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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.
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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assembled; the awkward manual mounting process has been replaced by the assembly robots.
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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.
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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.
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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.
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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 |
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 |
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