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UR5LCV’s YAGI for Hams



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ANTENTOP- 01- 2004, # 005 UR5LCV’s YAGI for Hams

 

 

 

Antennas from here were designed and optimized by Igor Zel'din, UR5LCV, and design of the antennas were wrote in the book: HF- Antennas- 3, by I. Beketov, UR4LTX, I. Zel'din, UR5LCV, Kharkov, 1994.

 

10 years has gone from the publishing of the book, for this time lots of these antennas became well- known to hams of the CIS. Lots of these antennas are practically made and have shown full conformity to the theoretical parameters.

 

 

The antennas are designed for tubes of 25-mm diameter. If for tubes with different OD are used for elements of antennas do correcting of antenna sizes by modern Antenna Simulation Program. Input resistance of the antenna is much lower the 50 Ohms so it need to use a gamma match feed the antenna. You may calculate a gamma match using programs given at Appendix to ARRL-Antenna Book, 19 or 20 Edition.

 

4-el YAGI for 28-MHz

F, MHz

28.0

28.35

28.7

G, dBd

7.16

7.49

7.87

F/B, dB

20.35

28.36

20.27

Z, Ohm

30.4-j7

26.4+j1.6

20.4+j.14.3

SWR

1:1.63

1:1.14

1:1.6

 

OD 25-mm

Reflector

Driver

Director 1

Director 2

Length, cm

535

503

479

448

Spacing to

Reflector, cm

0

168

368

683

 

 

 

 

 

http://www.antentop.org/

Page 47

 

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Last Updated:

August 7, 2016 20:25

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