ANTENNA QY20708XL7D2
Good stacking characteristics at small vertical distances and any horizontal distances
PERFORMANCES: (No loss condition)
TYPE / ELE / L (mm) / G (dBi) / F/B (dB) / F/Sh (dBi) / F/Sv (dBi) / Hor (◦) / Ver (◦) / Temp (◦K) / G/T (dB) / ΔF * (kHz)
QY20708XL7D2 / 7 / 2110 / 11.70 / 23.27 / 24.75 / 21.44 / 48.4 / 57.6 / 282.9 / -12.82 / 8600

* ΔF given for SWR=1,5

PERFORMANCES: (Loss included)
Element material / G (dBi) / Temp (◦K) / G/T (dB)
Aluminum rods / 11.67 / 282.9 / -12.85
DIMENSIONS:
Ref / De1 / De2 / D1 / D2 / D3 / DQ1 / DQ2 / REMARKS: -All elements made of Al rods Ǿ8 mm
- The height of the rectangle is 500 mm
- All dimensions given in milimetres
Pos / 0 / 188 / 318 / 405 / 695 / 1035 / 1558 / 2110
Length / 1018 / 1010 / 926 / 932 / 924 / 886 / 524 / 504

Building hints: No boom correction included.

COMPARISON
Antenna / Boomlength (mm) / Material / Gain (dBi) / TA (◦K) / G/T (dB) / Bandwidth
(MHz)
QY20708XL7D2 / 2110 / No loss / 11.70 / 282.9 / -12.82 / 139.000- 147.000
Aluminum / 11.67 / 282.9 / -12.85
EF0206-5 / 2377 / No loss / 11,91 / 283.0 / -12.61 / 140.200 – 145.300
Aluminum / 11.84 / 283.3 / -12.68
G0KSC 6ELE
EU / 2349 / No loss / 12.01 / 272.1 / -12.34 / 141.100 – 145.750
Aluminum / 11.96 / 272.3 / -12.39
DIAGRAMS (no loss included)
DIAGRAMS (loss included)

STACKING
QY20708XL7D2 – STACKING TABLE
(including loss for aluminum – AGT = -0.03 dB)
VERTICAL
DISTANCE (cm) / G
(dB) / TA
(°K) / G/T
(dB) / HORIZONTAL
DISTANCE (cm) / G
(dB) / TA
(°K) / G/T
(dB)
100 / 13.35 / 235.5 / -10.37 / 100
110 / 13.50 / 231.9 / -10.15 / 110
120 / 13.64 / 230.0 / -9.98 / 120 / 13.19 / 275.8 / -11.22
130 / 13.76 / 229.6 / -9.85 / 130 / 13.36 / 273.4 / -11.01
140 / 13.87 / 229.6 / -9.74 / 140 / 13.52 / 272.5 / -10.83
150 / 13.98 / 228.6 / -9.61 / 150 / 13.66 / 272.9 / -10.70
160 / 14.09 / 227.5 / -9.48 / 160 / 13.78 / 274.1 / -10.60
170 / 14.19 / 227.7 / -9.38 / 170 / 13.90 / 275.9 / -10.51
180 / 14.28 / 229.4 / -9.33 / 180 / 14.01 / 278.0 / -10.43
190 / 14.37 / 232.3 / -9.29 / 190 / 14.12 / 280.2 / -10.35
200 / 14.46 / 236.1 / -9.27 / 200 / 14.22 / 282.2 / -10.29
210 / 14.54 / 241.3 / -9.29 / 210 / 14.31 / 284.1 / -10.22
220 / 14.61 / 247.9 / -9.33 / 220 / 14.39 / 285.5 / -10.17
230 / 14.66 / 255.7 / -9.42 / 230 / 14.47 / 286.6 / -10.10
240 / 14.70 / 264.1 / -9.52 / 240 / 14.53 / 287.3 / -10.05
250 / 14.73 / 272.9 / -9.63 / 250 / 14.58 / 287.7 / -10.01
260 / 260 / 14.63 / 287.9 / -9.96
270 / 14.66 / 287.7 / -9.93
280 / 14.69 / 287.4 / -9.89
290 / 14.71 / 286.9 / -9.87
300 / 14.73 / 286.3 / -9.84
310 / 14.73 / 285.7 / -9.83
320 / 14.74 / 285.0 / -9.81
330 / 14.74 / 284.4 / -9.80
FOUR ANTENNAS IN H STACK

Recommended stacking distances: 310 cm horizontally and 187 cm vertically

Antenna / Stacking distance / Material / Gain
(dBi) / TA
(◦K) / G/T
(dB)
Horizontally / Vertically
QY20705XL7D2 / 310 cm / 187 cm / No loss / 17.50 / 228.7 / -6.09
Aluminum / 17.47 / 229.3 / -6.13
X POL VERSION

Horizontal components: Same as above

Vertical components: Same as above, except:

·  All vertical yagi elements positioned 20 mm back regarding horizontals.

·  All crossed elements must cross each other in their centerlines

HORIZONTAL PERFORMANCES

Everything as the above data

VERTICAL PERFORMANCES with no corrections

Loss included condition (for Aluminum)

VERTICAL PERFORMANCES after corrections

If you want to get better SWR diagram for vertical antenna you can do the following:

·  To change position of D1 for +3 mm

·  To change length od DE2 from 926 to 938 mm

In this case the SWR diagram will be like this:

XPOL PERFORMANCES
VERTICAL COMPONENT / Material / G (dB) / TA (°K) / G/T (dB)
No loss / 11.63 / 267.3 / -12.64
Aluminum / 11.60 / 267.5 / -12.67