Illumination unit  Night Fly NF-5XL

NF-5 XL unit is designed for illumination of big models with wingspan two meters and more.  It is used to power color ultra bright LEDs (Light-Emitting Diode) with the nominal current of 120, 350 or 700 mA. The unit contains eight independent current-powered outputs. Two outputs are for position lights (P1 and P2), three outputs are designed to power the anti-collision flashing lights (F1, F2 and F3) and three outputs power the landing lights (L1, L2 and L3). Switching on of the second landing light output is delayed by one second against the first landing output. That produces an effect of phased switching by the pilot. 

The unit offers eight different flashing combinations (0 -7) with one second period for F1 and F2 outputs. See the diagram on the left side. One of those combinations can be selected by couplers (jumpers) 1, 2, 4. The sum of numbers of the connected couplers represents the number of the selected combination. The diagram on the left side shows default combinations. Eventually, customer can propose other combinations and try them using a program simulator, store them into a file and ask them when ordering new unit. The program simulator is available on the Web.

The F3 output has an independent time base so its flashes drift slowly against flashes F1 and F2. This makes more realistic impression. The F3 jumper contacts make possible to set the number of flashes of the anti-collision light F3. With jumper on position "2x" or "3x" the unit produces two or three flash pulses per second.  Without jumper, the light makes one pulse.  
 
The unit can be used as controlled or non-controlled by pilot. If controlled by pilot, the jumper "3p" allows you to select between 2-positions (Fly/Landing) or 3-positions (Off/Fly/Landing) control by the remote controller. With a 2-positions control the position and anti-collision lights start work when the unit is connected to the accumulator. However, the landing lights can be switched on and off by pilot. In the 3-positions control system, all lights are off in the off-position. In the fly-position the position and anti-collision lights are on and in the landing-position, all lights are on. 

Unit is in non-controlled mode if the Rx cable is not connected to the receiver. In this case the lights start work when the unit is connected to the accumulator and the "3p" jumper can be used to switch manually the landing lights on and off. 

Anti-collision and landing lights automatically begin to flash when the receiver is unable to receive a signal from the remote controller. The receiver circuit and the light circuits are electrically separated by an opto-coupler. Unit is compatible with Graupner or Hitec-type connectors.

The outputs maintain the nominal current in the wide range of voltage from (4,8V) 6V to 14V without the need to connect compensating resistance series in the circuit. The stabilization starts working from 5,0V, therefore it is possible to connect the unit to a NiCd or NiMH batteries from 4 up to 10 cells or Li-Pol from 2 up to 3 cells. As the number of the cells of the powering accumulator increases, so does the number of diodes that can be connected (serially) on each output. Using seven-cell-accumulator, 2 green or white diodes or 3 red or yellow diodes can be connected into one output. It is only necessary that the sum of voltages of diodes plus 1,8V (for output circuit functionality) is below the voltage of accumulator, otherwise the luminosity of LEDs falls down.  The typical working voltage for red and yellow LEDs is 1,8 to 2V. For white and green it is from 3,0 to 3,3V. The colors of diodes in one circuit can differ.  The diodes are powered from the positive pole of accumulator against the common negative pole. 

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