Telex TV Antenna ALP 450 User Manual

UHF Log Periodic Antenna  
Order No. 71147000  
PN802573  
8601 East Cornhusker Highway, P.O. Box 5579, Lincoln NE 68505  
INSTRUCTION MANUAL  
General Description  
The ALP-450 is a broadband directional log peri-  
odic antenna. It will receive any frequency from  
450 to 900 MHz. The “gain” of this antenna en-  
ables 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 re-  
sults. Obstructions such as walls, ceilings, and  
metal objects will reduce range and performance.  
Antenna Mounting  
The ALP-450 is supplied with a variety of mount-  
ing hardware. It should always be mounted verti-  
cally with the arrows pointing toward the  
transmitter(s). See Figure 1.  
Figure 1  
Antenna Mounting  
-1-  
 
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.  
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  
BAD  
Figure 5  
Clamp Mounting  
-3-  
 
Coax Cable  
For best results, it is recommended that cable losses  
be kept under 4 dB. (Every 3 dB of signal loss re-  
sults in a system operating distance reduction of  
25%).  
See the accessories section of this manual for spe-  
cial low loss cable assemblies.  
MOUNTING SUGGESTIONS  
Mic Boom  
Mic Stand  
Wall  
Top Surface  
-4-  
 
Pipe or Scaffold  
Tree Limb  
Combination:  
Bracket with Clamps  
-5-  
 
ACCESSORIES  
Special Low Loss Antenna Cables with  
TNC Connects  
Length  
Part No.  
10 Ft. (3 meters)  
25 Ft. (7.6 meters)  
50 Ft. (15 meters)  
75 Ft. (23 meters)  
100 Ft. (30 meters)  
690419  
71151-025  
71151-050  
71151-075  
71151-100  
PRINTED IN U.S.A.  
Copyright© 1995 by Telex  
TELEX COMMUNICATIONS, INC.  
All rights reserved.  
20 Sept 1995  
-6-  
 

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