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Фрагмент инструкции
It is optimized for reception of frequencies from 450 to 900 MHz. The gain of this antenna enables it to receive signals from a greater distance than a typical “whip” type antenna. Log periodic antennas are very directional and will have the best reception when pointed at the transmitter. This design also means less interference from unwanted signals coming from the back or side of the antenna. SPECIFICATIONS (Typical) Gain..................................................................................................................................4.6 dBd 1/2 Power Beam Width ........................................................................................................120° Front-to-Back Ratio ..........................................................................................................19.4dB SWR.......................................................................................................................................1.5:1 Input Impedance ................................................................................................................50 ohm Input Connector ....................................................................................................................TNC Placement The LPA500 should be placed in a position that has a clear, unobstructed path to the transmitter. Obstructions to the signal such as walls, ceilings and metal objects will reduce range and performance. Generally speaking, placing the LPA500 at an elevated location will yield the best performance over the largest area. Antenna Mounting The LPA500 is supplied with a variety of mounting hardware to make installation easy. It should always be mounted vertically with the arrow pointing towards the transmitters(s). See Figure 1. when oriented correctly, the LPA500 will appear as a thin piece of metal when viewed from the transmitter’s position. For best results, do not clamp the LPA500 to horizontal metal objects that extend past the clamp (see Figure 5). Metal rods or other objects that block part of the large face of the antenna will detune it and cause loss of performance. MOUNT VERTICALLY END VIEW Figure 1 Antenna Mounting -1 Microphone Stand Adapter Attach the microphone stand adapter using the screws and spacers supplied with it. See Figure 2. LPA500 SPACERS ALTERNATE LOCATION FOR MIC BOOM SCREW FRONT VIEW SIDE VIEW Figure 2 Microphone Stand Adapter Angle Bracket Attach the angle bracket using the nuts, lockwashers, and screws supplied with it. Self tapping screws are supplied for securing the bracket to wood, metal, or other surfaces. See Figure 3. LPA500 TAPPING SCREW NUT SLOTTED SCREW LOCKWASHER ANGLE BRACKET Figure 3 Angle Bracket -2 Clamps Clamps are provided for mounting the LPA500 on pipes, scaffolds, tree limbs, etc.. Attach the clamps with the hardware supplied. See Figure 4. LPA500 BOLT NOTE OFFSET IN CLAMPS WING NUT LOCKWASHER Figure 4 Clamps Do not clamp the antenna to horizontal metal UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA objects that extend past the clamp. See Figure 5. This will detune the antenna and cause loss of range and performance. GOOD BAD Figure 5 Clamp Mounting -3 Connectors and Cable Model Part Number Length CXU-10 690419 10 ft (3 M) The LPA500 is equipped with a TNC connector CXU-25 71151-025 25 ft (7.6 M) to provide reliable signal connection. To avoid CXU-50 71151-050 50 ft (15 M) signal strength reduction, special low-loss cables CXU-75 71151-075 75 ft (23 M) should be used. These are available from CXU-100 71151-100 100 ft (30 M) Electro-Voice in the following lengths: MOUNTING SUGGESTIONS UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA Mic Boom UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA Top Surface UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA Mic Stand Wall -4 UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA CUT OFF IF POSSIBLE UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA CUT OFF IF POSSIBLE Pipe or Scaffold Tree Limb UHF THIS END TOWARD TRANSMITTER LPA500 R LOG PERIODIC ANTENNA Combination: Bracket with Clamps -5 Uniform Limited Warranty Electro-Voice products are guaranteed against malfunction due to defects in materials or workmanship for a specified period, as noted in the individual product-line statement(s) below, or in the individual product data sheet or owner’s manual, beginning with the date of original purchase. If such malfunction occurs during the specified period, the product will be repaired or replaced (at our option) without charge. The product will be returned to the customer prepaid. Exclusions and Limitations: The Limited Warranty does not apply to: (a) exterior finish or appearance; (b) certain specific items described in the individual produc...