5-Ele-18Ohm-Yagi 50 MHz

Construction Details	2-El.-12,5-Ohm (0,40m)	2-El.-28-Ohm (0,60m)
3-El.-12,5-Ohm (1,90m)	3-El.-28-Ohm (1,90m)	3-El.-28-Ohm (2,50m)
4-El-12,5-Ohm (2,90m)	4-El-12,5-Ohm (3,60m)	5-El.-28-Ohm (4,50m)
5-El-12,5-Ohm (6,00m)	5-El-18-Ohm (6,00m)	6-El.-28-Ohm (7,20m)
7-El.-28+50Ohm (9,20+7,75m)	8-El.-28-Ohm (12,30m)	9-El.-28-Ohm (14,00m)
4-El-28-Ohm (2,20m)	5-El-50-Ohm (4,30m) new	6-El-50-Ohm (6m+7,20m) new

5-Element-18-Ohm-Yagi with 6m-Boom

Short data: Gain 9.3dBd, very good F/R >33dB, bandwidth 700KHz (49.8-50.5 MHz) at SWR < 1.5

This Yagi has slightly less gain than the 12,5-Ohm-Yagi, but is not so critical and the pattern is excellent. You can mount the antenna 1,50m above a roof or 2m above other Yagis for shortwave.

The Photo shows the Yagi built by Manfred, DL8FBC.

On the top is a 7-Ele-DK7ZB-Yagi for the 2m-band.

Paco, EA5EF

has a very good solution for the transformation line.

I used 60Ohm-cable (old german type, today not available) 2x parallel.

Paco used 3x93-Ohm-coax RG-62 with good success.

To transform the 18Ohm of the Yagi to the 50 Ohm for the feeding you need a 30Ohm-quarter-wave-line.

The 5-El.-18-Yagi by Paco, EA5EF with the 3x93-Ohm-coax-match

Element	Element-position (mm)	Element-length (mm)
R	0	2995
DE	995	2865
D1	2190	2725
D2	4340	2715
D3	5970	2625