at 2:24 PM, Dick Dickinson <[hidden email]> > wrote: > > > > Oh…I guess I tend to think of dipoles as being linear in > configuration…such as horizontal dipole, etc. > > > > > > > > > > > > Dick – KA5KKT > > > > > > > > > ------------------------------------------------------------------------------- > > > > > > > > An inverted vee IS a dipole. > > > > > > > > -John NI0K > > > > > > > > Dick Dickinson wrote on 12/7/2018 2:55 PM: > > > >> Why is there so much promotion of dipole antennas over inverted vee > type antennas? > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> Kindly, > > > >> > > > >> Dick – KA5KKT > > > >> > > > > > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[hidden email] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [hidden email] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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No need for tutorials for me at this time. Now that I understand that when contributors use the term ‘dipole,’ it can encompass just about anything with two legs generally headed away from each other. Yes, yes, I understand there are many here that can turn that statement into argument…no need.
Dick – KA5kKT ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Rose
When I changed my 40 meter dipole from flat to inverted vee, I had to shorten the legs as the resonance point dropped about 150 KHz.
Brian Denley KB1VBF Sent from my iPad > On Dec 7, 2018, at 5:07 PM, Rose <[hidden email]> wrote: > > It's unfortunate that there's not enough room on the reflector to > illustrate the relationships involved. > > At the appropriate angle an inverted vee dipole mimics two of the four > lobes of half of a rhombic. > > Actually, if the truth were known, the ease of installation with just one > support is the determining factor for most .... > > And, a rhombic "wastes" much radiation in achieving the gain it does > produce. > > Later I'll have more OT comment about the absurd G5RV. > > 73 ! > > K0PP > > >> On Fri, Dec 7, 2018, 14:46 K9MA <[hidden email] wrote: >> >> A flat dipole will have slightly more gain than an inverted V at the same >> height. The inverted V will also have to be a bit longer. >> >> 73, >> Scott K9MA >> >> ---------- >> >> Scott Ellington. K9MA >> >> --- via iPhone >> >>> On Dec 7, 2018, at 2:24 PM, Dick Dickinson <[hidden email]> >> wrote: >>> >>> Oh…I guess I tend to think of dipoles as being linear in >> configuration…such as horizontal dipole, etc. >>> >>> >>> >>> >>> >>> Dick – KA5KKT >>> >>> >>> >>> >> ------------------------------------------------------------------------------- >>> >>> >>> >>> An inverted vee IS a dipole. >>> >>> >>> >>> -John NI0K >>> >>> >>> >>> Dick Dickinson wrote on 12/7/2018 2:55 PM: >>> >>>> Why is there so much promotion of dipole antennas over inverted vee >> type antennas? >>> >>>> >>> >>>> >>> >>>> >>> >>>> >>> >>>> >>> >>>> Kindly, >>> >>>> >>> >>>> Dick – KA5KKT >>> >>>> >>> >>> >>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [hidden email] >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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If a close match to 50 ohms is required, it is best to adjust the angle
for lowest SWR while maintaining resonance by adjustment of the length. 73 Bob, K4TAX On 12/7/2018 7:42 PM, Brian Denley wrote: > When I changed my 40 meter dipole from flat to inverted vee, I had to shorten the legs as the resonance point dropped about 150 KHz. > > Brian Denley > KB1VBF > Sent from my iPad > >> On Dec 7, 2018, at 5:07 PM, Rose <[hidden email]> wrote: >> >> It's unfortunate that there's not enough room on the reflector to >> illustrate the relationships involved. >> >> At the appropriate angle an inverted vee dipole mimics two of the four >> lobes of half of a rhombic. >> >> Actually, if the truth were known, the ease of installation with just one >> support is the determining factor for most .... >> >> And, a rhombic "wastes" much radiation in achieving the gain it does >> produce. >> >> Later I'll have more OT comment about the absurd G5RV. >> >> 73 ! >> >> K0PP >> >> >>> On Fri, Dec 7, 2018, 14:46 K9MA <[hidden email] wrote: >>> >>> A flat dipole will have slightly more gain than an inverted V at the same >>> height. The inverted V will also have to be a bit longer. >>> >>> 73, >>> Scott K9MA >>> >>> ---------- >>> >>> Scott Ellington. K9MA >>> >>> --- via iPhone >>> >>>> On Dec 7, 2018, at 2:24 PM, Dick Dickinson <[hidden email]> >>> wrote: >>>> Oh…I guess I tend to think of dipoles as being linear in >>> configuration…such as horizontal dipole, etc. >>>> >>>> >>>> >>>> >>>> Dick – KA5KKT >>>> >>>> >>>> >>>> >>> ------------------------------------------------------------------------------- >>>> >>>> >>>> An inverted vee IS a dipole. >>>> >>>> >>>> >>>> -John NI0K >>>> >>>> >>>> >>>> Dick Dickinson wrote on 12/7/2018 2:55 PM: >>>> >>>>> Why is there so much promotion of dipole antennas over inverted vee >>> type antennas? >>>>> Kindly, >>>>> Dick – KA5KKT >>>> >>>> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[hidden email] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> Message delivered to [hidden email] >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [hidden email] >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Rose
My dual-band inverted-V is 45 foot high at apex and 20-feet high at
ends. Years ago read this would make a good NVIS antenna. Its a fan type dipole with about six inches spread at ends. 40m bandwidth is narrower than a separate dipole. I have the longer legs tuned for 3900 KHz so to work low end I use a tuner. It works well out to 800-1000 miles on 75m and farther on 40m. The Marine HF SSB stations use 4125-KHz in AK as a calling and emergency frequency. A dipole is common for shore stations. Comm Sta Kodiak (USCG) uses this channel thru out AK. 73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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