SHF-Design precision Yagi antennas

CAD manufactured high performance antennas - Made in Germany -: Multiple-optimized design according to DL6WU All holes of the boom drilled automatically by robot - extreme small tolerances Elements automatically cut, length tolerance less than max. 0.1 mm Elements are exactly centered and automatically mounted by robot Non-compromise dipole: N-connector, balun made of semi-rigid cable, all connectors sealed, connection box additionally filled.	The antennas have an very high f/b ratio because of the use of 8 reflectors. This is in particular important for high-gain yagis: even the highest gain gets useless if unwanted signals or interferences are being received from the back side of the antenna. EME or SAT freaks enjoy our antennas due to the low backward noise scatter (from the surface of the earth). All nuts, bolts and washers are manufactured of stainless steel. For those antennas with support strut also the mast clamp itself is made of stainless steel (where else do you find this?). The antennas are delivered pre-mounted with all elements already in place. They can be assembled in about 10 minutes; you don't have to read the manual (which is provided of course...) and it does not take an engineering approach to install the antenna and get into the air...
SHF-Design Dipole	Mast clamp
Radiating elements from 1200MHz - 2400 MHz. Of course with Teflon N-connectors and a sealed balun transformer.	Mast clamp of the SHF-long yagi
Reflector	CNC drilling machine
	As one can see the nut holes for the boom are drilled by a computer-aided robot; each and every boom having the highest possible precision.
The multi-reflectors (8x) guarantee highest f/b ratio.
CNC cutting robot	Assembly robot
Each element is cut down to a precision of 1/10th of a mm.	As can be seen here the pre-manufactured elements are being forced into the center position and are automatically fixed to the boom.

More information

SHF 2367

As far as we know this is the longest 23 cm antenna manufactured in series production. The antenna has 22 λ in length and almost 20 dBD in gain, it's a high tech/high performance product. All mounting parts and nuts are made of stainless steel. Due to the 8x-reflector the antenna shows a very high front to back ratio (f/b). At 19.9 dBD gain the antenna has a gain of 22 dBi (over isotropic). The side lobe attenuation is 17 dB. The entire performance of the antenna follows the physical laws and is optimized by CAE-design. The E- and H-plane 3-dB beamwidth are practically equal and facilitates therefore the stacking and combination of several identical yagis to form a high gain antenna array. The antenna covers the entire 23 cm band and does not display any de-tuning effects caused by rain or wind. The support strut is designed so that the antenna does not mechanically deform in the horizontal plane.
We offer a replacement dipole in case this would ever become necessary (Part No. 18400.01), and also a special dipole which is mounted upside down to facilitate 2x2 H setups and has a 180° phase difference to the normal dipol (Part No. 18400.02).

Richard, K07N sent the following testimonial, dated Dec. 2002:

Subject: WiMo 2367 Testimonial Dear Sirs, I installed 2 of your 2367 in the interior of a 8 x 432 EME array, located 43.5 meters above the ground. After performing due diligence and several discussions with Gerry at SSB I purchased your antennas. Goal was to get best performance form home QTH. Mounted on non conductive EXTREN riser in the interior of the array, I note minimal reaction with the other antennas. Using remote LNA, the performance is outstanding. In the NW USA there are many mountains and hills up to ~3400 meters high. UHF and SHF can be very difficult. Recently made QSO with WA7TZY (CN87wr) ~261 miles QTH to QTH. BOth of these stations are below 150 meters ASL. I'm in CN84ia. Obviously not line of site. Whatever I hear I can work. Your antennas are fed with 46 meters of Andrew 1 5/8" Heliax. The array was constructed to enable stacking of 2 more and this spring will have 4 x 2367s here. Here are a few pictures and a link to my website. http://home.teleport.com/~rewing/ From right side, 2 x 2367 vertically are on the third riser. Array was elevated for this view from the ground.
Under construction view when array was on the ground. 73 and CHEERS, de KO7N CN84ia Richard Ewing PNW VHF Society C-075

