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. All power supplies have universal AC Voltage input.

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.

     Features:

            4 Power supplies:

                        a)  LNB A Power supply

                        b)  LNB B Power supply

                        c)  5V Logic Power supply

                        d)  Supply for switching 20-30V wave guide switch.

      Dual 2 Amp Bias Tees with oscillator inputs.             Bias Tees

             Optional Connections for RF paths.

                        Choose from:

a)      BNC,  SMA,  N,  

             Options for Coax switch (S2)

             Choose from:

                  a: Latching Transfer coax Switch 

                 b: Latching Transfer coax Switch with Mechanical Override 

                 (switch without manual over ride costs less)

Faults can be monitored either by a dry contact fault indicators or by setting a current window that monitors each LNB power supply.  Faults

Interfaces to (almost) any wave guide switch (Not Included).  Typically 22-30V.

 Wave Guide Switch Operation

Modes

Manual or Automatic mode

Control from Local or 3 Remote locations.