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The pattern is freespace-simulation without
the H-frame at a stacking distance
of 1 wl in both planes.
front/back ratio
impendance
Besides my own opinion that the G/T is only the half truth this are the datas regarding to the VE7BQH charts:
Note in contrast to the most antennas of VE7BQH charts the datas are only a little bit shifting on a bandwith of more than 2 MHz.
Here you can see, what can happen with gain-pimped or overpimped yagies for 144MHz with just water on it...imagine what will
happen with snow and ice...
| f(MHZ) |
GAIN(dBd) |
Ga(dBd) |
Tloss(K) |
Ta(K) |
Tside(K) |
Tback(K) |
G/T |
| 143.8 |
11.02 |
16.0 |
5.1 |
216.3 |
11.5 |
2.1 |
-4.6 |
| 144.0 |
11.05 |
16.0 |
5.4 |
215.3 |
11.3 |
2.1 |
-4.6 |
| 144.0 |
11.05 |
16.0 |
5.4 |
215.3 |
11.3 |
1.5 |
-4.6 |
| 144.2 |
11.09 |
16.0 |
5.7 |
214.5 |
10.1 |
1.1 |
-4.5 |
| 144.6 |
11.14 |
16.0 |
6.0 |
213.5 |
10.0 |
1.0 |
-4.5 |
| 144.9 |
11.19 |
16.0 |
6.1 |
213.4 |
9.2 |
1.4 |
-4.5 |
| 145.2 |
11.16 |
16.0 |
6.1 |
213.9 |
8.8 |
2.3 |
-4.5 |
| 145.5 |
11.15 |
16.0 |
6.2 |
215.0 |
8.7 |
3.7 |
-4.5 |
| 145.8 |
11.12 |
16.0 |
6.7 |
216.9 |
8.9 |
5.3 |
-4.5 |
gain
swv bandwith
My 4 x 8 element
This antenna was in use from 2007 to 2010
in JO61WB and JO60UX with good results.
I understacked the antennas to avoid noise and TVI.
List of EME-QSOs worked with this antenna
Testing the H-frame at home in the garden in summer 2006.
previous QTH JO61WB
