MY DOUBLE BOOM YAGI (TWINBOOM) ANTENNAS FOR 1296 MHZ

 

If you have come to this page, I think you have had read all what is said about twinboom antennas for 50, 144 and 432 MHz, so that I need not to repeat it.

What I have to say now is:

The standard values for Earth and Sky temperatures, due to much quieter condition, are much lower than on lower bands. Tearth is taken to be 290K and Tsky 10 K. Therefore,. good performance claimed for twinboom antennas, are spectacularely expressed on the 23 cm band, as you will see.

I have modelled many twinboom antennas for 23 cm band, with different element diameter. Here in the table you will see the antennas with elements of 5 mm diameter only. Smaller diameter offers worse performanse within 0.2 to 0.5 dB. so that I decided not to include them in the list. However, if there is interest for them, just send me an e-mail with your request.

Please, have in mind that radiator of each antenna should be made of 2.5 mm silverplated copper wire. The reason is just to avoid aluminum soldering or welding. Silvered wire is easy to solder and resistant against corrosion. If necessary, I can model antenna with thiner material (1.5 mm, for example, though I do not recommend this).

 

 

 

 

 

TWINBOOM ANTENNAS FOR 1296 MHz YU7XL

 

 

ANTENNA

TYPE

Length

(mm)

Gain

(dBi)

Ta

(K)

Tloss

(K)

G/T

(dB)

F/R

(dB)

1st H

lobe (dB)

1st V

 lobe (dB)

H lobe

(◦)

V lobe

(◦)

Z
(Ώ)

at

1296.1

MHz

 VSWR at
1300 MHz

Δf for SWR=1.5

(MHz)

Lower

Upper

X232005XL4QAG

585

15.90

17.3

3.0

3.53

28.87

23.24

21.63

34.8

27.8

 199.8

1.02:1 

1224.000

1325.000

X232205XL5QAG

685

 16.42

17.1 

3.3 

4.08 

30.07 

22.19 

23.34 

32.8 

26.2 

201.4

1.02:1 

1222.000 

1324.000 

X232405XL5QAG

785

 16.89

16.9 

3.0 

4.69 

30.09 

21.79 

21.64 

31.0 

25.2 

200.8

1.05:1 

1221.000 

1323.000 

X232605XL5QAG

885

 17.29

17.0

3.3 

4.97 

28.52 

21.48 

21.07 

29.6 

24.2 

200.1

1.05:1 

1230.000 

1316.000 

X232805XL5QAG

985

 17.65

16.9 

3.3 

5.36 

31.95 

20.76 

20.41 

28.2 

23.4 

200.4

1.04:1 

1233.000 

1329.000 

X233005XL5QAG

1085

17.98

16.4 

3.3 

5.85 

33.30 

20.01 

19.85 

27.0 

22.6 

200.9

1.03:1 

1240.000 

1329.600 

X233205XL4QAG

1185

18.29 

16.3 

3.3 

6.18 

34.60 

19.18 

18.91 

26.0 

21.8 

199.5

1.05:1 

1239.000 

1330.000 

X233405XL4QAG

1285

 18.56

16.1 

3.3 

6.50 

43.31 

18.76 

18.78 

25,2 

21.2 

200.9

1.02:1 

1231.000 

1330.300 

X233605XL2QAG

1385

 18.80

16.2 

3.6 

6.70 

37.86 

18.04 

18.01 

24.5 

20.6 

198.5

1.01:1 

1238.000 

1330.100 

X233805XL2QAG

1485

 19.05

16.2 

3.6 

6.94 

31.19 

17.62 

18.08 

23.6 

20.2 

200.6

1.03:1 

1224.000 

1331.200 

X234005XL2QAG

1585

19.28 

16.1 

3.6 

7.20 

30.32 

17.15 

17.87 

22.8 

19.6 

199.7

1.05:1 

1225.000 

1331.400 

X234205XL3QAG

1685

 19.50

16.0 

3.6 

7.45 

29.95 

16.63 

17.94 

22.0 

19.2 

200.6

1.07:1 

1225.000 

1331.300 

X234405XL2QAG

1785

19.72

16.0 

3.9 

7.67 

36.86 

15,27 

17.92 

21.2 

18.7 

197.7

1.03:1 

1239.000 

1327.500 

X234605XL3QAG

1885

 19.93

 16.1

3.6 

7.87 

30.35 

15.91 

17.32 

20.6 

18.4 

202.6

1.08:1 

1233.000 

1328.800 

X234805XL2QAG

1985

 20.07

16.0 

3.9 

8.02 

36.09 

14.77 

17.65 

20.2 

18.1 

200.1

1.04:1 

1229.000 

1327.000 

X235005XL3QAG

2085

20.27

15.90 

3.6 

8.25 

40.38 

15.08 

17.39 

19.8 

17.8 

198.6

1.04:1 

1215.000 

1328.000 

X235205XL1QAG

2185

 20.40

16.0 

3.9 

8.35 

36.79 

14.89 

17.72 

19.4 

17.5 

201,2

1.02:1 

1229.000 

1327.000 

X235605XL2QAG

2385

 20.76

16.0 

3.6 

8.71 

38.26 

14.30 

16.93 

18.6

16.6 

198.2

1.05:1 

1209.000 

1329.000 

X236405XL1QAG

2785

 21.26

15.7 

3.9 

9.29 

37.29 

14.96 

17.03 

17.6 

15.8 

199.2

1.04:1 

1230.000 

1326.000 

X236805XL1QAG

2985

21.52

15.6 

3.9 

9.57 

39.31 

14.93 

17.31 

17.0 

15.4 

200,7

1.02:1 

1229.000 

1325.200 

X237405XL1QAG

3285

 21.87

15.6

3.9 

9.92 

38.00 

14.66 

25.48 

16.0

14.8 

199.1

1.04:1 

1229.000 

1325.800 

X237805XL1QAG

3485

 22.10

15.6 

3.9 

10.15 

40.37 

14.92 

17.14 

15.4 

14.4 

201.2

1.04:1 

1230.000 

1326.200 

X238205XL1QAG

3685

 22.31

15.6 

3.9 

10.36 

41.11 

15.42 

17.20 

15.0 

14.0 

200.7

1.03:1 

1230.000 

1324.700 

X238605XL1QAG

3885

22.42

15.6 

3.9 

10.57 

40.17 

15.12 

16.87 

14.6 

13.8 

199.3

1.03:1 

1231.000 

1324.300 

X238805XL1QAG

3895

 22.61

15.6 

3.9 

10.66

50.94 

 14.75

16.77 

14.4 

13.6 

200.6 

1.02:1 

1231.000 

1325.000