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ANTENTOP- 01- 2013 # 017

Antennas UA6AGW

 

 

SWR of the antenna was less 2.0:1.0 at the pass band 100- kHz. In the vertical plane Antenna has DD similar to an ellipse with a maximum in the radiation along the horizontal wires. Vertical plane radiation is going at the angle near 25- degree. In the horizontal plane the antenna has almost circular DD.

 

Tuning of the Antennas

 

Tuning of the antennas is very simple. Firstly, set the capacity of the capacitor C1. Capacity should be 20 23- pF for antenna for 40- meter Band or 37 40- pF for antenna for 80- meter Band. Then turn on the coaxial cable to transceiver. Antenna is tuned up to the resonance with help of capacitor C2.

 

Figure 7 Plastic box with Capacitors

 

Figure 8 Preparation of the Coupling Loop for the Antenna UA6AGW for the 80-m Band

(Dimensions in mm)

 

 

It may be done either in the receiving mode- just tune the C2 on to maximum receiving signals, or in the transmitting mode- just tune the C2 on to minimum SWR. It is possible to tune the antenna with the help of a FSM (Field Strength Meter). Maximum reading the FSM is matched to the minimum SWR.

 

Test of the antennas

 

The antennas were installed at my cottage where I was not so often in the Air to be enough to get an objectively judgement about the performance of the antennas. Antenna for the 40- meter Band was used to me often compare to antenna for the 80- meter Band.

 

 

 

 

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May 1, 2016 23:07

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