|
optimum short-wave antennas
Simply the best wire beam for a small permanent installation
or the DX-Peditioner.
The
very special wire beam
Opti Wire Beam
small
- light - in obtrusive - but as strong as an ox
 |
maximum performance by a modern computer
optimized design |
|
optimum element order and element positioning |
|
integration of powerful Moxon structures |
|
use of the special and loss free OptiBeam
multiband driver feed system |
|
Mechanically
stable, no cheap and ugly "wire mess" |
|
Only
the best materials are used for quality |
|
use
of many carefully planned machine worked precision parts |
|
Unique
design for a robust and optically attractive frame |
|
assembly
within 1 hour,
no annoying tuning, no fiddling around |
|
all elements are completely prepared (no
fussing
with a roll of wire) |
|
all elements are pre installed in the center
|
|
total pre assembly of all
components |
|
perfect pre adjustment of the
entire truss system |
|
the
ultimate solution for
limited space, a critical neighbourhood, and for portable use !!! |
Here is a diagram of the Unique Moxon elements
and the interlaced straight elements. Pure simple genius! The Opti Wire OptiBeam.
Think it won't work?
This baby is already working!
See the plots and VSWR curves by downloading
this file OPTIPLOTS pdf format
. The measured values are even better
Learn more about it from the
OPTIBEAM Website
MONOBANDERS for 20,15,10,
and 6 meters
OptiBeam High
Performance Monobander for 6, 10, 15 und 20m
For
several years OptiBeam is well known for its special multiband Yagis
and
its monoband Yagis for 30, 40 and 80m, shortened by high Q air coils. They all
distinguish by best electrical performance and excellent mechanics.
Now they are able to provide their well known mechanical and electrical
performance in these great monoband antennas.
Unlike the other OptibBeam multiband antennas
which are
aimed at
diversity
they
have specialised on one model/design
for each band which shows an extraordinary electrical performance and which
mechanically is realised extremely robust.
OptiBeams
analysis
proves that a long boom 5 element design is the winner concerning electrical
efficiency (combined with mechanical robustness).
The difference in performance of the 5 element desing
compared to a
4 element Yagi is
a
well
noticeable (1 to 1.5 dBd additional gain plus much better radiation pattern)
whereas the step towards a 6 element monobander barely can be registered (just
0.3 to 0.5 dBd additional gain but achieved
by a large increase in
boom length.
The OptiBeam monobanders for 6, 10, 15 und 20m are designed for
the demanding contest stations and for
operators
with especially high requirements.
Optibeam utilizes
modern 5
element computer optimised OWA designs,
where the
first director
is
located relatively close to
the driven element to match the system to 50 ohms directly
without the need for a matching device.
They
are
distinguish by the following electrical and mechanical
parameters:
Electrical
Specifications
|
the driven element, second and third director
wide spaced) |
|
boom length 0.71 lambda |
|
gain about
8.5 dBd |
|
f/b 25 to 30 dB |
|
gain and radiation pattern nearly constant
across the entire frequency range |
|
extremely flat SWR curve across the entire band |
|
50 Ohm direct fed without the requirement of
matching mechanisms |
|
perfectly stackable in distances from 0.6
up to 1.2 lambda |
Mechanical
Specifications
|
Use of large tapered
round booms for 20,15,and 10 meter antennas |
|
Use of a square boom
on the 6 meter antenna |
|
160 km/h (above 100 mp/h)
survivablity with heavy duty elements. For instance the tube |
diameters at the centers start at :
- 20m = 35mm
(1.378 inches)
- 15m = 25mm
( 1 inch)
- 10m = 20mm
( .8 inch)
- 6m = 16mm
(.63 inch)
|
Special
ribbed
stainless steel U-bolt cradles.
to keep the elements flat
even under most severe
conditions
as well as the boom
to mast clamp. |
|
All
hardware
is
stainless steel |
Click on the links below to see the products and take a tour of
the quality in all of the OptiBeam antennas:
The latest in high performance multi-band Yagis without any
compromises!
Be sure to see the full line up of these unique new antennas.
What is an
OptiBeam?
Jim Fogarty, K2YU - OB6B+ System from
Optibeam may be the best system possible for 6 bands on a telescoping
tower.
Another look at the OB6B+ system It has the following:
Bands - elements
40
2
20
3
17
3
15
4
12
4 (use of
the 10m directors)
10
4 |
| |
This antenna is by far the best Triband antenna I have ever owned. I am anxious to add the OB7-2 WARC antenna to round out the
system.
For those of you who saw the antennas at Dayton, there is no need to mention the very fine HD construction and first rate craftsmanship
that goes into these antennas. For me as a first time purchaser, sight unseen, the quality of construction was very impressive and best of
all the antenna is very easy to assemble. no measuring required. All hardware is stainless steel and all boom and element connections
are bolted...no self tapping screws or hose clamps to fool with. The element length positions are predrilled. Just for kicks, I measured the
element sections after assembly and all were exactly as shown on the simple, easy to follow, assembly manual. For the faint of heart
though it should be noted that this antenna is not easy to manhandle! A crane was used to lift the approximately 100lb finished weight
beast to the top of a 70ft tower. Oh yes, I should mention the antenna seems to be very well balanced also as we picked the antenna and
mast up at the boom/mast mounting bracket and it never deviated from level while being lifted by the crane.
