OK3TDC DX antenna for 80- meter band was widely known in
the former USSR. The antenna was published in Amaterske
Radio magazine (former Chechoslovakia
Republic, Reference 1). Figure 1 shows design of the
antenna. The antenna is a loop of 40-
(lambda/2 for the 80- meter band) installed on a wooden
mast in height of near 15 meters. The antenna is fed by 75- Ohm
coaxial cable through a delta matching loop that is shown on the
Figure 1 at the bottom of the
antenna. Antenna has SWR not more then 1.5:1 at all 80- meter
band. I did not found strictly sizes for the delta matching loop.
Antenna required several lambda/4 counterpoises
UA3GFR used the antenna for the 20- meter band. Figure 2
shows design of the antenna (Reference 2).
The antenna was fed through 50- Ohm coaxial cable Matching of
the antenna with the cable was made by changing length of the
antenna wire and shape of the antenna.
In both cases, for 80 and for 20- meter band, the two antennas
have showed excellent performance.
Dancik DX antena pre 3,5 MHz.- Amaterske Radio, № 5, 1977, pp.: 194- 195.
Radio- Dizain # 24, p.: 83- 84.