ANTENTOP- 01- 2018 # 022

Broadband 50- MHz Antenna

So the antenna was assembled on the net for flowers. Antenna wires were taken in 10 cm longer then simulated by MMANA. It allowed do tuning of the antenna. I did not cut the wires. Horizontal wires were formed in a small roll the slope wires were adjusted in length on the end insulators.

The tuning was very simple. I use my trusty MFJ-259B. Shortened the wires, check the SWR shortened or lengthened the wires again...

If you want you may simulate the tuning in MMANA to understand what part of the antenna wires you need shortened/ lengthened. However the practical way as well gives good result. I tried reach SWR 1:1 at the 51.0 MHz. However you may move the SWR in any frequency band you want. Table 1 shows SWR in the antenna. SWR was measured by SWR- meter of the IC- 7410 the same data were showed by JANA HJ- 8017A SWR meter.

Table 1

SWR of the 50- MHz antenna

SWR was measured by SWR- meter of the IC- 7410. The same data were showed by SWR meter JANA HJ- 8017A. Coaxial cable from transceiver to the antenna has 8 meter length.

Antenna was tested with ICOM- 7410. The antenna shows near 2- S units over quarter wave vertical antenna (http://www.antentop.org/022/Low_profile_022.htm). The antenna gives strong receiving of VE3UBL 50- MHz beacon located at 30 km away from me. With help of the antenna I have received lots US 50- MHz beacons I made local QSOs and QSOs with USA stations.

So the antenna works well it is easy to build and to tune. I may recommend try the antenna to those who want use the 50- MHz band.

73! de VA3ZNW

Photo 7 Insulator at the end of a slope wire

Photo 6 Roll of wires in horizontal wire

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