Details | 2-El.-4m-Yagi | 3-El.-4m-Yagi | 4-El.-4m-Yagi (12.5+50Ohm) |
5-El.-4m-Yagi (28+50 Ohm) | 6-El.-4m-Yagi | 7-El.-4m-Yagi (28+50 Ohm) | 9-El.-4m-Yagi |
Three different Yagis for 70 MHz
Type 1: 3-El.-18-Ohm-DK7ZB-Yagi
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3-El-18-Ohm-Yagi Boom 1,55 m Gain 6,55 dBd F/B 17,5 dBd Broadband Design |
The SWR with 12 m RG213 |
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The match is made with two quarterwave pieces of 50-
and 75-Ohm-cable in parallel. For details see table below.
Here it is RG58 and RG59 |
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Coax cables for the 18-/50-Ohm-DK7ZB-Match
Cable length (screen) |
Coaxcables |
VF |
715 mm | RG58 + RG59 | 0,66 |
875 mm |
Aircell5 + CATV |
0,82 |
You can use 10-mm-elements or a piece of 300 mm 11,5x1,5-mm-tube with tips of 8-mm-tubes
(second lengths in the table)
|
Element-position |
Element-length (10mm) |
Element-length (11,5+8 mm) |
Reflector |
0 mm | 2142 mm | 2164 mm |
Radiator |
600 mm |
2038 mm |
2065 mm |
Director |
1535 mm |
1874 mm |
1907 mm |
Type 2: 3-El.-28-Ohm-DK7ZB-Yagi, 70MHz
|
Gain 5.7dBd F/B 27dB Boom 1,35 m Broadband design Narrowband design see down |
|
Element-position |
Element-length (10mm) |
Element-length (12mm) |
Reflector |
0mm |
2154mm |
2150mm |
Radiator |
660mm |
2026mm |
2020mm |
Director |
1320mm |
1890mm |
1880mm |
Type 3: 3-El.-12,5-Ohm-DK7ZB-Yagi, 70MHz
|
Gain 6,3dBd F/B 19dB Boom 1,35m Narrowband design |
|
Element-position |
Element-length (10mm) |
Reflector |
0mm |
2120mm |
Radiator |
430mm |
2006mm |
Director |
1330mm |
1886mm |