ANTENTOP- 01- 2016 # 020

UA6AGW Antenna V. 20-10.51 (14.0- 29.5- MHz)

At third, to fasten with help of the cable ties the coupling loop to the antenna loop at the distance of 4- 5- cm from the point of symmetry of the antenna loop.

Tuning and Adjusting

Antenna is tuned to the working band with help of C2. When horizontal wires are fully inserted (length is near 1.6- meter) the antenna should tune with help of C2 to the range of 18.0- 29.0- MHz.

When horizontal wires are fully opened (length is near 3.0- meter) and additional capacitor (length of coaxial cable) is connected to bridge to C2 the antenna should tune with help of C2 to the range of 14.0- 18.0- MHz.

Figure 10 Control Box

Antenna may be tuned to the working frequency by minima SWR or maxima reception. As usual SWR is not exceeded 1.5:1:0 at any band of operation of the antenna. Sometimes changing form of the coupling loop (from circular to oval) may help tune the antenna fine into resonance across the used bands.

When antenna is tuned and the data for servo motor for every band is obtained and wrote down at the servo tester the next re- tuning of the antenna is a very simply. Just put the data to the servo tester press the control knob and servo motor will tune the antenna.

Figure 11 Preparation of the Coaxial Cable for Coupling Loop

(Please, read carefully instruction to the servo motor and servo tester how they are working together.)

UA6AGW Antenna V. 20-10.51 is broadband. When antenna is tuned to the center of the ham band (SWR is not exceeded 1.5:1:0) the SWR at the edges of the band is not exceeded 2.0:1:0. However sometimes at the 10- meter band it may be required fine tuning of the C2 at the edges of the band.

Test of the UA6AGW Antenna V. 20-10.51

Antenna was tested at all working bands. Especially attention was brought at the 20 meter Band.

Antenna showed very high efficiency. DD of the antenna in the horizontal plane is almost circular. Difference in DD across and along the horizontal wire is near 3- dB. There were made lots QSOs with the antenna. Diploma POBEDA (Reference 5) was made in three evening on the 20- meter Band with the antenna.

References:

1.     Antentop 01 203, Antentop 01 2014, Antentop 01 2015

2.     http://www.quad.ru/production/tube.php

3.     https://www.servocity.com/html/hs-311_standard.html#.V4w92KhzaNI

4.     http://ru.aliexpress.com/store/product/HJ-Digital-Servo-Tester-ESC-Consistency-Tester-for-RC-Helicopter-4-8v-6v/912559_1872459794.html?storeId=912559

5.     http://py2nl.blogspot.ca/2015/04/memorial-diploma-pobeda-70-victory-70.html

www.antentop.org

Page- 49