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
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