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SHF-Design Precision Yagis
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 enormous 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 operators 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
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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 Robot
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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
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Each element is cut down to a precision of 1/10th of a mm.
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As can be seen here the pre-manufactured elements are being forced into the center position and are automatically fixed to the boom.

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Instructions SHF-Design Hi-precision Yagis (about 140 KB)
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SHF 2367

As far as we know this is the longest 23 cm antenna manufactured in series production. The antenna has 22 lambda 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 if 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.
SHF 2344

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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.
SHF 2328

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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.
SHF 1367

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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.
SHF 1340

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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.
SHF 1633

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This is a low-profile antenna compared to a 60 cm parabolic dish. It has fore-mast mounting, 16.3 dBD gain and enables noise-free receiving of METEOSAT.

 

Optional and recommended:
Super low-noise pre-amplifier for METEOSAT type MKU 172A or SLN-1700

SHF 1658
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This is a further development of the 1st weather satellite antenna for METEOSAT II which was originally designed in 1984. It's a real alternative antenna compared to a parabolic dish of 1 m diameter; the electrical energy received is at least equal to the dish antenna! Today's state-of-the-art pre-amps and converter make the 3 m antenna sufficient for noise-free receiving of the weather pictures. Just set-up on the same mast as the TV antennas - and forget it. Built-in long durability. The 8 x reflector array and the extra long support strut are part of the standard package.
Order No. 18425

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SHF 2365: 65 Element-Super-Long Yagi from DL7YC for 1296 MHz, 3-dB beamwidth in H- (above) and E-plane (below) up to -50dB
Technical Data
Technical Data 23 cm 13 cm Meteosat
Type SHF... 2328 2344 2367 1340 1367 1633 1658
Frequency 1240-1300 2300-2450 1690-1700 MHz
Number of Elements 28 44 67 40 67 33 58
Gain ISO 17.5 20.2 22.0 18.7 22.1 18.4 20.8 dB
Gain dBD 15.4 18.1 19.9 16.6 20.0 16.3 18.7 dBD
Length 1.6 3.0 5.1 1.6 3.0 1.6 3.0 m
Electrical Length

6.5

13 22 9.3 22.7 8.5 18.7
3-dB Beamwidth 21.8 16.5 13.7 18.8 13.2 19.6 14.9
Side Lobes -17 -17 -17 -16 -16 -17 -17 dB
Front-to-Back-Ratio f/b 26 26 27 25 25 25 25 dB
Stacking Distance 570 751 913 391 522 483 638 mm
SWR typ. 1.2 1.2 1.2 1.2 1.2 1.2 1.2
Wind Load (120 km/h) 38 86 134 55 90 48 95 N
max. Mast- 52 52 52 52 52 60 52 mm
Shipping Size 1.6 1.6 2.65 1.6 1.55 1.65 1.7
Dipole-Feed N - Connector N-Connector N - Connector
fore-mast
Support Strut

 

down1.gif (990 bytes) Download Assembly Manual here:

 

In case the antennas will be stacked 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!


Additional price for special dipole 23cm 180
Additional price for special dipole 13cm 180

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Measurement trace 1: dry antenna
Measurement trace 2: antenna in a bit of humidity
Measurement trace 3: wet antenna

The outermost left side of the picture displays the measurement frequency 1200 MHz and the outermost right 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.
(Who else shows you such kind of traces??)

Radiation Pattern of a SHF 1367
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Radiation Pattern of a SHF 1367.
Side lobes at -15,8 dB.
Front to back ratio approx. 29 dB
124 Cherrywood Drive
Mountaintop, PA 18707
       570-868-5643
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