I just looked in some of my old ARRL Handbooks. The earliest I find the chart described as “Practical arrangement of a shortened antenna” is in the 1948 edition of the handbook. The 1944 edition has a very similar chart talking about multi band antennas but the description is somewhat different.
73, Chuck, AA3CS ------ “It's still magic even if you know how it's done.” -- Terry Pratchett > On 23 Mar 2020, at 21:53, Bob McGraw K4TAX <rmcg...@blomand.net> wrote: > > The same antenna, although not named the G5RV, is described in the 1956 ARRL > Handbook, Chapter 14, page 343. Fig 14-19 "Practical arrangement of a > shortened antenna." It may have been described in an earlier publication, > however the 1956 Handbook is the earliest I have for reference. > > The description shows "A" as the length of 1/2 of a dipole where "2A" is the > dipole total length and with the total length being less than 1/2 wavelength > as shown in table 14-1. The open wire feed line "B" is then 1/2 of "A". > Therefore A + A + B + B becomes the length of the standard 1/2 wave antenna. > When the length of A + A is is greater than a 1/4 wavelength the > effectiveness of the antenna is not changed. > > Table 14-1 shows the length of the antenna to be 135 ft with a feeder length > of 42 ft. covering 3.5 - 28 MHz which uses parallel feed for 3.5 - 21 MHz and > series feed for 28 MHz. A shortened version shows the antenna length to > be 67 ft with 42.5 ft feedline. In this case 3.5 MHz is series fed and 7 - > 28 MHz is parallel fed. > > Regarding connecting a balanced feed line to the transmitter, Fig 14-21 (B) > reference is made to do so using a pair of "balun" coils. This would imply > a proper balun would contain two separate coils existing on two separate > cores. The discussions by W8JI and DJ0IP would imply a single core will not > be the correct design although it may contain 4 windings existing on a signal > core. The original Heathkit balun, being two separate air wound dual > winding coils would satisfy the requirement. > > Yes, more interesting trivia. > > 73 > > Bob, K4TAX > > > On 3/23/2020 8:18 PM, Jan wrote: >> I first learned of the G5RV Antenna back in early 1963 in Malaya ~ as the >> Editor for the *M*alayan *A*mateur *R*adio *T*ransmitter *S*ociety's >> /NewsLetter/ . Jim, 9M2DQ (a rubber estate manager) sent me a copy of Mr. >> Varney's article; a simple wire antenna that covered 80-40-20-15-10 Meters. >> >> It became a popular antenna in South-East Asia ~ with many using it for >> chatting on 14.320 MHz ~ which became the SEA-NET in 1963 and beyond. I >> have fond memories of using it at 9M2JJ for two and a half years at the >> Secondary Trade School; where I taught as a Peace Corps Volunteer. >> >> Cheers, Jan K1ND >> >> >> >> >> ______________________________________________________________ >> 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 rmcg...@blomand.net > > ______________________________________________________________ > 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 aa...@me.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
