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TELE-audiovision.com— 05-06/2013 — TELE-audiovision International — 全球发行量最大的数字电视杂志
nothing to be found in the 18.3 to 18.8
GHz band. It‘s not exactly a positive
result.
But that doesn‘t mean it will always
be like that; the Ka-band will certainly
continue to be expanded on.
The transmissions in the Ka-band
typically are not modulated in DVB-S/
S2. Because of the intolerance to rain,
an IP-based transmission in this fre-
quency range is preferred, in which
packets containing errors can be re-
quested again.
The Ka-band is immense and it’s
especially in the higher frequencies
where you‘ll find a lot of communi-
cation signals. The average person,
though, doesn‘t know about this since
it’s not advertised anywhere. This
range is used, for example, in military
applications. But it’s precisely these
kinds of communications that are ex-
citing to the DXer! Who wouldn‘t want
to listen in to these professional com-
munications?
The main problem, though, is the
difficulty in finding a matching LNB and
feedhorn for the different frequency
ranges in the Ka-band. And even if they
would be available, you‘d still have a
4. The SL3 is custom-made for DirecTV and is to
be used with DirecTV satellite dishes. The LNB
does not fit to regular feed holders, so I had to
improvise a little. Using two screws I attached a
metallic plate to the LNB which then was glued
with tape to the dish. This is only a temporary
solution, but worked well and was easy to do. This
is really a big and heavy LNB.
5. Yes, ir worked just fine! The DirecTV SL3 LNB
mounted a European regular dish. But it was too
heavy for the motor, which coul dnot handle the
additional weight.