ANTENNA X21408XL4Q
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) |
|
14 |
2945 |
14.20 |
34.09 |
- |
16.59 |
41.8 |
34.2 |
224.5 |
-9.32 |
3.6 |
WORKING CONDITION:
|
Frequency for SWR=1.5 (MHz) |
Z (Ώ) at 144.100 MHz |
SWR at 145.000 MHz |
||
|
Lowest |
Highest |
Bandwidth |
||
|
139.400 |
147.100 |
7.700 |
197.6 |
1.07:1 |
DIMENSIONS:
|
|
Ref |
De |
D1 |
D2 |
D3 |
D4 |
D5 |
D6 |
Dimensions given in milimetres Diameter of elements 8 milimetres No boom correction included.
|
|
Pos |
0 |
269 |
438 |
819 |
1252 |
1722 |
2408 |
2945 |
|
|
Length |
1016 |
798 |
933 |
923 |
929 |
907 |
903 |
885 |
|
|
Height |
0 |
±230 |
±235 |
±395 |
±525 |
±615 |
±655 |
±655 |
CONSTRUCTION OF RADIATOR
H = 798
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 7LFA |
1.39 |
10.62 |
48.0 |
1.19:1 |
2.84 |
2.49 |
16.53 |
1.8 |
248.9 |
-5.28 |
|
X21208XL4Q |
1.41 |
12.05 |
197.6 |
1.07:1 |
3.80 |
3.80 |
18.17 |
3.6 |
224.7 |
-3.20 |
|
DG7YBN 7 |
1.44 |
10.59 |
47.2 |
1.70:1 |
2.88 |
2.47 |
16.55 |
4.5 |
242.7 |
-5.15 |
|
Vine 7 FD |
1.45 |
10.56 |
47.9 |
1.14:1 |
2.83 |
2.46 |
16.47 |
8.2 |
238.6 |
-5.16 |
|
G4CQM 7 |
1.50 |
10.76 |
50.7 |
2.31:1 |
2.89 |
2.53 |
16.69 |
7.9 |
239.9 |
-4.96 |
|
CT1FFU 7 |
1.54 |
10.82 |
28.0 |
1.02:1 |
2.87 |
2.50 |
16.70 |
2.8 |
237.7 |
-4.96 |
|
DK7ZB 7 |
1.57 |
11.11 |
28.4 |
1.64:1 |
3.16 |
2.84 |
17.13 |
5.8 |
272.6 |
-5.07 |
|
IK0BZY 6 |
1.63 |
11.11 |
19.5 |
2.27:1 |
3.10 |
2.77 |
17.04 |
4.8 |
266.5 |
-5.07 |
|
Z(ohms) - measured on 144.100 MHz Bandwidth – VSWR measured on 145.000 MHz |
||||||||||
DIAGRAMS (no loss included)
SWR DIAGRAMS (loss included for Al)
STACKING
|
Horizontal distance (cm) |
G (dBi) |
TA (K) |
G/T (dB) |
Vertical distance (cm) |
G (dBi) |
TA (K) |
G/T (dB) |
|
100 |
|
|
|
100 |
|
|
|
|
110 |
|
|
|
110 |
|
|
|
|
120 |
15.37 |
217.9 |
-8.06 |
120 |
|
|
|
|
130 |
15.56 |
216.6 |
-7.84 |
130 |
|
|
|
|
140 |
15.72 |
216.4 |
-7.68 |
140 |
|
|
|
|
150 |
15.86 |
217.0 |
-7.55 |
150 |
|
|
|
|
160 |
|
|
|
160 |
|
|
|
|
170 |
|
|
|
170 |
|
|
|
|
180 |
|
|
|
180 |
|
|
|
|
190 |
|
|
|
190 |
|
|
|
|
200 |
16.39 |
225.6 |
-7.18 |
200 |
16.00 |
245.3 |
-7.92 |
|
210 |
|
|
|
210 |
|
|
|
|
220 |
|
|
|
220 |
16.27 |
234.9 |
-7.47 |
|
230 |
|
|
|
230 |
16.35 |
232.9 |
-7.36 |
|
240 |
|
|
|
240 |
16.41 |
231.2 |
-7.27 |
|
250 |
16.78 |
230.4 |
-6.88 |
250 |
16.48 |
229.9 |
-7.17 |
|
260 |
16.84 |
230.2 |
-6.82 |
260 |
16.55 |
230.2 |
-7.11 |
|
270 |
16.90 |
229.8 |
-6.75 |
270 |
16.60 |
232.3 |
-7.09 |
|
280 |
16.95 |
229.1 |
-6.69 |
280 |
|
|
|
|
290 |
16.99 |
228.2 |
-6.63 |
290 |
|
|
|
|
300 |
17.03 |
227.3 |
-6.57 |
300 |
16.76 |
236.8 |
-7.01 |
|
310 |
17.07 |
226.3 |
-6.52 |
310 |
16.82 |
234.8 |
-6.92 |
|
320 |
17.09 |
225.3 |
-6.48 |
320 |
16.89 |
232.1 |
-6.80 |
|
330 |
17.11 |
224.4 |
-6.44 |
330 |
16.96 |
229.3 |
-6.68 |
|
340 |
17.13 |
233.6 |
-6.40 |
340 |
17.03 |
227.1 |
-6.57 |
|
350 |
17.15 |
222.9 |
-6.37 |
350 |
17.08 |
225.6 |
-6.49 |
|
360 |
17.15 |
222.4 |
-6.36 |
360 |
17.12 |
224.8 |
-6.44 |
|
370 |
17.16 |
222.1 |
-6.35 |
370 |
17.16 |
224.7 |
-6.40 |
|
380 |
17.16 |
222.1 |
-6.35 |
380 |
17.18 |
225.2 |
-6.39 |
|
|
17.16 |
222.2 |
-6.35 |
390 |
17.19 |
226.0 |
-6.39 |
*The Table is presented without KF2YN convergence correction applied and serves only to show which distance can be used with good result, and which distances should be avoided. In H-stack it can be slightly changed.
*Yellow coloured – good distances
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 |
|
2916 |
3538 |
20.10 |
231.6 |
-3.55 |
3.6 |
Per DL6WU formula |
|
3800 |
3800 |
20.32 |
224.7 |
-3.20 |
3.6 |
For max G/T |
|
1440 |
3700 |
18.92 |
214.9 |
-4.41 |
3.6 |
For lowest temperature |
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) |
|
3800 |
3800 |
23.35 |
223.2 |
-0.14 |
3.6 |
Eight antennas in stack two in horizontal and four in vertical plane)
|
Horizontal distance (mm) |
Vertical distance (mm) |
G (dBi) |
TA (K) |
G/T (dB) |
Tlos (K) |
|
3800 |
3800 |
23.36 |
228.9 |
-0.24 |
3.6 |
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) |
|
3800 |
3800 |
26.38 |
227.6 |
+2.81 |
3.6 |
