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Coaxial Cable
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The antenna for the LR-100 can be mounted directly on the unit if desired.
However, you may find that the unit will provide better performance when the
antenna is located elsewhere. If you plan to mount the antenna in a different loca-
tion than on the top of the unit, you must use cable and connectors rated at 50
Ohms. Although cable used for cable TV installations looks similar to this cable, it
won’t work with your Listen system.
If you need to run cable over a greater length than 50 feet for 216MHz applications
or greater than 100 feet for 72MHz applications, we recommend that you use RG-8
cable rather than RG-58. It is a lower loss cable, meaning that more of your signal
will reach the antenna.
Long cable runs can result in signal degradation due to “loss” characteristics of the
cable. At 72MHz, there is an average loss of 2dB per 100 feet of cable and at
216MHz an average* loss of 5 dB per 100 feet of cable. (A 3dB loss means half of
your power has been lost.) However, it is better to suffer coaxial power loss than to
try to shoot your signal through obstacles! Obstacles, especially metal, can create
drop-outs or reflections of your signal that will result in poor listening conditions.
*Note: There are large varieties of 50 Ohm, RG58 and RG8 cables. You may pur-
chase a cable that is better or worse than this value. Please check with the cable
vendor or manufacturer for exact specifications.
Coaxial Cable