2m Big Wheel 
70cm Big Wheel
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Mounting instructions and
review of MEGAHERTZ magazine (abt. 150 KB)
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The "big wheel" is a horizontally polarized
omnidirectional antenna . Normally, high gain directional antennas are to be used
for VHF or UHF communication, in order to multiply the radiated energy into the desired
direction or get rid of interferences from other than the desired direction. However, the
directional characteristics of a beam antenna is not always an advantage or wanted. For
general coverage purposes, an omni pattern is desirable allowing the operator to scan in
all directions for signals of interest. Normally the beam stays directed into the general
direction of most radio activities and some possible contacts may not be heard. That's
when the Big Wheel comes to play: It's an ideal antenna to be used on top of the high gain
yagi as well as a great omnidirectional antenna for contesting. These
antennas are made of anti-corrosion aluminum material and all nuts and bolts are made of
stainless steel. The gain is approx. 3dBd and the antennas utilize an N-connector. It's
possible to stack two Big Wheels horizontally and thus increase the gain to approx. 5 dBD
onmidirectionally! For correct coupling and tuning of both antennas, it is recommended to
use a phasing line Technical data
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MODEL No. |
2m Big Wheel |
70cm Big Wheel |
| Frequency
(MHz.) |
144-146 |
430-440 |
| Gain
dBd. |
ca. 3 |
| SWR |
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| Max. power
Watts |
500 |
200 |
| Impedance
(Ohm) |
50 |
| Diameter
(Meters) |
ca. 1.2 |
ca. 0.34 |
| Mast dia. max
(mm) |
65 |
50 |
| Weight
(kgs) |
0,7 |
0,3 |
| Stacking distance
(mm) |
1300 |
430 |
| Order no.
of phasing line for stacking |
BIG2STK |
BIG70STK |
| Connector |
N jack |
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