User's Manual

ASC TRIND™ Technology Update
Page 18 MDE-3591A TRIND
™
/TIRIS
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Retrofit Kits C00011-002-XXXX • 11/00
PRELIMINARY
FCC 11/30
ASC TRIND™ Technology Update
The TRIND™ system utilizes technology and devices not commonly used in the
industry. Read the following carefully to familiarize yourself with relatively
unique aspects of TRIND and prevent field problems.
RF Transmission and Antennas
Located in the TRIND card cage is a transmitter printed circuit board (PCB). The
RF antennas are connected to this board during installation.
Applying power to the card cage with either antenna disconnected will
result in damage to the transmitter PCB.
• The transmitter PCB may be burned up immediately, or its effective life
shortened drastically.
• The PCB may perform properly at installation, but will require premature
field service at a later date.
For single-sided units, a ‘dummy load’ connector R20526-G1 is provided for
unused ‘B’ side of the PCB.
Note: Power must never be applied to the card cage without a load, either antennas
or dummy load connector.
Co-Axial Cable
Co-axial antenna cables in cable harness M00878A002 used for TRIND are more
flexible and smaller diameter than more familiar co-axial cable, such as that used
for cable television. However, all co-axial cables share this feature:
Too severe a turn or bend in the cable will break the center (solid) wire.
This can result in a seemingly good but in actuality intermittent signal. This too
may result in what appears to be proper performance at installation that is
followed by premature failure and field service. Replacing damaged cable in the
field is an extensive task.
In addition, a damaged cable will also cause a situation where the transmitter
PCB is powered without load, and damage the PCB.
Note: Turns or bends in co-axial cables must be gradual loops, no sharper than a
1" radius (2" diameter).
ATTENTION: AUTHORIZED SERVICE CONTRACTORS
READ THIS SECTION BEFORE PROCEEDING WITH INSTALLATION