SHF 2344

The new design "SHF 2344" is the 'little brother' of the 5 m version and is quite a 'hummer' with its 3 m length. The antenna has a high bandwidth and may be used just as well for ATV operation. Of course, this antenna is supplied fully assembled; the awkward manual mounting process has been replaced by the assembly robots.
We offer a replacement dipole in case this would ever become necessary (Part No. 18400.01), and also a special dipole which is mounted upside down to facilitate 2x2 H setups and has a 180° phase difference to the normal dipol (Part No. 18400.02).

Antenna comparision of various 23cm Yagis by Dubus 1/2006 (English, JPG, 170KB, opens in a new browser window)

SHF 2328

The "SHF 2328" model is the ideal start-up model for 1.3 GHz; the antenna is a mere 1.5 m long and has 16 dBD gain. The mechanical data is almost identical to the other SHF-antennas. The electrical characteristics are absolutely identical with the SHF long yagis except for the 3-dB beamwidth and the gain.
We offer a replacement dipole in case this would ever become necessary (Part No. 18400.01), and also a special dipole which is mounted upside down to facilitate 2x2 H setups and has a 180° phase difference to the normal dipol (Part No. 18400.02).

SHF 1367

This is the super yagi for the 13cm-band. At such high frequencies the antenna design turns out to be quite complicated. All tolerances must be observed down to the minimum. The length of the elements changes in just some 1/10th mm steps. It takes many calculations and approximations to optimize the design of the boom and the elements which are thick compared to the wave length; many corrections must be tested and implemented until the optimal mechanical dimensions are found.
As described before all yagis of SHF-Design are manufactured and assembled automatically; the boom will be supplied with all elements assembled. Consequently, the tolerances coming to play are kept down to the absolute minimum compared to the good old 'manual assembly' done by the user. The 13cm yagis all have 6 reflectors and show a performance of 25 dB f/b ratio.
We offer a replacement dipole in case this would ever become necessary (Part No. 18410.01), and also a special dipole which is mounted upside down to facilitate 2x2 H setups and has a 180° phase difference to the normal dipol (Part No. 18410.02).

SHF 1340

The super yagi for the 13 cm-band with fore-mast mounting. Thus, mounting anywhere on a mast (and not necessarily on top of the mast) is possible. The mechanical set-up becomes quite simple. By utilizing high quality/low loss coaxial cable and the shortest possible feedline the lower gain of the 13cm-super yagi can be compensated in many cases.
We offer a replacement dipole in case this would ever become necessary (Part No. 18410.01), and also a special dipole which is mounted upside down to facilitate 2x2 H setups and has a 180° phase difference to the normal dipol (Part No. 18410.02).

Directional pattern

Technical Data

Download mounting instructions. (PDF, DE/EN, 140KB)

Antenna comparision of various 23cm Yagis by Dubus 1/2006 (English, JPG, 170KB, opens in a new browser window)

Notes about stacking

In case the antennas will be stocked H-shaped it is recommended to order optional mirrored dipoles (with 180 degrees phase shift) for use as the two lower antennas. These two antennas should be mounted upside down with the connectors facing upwards. Then it is possible to use absolutely symmetrical feedlines and to put the power splitter right in the center of the array.
Please bear in mind: This is an option at extra cost; the special dipoles will be supplied instead of the standard dipoles!

Diagrams at varying humidity

Diagram 1: dry antenna Diagram 2: slightly humid antenna Diagram 3: humid antenna

The leftmost side of the picture displays the measurement frequency 1200 MHz and the rightmost side of the picture represents approx. 1365 MHz. The three curves were taken at different humidity levels of the antenna. The lowest curve was taken with a wet antenna and the dipole being totally submerged in water. As you can see the antenna maintains the mid-band resonance as per specification. Only the gain drops a little bit over 1300 MHz.

Directional pattern SHF 1367