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Box 5579, Lincoln NE 68505 UHF Log Periodic Antenna Order No. 71147000 PN802573 INSTRUCTION MANUAL General Description The ALP-450 is a broadband directional log periodic antenna. It will receive any frequency 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 also directional (like a TV antenna) and will have the best reception when pointed at the transmitter. This yields the benefit of less interference from unwanted signals coming from the back or side of the antenna. SPECIFICATIONS (average) Gain..................................................................................................................4.6 dBd 1/2 Power Beam Width.........................................................................................120° Front-to-Back Ratio...........................................................................................19.4 dB SWR.......................................................................................................................1.5:1 Input Impedance ................................................................................................50 ohm Input Connector....................................................................................................TNC Antenna Placement The ALP-450 should be placed in a position that has a clear view of the transmitter(s) for best results. Obstructions such as walls, ceilings, and metal objects will reduce range and performance. Antenna Mounting The ALP-450 is supplied with a variety of mounting hardware. It should always be mounted vertically with the arrows pointing toward the transmitter(s). See Figure 1. MOUNT VERTICALLY END VIEW Figure 1 Antenna Mounting -1- Microphone Stand Adaptor Attach the microphone stand adaptor using the screws and spacers supplied with it. See Figure 2. FRONT VIEW SIDE VIEW Figure 2 Microphone Stand Adaptor 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. Figure 3 Angle Bracket -2- Clamps Clamps are provided for mounting the ALP-450 on pipes, scaffolds, tree limbs, etc.. Attach the clamps with the hardware supplied. See Figure 4. ALP-450 BOLT № NOTE OFFSET IN CLAMPS LOCKWASHER \ WING NUT Figure 4 Clamps Do not clamp the antenna to horizontal metal objects that extend past the clamp. See Figure 5. This will detune the antenna and cause loss of range and performance. GOOD Figure 5 Clamp Mounting BAD -3- Coax Cable For best results, it is recommended that cable losses be kept under 4 dB. (Every 3 dB of signal loss results in a system operating distance reduction of 25%). See the accessories section of this manual for special low loss cable assemblies. MOUNTING SUGGESTIONS Mic Boom Mic Stand Wall -4- Top Surface Combination: Bracket with Clamps -5- ACCESSORIES Special Low Loss Antenna Cables with TNC Connects Length Part No. 10 Ft. (3 meters) 690419 25 Ft. (7.6 meters) 71151-025 50 Ft. (15 meters) 71151-050 75 Ft. (23 meters) 71151-075 100 Ft. (30 meters) 71151-100 PRINTED IN U.S.A. Copyright© 1995 by Telex TELEX COMMUNICATIONS, INC. All rights reserved. 20 Sept 1995 -6-...