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1:1 Downlink controller |
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DESCRIPTION
1:1 Redundant Amplifier (LNB,LNA)
Switch Controller
Description for the Model DNL-4.
The DNL-4 interfaces to two LNBs,
and one wave guide switch.
(wave guide switch not normally
included.)
The controller contains an
independent power supply for each
LNB. Other power supplies include a
28V (for switching), and a 5 volt
for logic.
The DNL-4 also contains 2 L-band
Bias Tees which are 4 port devices.
The forth port is an oscillator
input. (reference input). The LNB
reference signal is injected at the
rear of the DNL-4 chassis via BNC
connectors. (If used)
Please Note that any bias tees can
be used. Let us know about your
application and we’ll incorporate
the bias tee of your choosing.
Rear Chassis Bulkhead Connections
include:
1) RF output from coax switch
2) Connections to amplifiers from
bias tees
3) 10 Mhz Reference inputs to bias
tees (If used)
The controller contains S2 (see
front panel). S2 is a coax switch
that receives the RF coming back
from the LNBs. The output from this
switch is presented on a rear
chassis bulkhead mounted connector.
(If a manual override type transfer
switch is chosen, then the manual
override knob is rear chassis
mounted for easy access.
Note: (28V refers to any voltage in
the range from 20V to 30V.)
The standard controller assumes a
switch common of –28v and the
position commands are +28v. If your
application requires something
different, let us know. However the
coax switch and waveguide switch
should have the same voltage and
polarity. Also, the wave guide
switch must have position indicators
for use by the controller.
All internal RF cabling is high
quality semi-ridged, polycoated,
0.141 coax cabling. The RF Bulkhead
connectors may be user specified.
The controller has a standard
RS232/RS485 serial connection. A
relay I/O rear chassis output is
also standard.
The controller can monitor two types
of fault inputs that may be “ORed”
together. The LNB power being
supplied is current monitored with
an adjustable allowable window.
Other fault input types include
normally open or normally closed
fault inputs. (dip switch
selectable)
The automatic mode can respond to
either or both fault types. (dip
switch selectable)
The controller has a universal
voltage input. The AC input is a CE
marked/ Hi Pot tested filtered
input. The front panel AC switch
doubles as a circuit breaker for the
entire unit.
LNB power supplies are normally 24V
or 15V with a power rating of 30W.
Higher currents are available.
The Local control unit has a height
of 3.5” (2 RU), and a front panel
width of 19”, and a depth of approx.
24” (no cables attached). It is
designed to mount in a standard 19”
relay rack.
Slides are optional.
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