ANTENNA X21808XL3Q
PERFORMANCES:
|
No of ele |
L (mm) |
G (dBi) |
F/B (dB) |
F/Sh (dBi) |
F/Sv (dBi) |
Hor (◦) |
Ver (◦) |
Temp (◦K) |
G/T (dB) |
Tlos (K) |
|
18 |
4365 |
15.51 |
29.31 |
26.40 |
16.40 |
36.4 |
29.2 |
222.9 |
-7.97 |
3.9 |
WORKING CONDITION:
|
Frequency for SWR=1.5 (MHz) |
Z (Ώ) at 144.100 MHz |
SWR at 145.000 MHz |
||
|
Lowest |
Highest |
Bandwidth |
||
|
141.500 |
147.700 |
6.200 |
200.5 |
1.05:1 |
DIMENSIONS:
|
|
Ref |
De |
D1 |
D2 |
D3 |
D4 |
D5 |
D6 |
D7 |
D8 |
Dimensions given in milimetres Diameter of elements 8 milimetres No boom correction included.
|
|
Pos |
0 |
235 |
409 |
784 |
1212 |
1704 |
2326 |
3018 |
3726 |
4365 |
|
|
Length |
1010 |
792 |
925 |
925 |
921 |
907 |
895 |
891 |
887 |
871 |
|
|
Height |
0 |
±230 |
±225 |
±385 |
±515 |
±615 |
±695 |
±735 |
±735 |
±715 |
CONSTRUCTION OF RADIATOR
H = 792
V = 230
Ø= 8 mm
COMPARISON (inserted in a part of VE7BQH table, where it belongs according to its boom length)
|
TYPE OF ANTENNA |
SINGLE ANTENA |
FOUR ANTENNAS IN H-STACK |
||||||||
|
L (λ) |
GAIN (dBd) |
Z (ohms) |
VSWR Bandwidth |
E (m) |
H (m) |
Ga (dBd) |
Tlos (K) |
Ta (K) |
G/T (dB) |
|
|
G0KSC 9OWA |
2.09 |
11.99 |
49.1 |
1.30:1 |
3.33 |
3.04 |
17.96 |
4.9 |
247.0 |
-3.82 |
|
X21808XL3Q |
2.10 |
13.36 |
200.5 |
1.05:1 |
4.00 |
4.40 |
21.58 |
3.9 |
222.0 |
-1.89 |
|
RA3AQ 9S |
2.12 |
12.04 |
47.1 |
1.08:1 |
3.35 |
3.06 |
18.02 |
4.7 |
246.5 |
-3.75 |
|
M2 9SSB |
2.12 |
11.96 |
200.6 |
1.26:1 |
3.33 |
3.04 |
17.92 |
10.8 |
245.9 |
-3.84 |
|
WiMo WX220 XPOL |
2.13 |
11.23 |
202.0 |
1.08:1 |
2.94 |
2.94 |
17.44 |
8.4 |
300.8 |
-5.19 |
|
Gulf Alpha 9 |
2.13 |
11.62 |
203.3 |
1.15:1 |
3.26 |
2.97 |
17.64 |
4.6 |
266.2 |
-4.46 |
|
Gulf Alpha 9 XPOL |
2.13 |
11.60 |
203.9 |
1.15:1 |
3.12 |
3.12 |
17.62 |
5.0 |
267.6 |
-4.50 |
|
DJ9BV 2.1 |
2.13 |
11.89 |
44.9 |
1.30:1 |
3.33 |
3.04 |
17.87 |
5.8 |
255.2 |
-4.05 |
|
G0KSC 9LFA |
2.14 |
11.97 |
50.5 |
1.08:1 |
3.26 |
2.94 |
17.88 |
5.2 |
235.1 |
-3.68 |
|
OZ5HF 9 |
2.16 |
11.52 |
38.0 |
1.15:1 |
3.21 |
2.92 |
17.47 |
3.0 |
272.6 |
-4.74 |
|
YU7EF 9 |
2.16 |
11.84 |
49.8 |
1.17:1 |
3.20 |
2.89 |
17.74 |
5.3 |
236.6 |
-3.84 |
|
Z(ohms) - measured on 144.100 MHz Bandwidth – VSWR measured on 145.000 MHz |
DIAGRAMS (no loss included)
SWR DIAGRAMS (loss included for Al)
BEST DISTANCES FOR STACK
Four antennas in H-stack
|
Horizontal distance (mm) |
Vertical distance (mm) |
G (dBi) |
TA (K) |
G/T (dB) |
Tlos (K) |
Remark |
|
3330 |
4127 |
21.42 |
222.8 |
-2.06 |
3.9 |
Per DL6WU formula |
|
4000 |
4400 |
21.58 |
222.0 |
-1.89 |
3.9 |
For max G/T |
|
3780 |
4200 |
21.54 |
221.2 |
-1.91 |
3.9 |
For lowest temperature |
Four antennas in H-stack, H=3.90 V=4.40 metres
Eight antennas in stack (four in horizontal and two in vertical plane)
|
Horizontal distance (mm) |
Vertical distance (mm) |
G (dBi) |
TA (K) |
G/T (dB) |
Tlos (K) |
|
4000 |
4400 |
24.61 |
221.5 |
+1.15 |
3.9 |
Sixteen antennas (four in horizontal and four antennas in vertical plane)
|
Horizontal distance (mm) |
Vertical distance (mm) |
G (dBi) |
TA (K) |
G/T (dB) |
Tlos (K) |
|
4000 |
4400 |
27.61 |
224.9 |
+4.09 |
3.9 |
SIXTEEN ANTENNAS AT H=4.00+4.00+4.00 AND V=4.40+4.40+4.40 METRES - DIAGRAMS