This is the first antenna I have ever owned that was an immediate 'hit' with the Alpha 87A. SWR levels are below what was advertised..at
least here on my installation which is mounted on a 70ft Rohn 45 tower all by itself.
Worst case SWR readings here was 1:3:1 on the CW end of 20 meters and never above 1:2:1 at any other point on the 20/15/10 meter
bands! I used the center drilled holes on the driven elements but this antenna can be tuned to favor the CW or Phone ends of the bands by
utilizing either of the other predrilled driven element holes.
I should also mention this is a single feedline antenna using a patented feed system to
separate full size driven elements.
For the short time I have owned this antenna, the performance and electrical claims of the manufacturer have all been met or exceeded.
Actual on air reports and tests have been very encouraging and I don't come away with any feelings of
disappointment. Now we will have to wait and see what the tests of Winter (and contesting) bring!
73 de K1UO
Larry
|
|
The OB12-6 arrived at the airport in one
very large box. It was no problem for my pickup truck. Jay at Array
Solutions had it drop shipped directly to me. It remained in my garage for
the next several weeks while the tower was completed. I unpacked it on a
Saturday afternoon and assembled the boom – three-inch square aluminum.
The splice joints on the boom sections are aluminum bar with heavy
stainless nuts bolts and washers.
The quality of this antenna immediately
became apparent as assembly progressed. There are many subassemblies
already put together (what a delight). The boom section was marked for
each of the twelve elements, no measuring. Every piece of hardware is
stainless steel right down to the turnbuckles on the boom truss. Nylock
stainless steel nuts are use throughout. The assembly was done in about a
day – not bad for an antenna this big and complex.
I never used a file, drill, saw, tap or
reamer. The fit and finish was flawless and I didn’t have to struggle with
any part of the assembly. Tom (DF2BlueOcean)
is really a master electro-mechanical designer / builder.
I placed the antenna at twenty-five meters
elevation on the tower. On the air has been very remarkable. Perfect SWR
better then advertised. The antennas been up only a few days but it’s
pointing, front-to-back and side, seem excellent. My last large beam
(KT34XA) never seemed to get that quite right. So far this has been a very
positive and impressive experience and congratulations to OptiBeam and
Array Solutions for outstanding quality and service.
de
wb1s
|
An Optibeam is.....................Antenna-Technology
OptiBeam-Multiband-Antennas are
optimized by use of modern computer simulation tools and checked in the
field.
Critical tests in practice including final optimizations guarantee highest electrical and mechanical performance.
An Optibeam is...............TECHNICAL QUALITIES
OptiBeam-Multiband-Antennas are distinguished by the following technical qualities:
1. Use of the new "direct coupled feed system" *
2. Each band has its own, fully resonant driven element
3. Special order in the placement of the elements
4. Use of full-size elements only.
* protected by patent
An Optibeam is.................Electrical Properties
Optimal performance is achieved by the following electrical properties:
-
Highest efficiency
-
Optimum band coverage which means nearly constant gain,
and pattern and low VSWR.
-
Direct 50 Ohms at the feedpoint with all driven
elements fed using a single feedline.
-
Constancy of the characteristics under all weather-conditions
-
High power handling capable
-
Choice of high power Baluns
-
Real RF Insulators large RF
conductors,
excellent machined parts which allow perfect electrical contact over time.
An Optibeam is ..............Mechanical Quality
throughout
OptiBeam-Multiband-Antennas are furthermore distinguish by the following mechanical qualities:
-
Specially configured, stable and German machined element
brackets with real RF insulators
-
Slender but strong and stable square-booms
-
Perfectly fitting element sections and the use of
stainless steel hardware
-
Clamps of highest quality, value, and machining
excellence.
An Optibeam is................Physical Properties
By these technical qualities special physical properties are achieved:
-
High stability of the entire system
-
Elements perfectly aligned and secured against twisting
-
Minimal element droop
-
They just plain look great! Even your neighbor
may like it!
An Optibeam is:...........Avoiding disadvantages of other
antenna systems
OptiBeam-Multiband-Antennas avoids the disadvantages of other common multi-band
antenna systems:
Trap antennas have losses, noticeable reduced band coverage, reduction of efficiency
over the years and limited power-handling
capabilities.
Log-Periodic antennas - acceptable gain is only achieved on longer booms and unwanted
harmonics are radiated.
Quads and other wire antennas tend to have losses because of their thin
wire elements
and they don't show an optimum band
coverage.
Antennas with “open” feed-systems don’t show full
band coverage concerning constant
gain, unchanging radiation-pattern and low SWR and furthermore don’t have optimum efficiency.
They can also be very difficult to tune on all bands.
Gain figures
Gain figures for OptiBeam Multiband Antennas are by means of NEC code software
the calculated values have been verified and therefore
don't represent exaggeration at all. They don't have too.
Because of the design, the low loss feed system, and
the attention to detail gain figures quoted are realized equal to that of mono-banders
of equivalent size.
Assembly
The assembly of OptiBeam multi-band antennas is done easily and quickly due to specially
pre-worked and pre-assembled parts.
OptiBeam multi-band antennas are reliable, strong, and
will put a smile on the face of the most demanding ham.
Get a better beam
for your money!
!!! Q u a l i t y m a d e i n G e r m a n y !!!
| 
