1
Safegua
rds
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Terms and
Warranty
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Principl
e o
f
Operati
on
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Ins
talla
tion
5
Operati
on
6
C
ont
rol Syst
em
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RF Componen
ts
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Power
Supp
ly
9
Maintenan
ce
10
Troubleshoo
ting
Antenna and Tower Recommendations (if applicable)
Your preliminary engineering workgroup should establish your antenna and tower
requirements, if applicable, both for receiving and transmitting antennas.
Construction of sturdy, high quality antenna/tower systems will pay off in terms of
coverage of your service area, the overall quality and saleability of your radiated
signal, and reduced maintenance expenses. Technalogix provides complete
turnkey antenna systems if needed. If your site is serving as a translator, your
receiving antenna should be in line of sight to the originating station all year
round. The foliage will change with season. Transmitting antennas can enhance
or seriously impair the amplifier or transmitter output.
The selection, routing, and length of coaxial cable are extremely important in the
installation. If there is a 3 dB line loss in the cable between your unit’s output and
the transmitting antenna, the unit will only deliver half power. Buy the best cable
you can obtain, route it via the shortest way to the antenna, and keep it straight.
Do not form it into sharp bends on its way. Do not use any more cable fittings for
the installation than absolutely necessary. All cautions here apply equally to all
coaxial cables in the system - input and output.
Pay attention to radial ice accumulation when designing the transmission system.
It is not uncommon for at least an inch of ice to build up on a tower or antenna in
some locations. This in turn significantly increases the weight, cross section, and
wind loading of the system, not to mention creating issues from reflective power.
Attaching the transmission line to the tower is crucial to maintain a safe and
reliable operation. Nylon wire ties and electrical tape will breakdown in the
sunlight and ultimately fail, creating a potentially dangerous situation. It is
important to use proper clamps and hoisting grips and also ensure that the
transmission line is grounded to the tower in several locations. When high
currents flow through the tower in the event of lightning strikes, some of that
current will flow through the outer conductors of the transmission lines. Due to
the resistance difference between the steel tower and copper transmission line, a
significant voltage can be developed, often resulting in arcing between the outer
jacket and outer conductor, thus pitting the conductor.
Preventative maintenance is crucial in ensuring that safety is maintained.
Specifically, check that transmission line grounds are tight and are not missing
any hardware. Frequently inspect support clamps or spring hangers. Consider
investing in an ice break, if you haven’t already done so, as shards of falling ice
can damage the transmission line – and if it is going to happen, it will happen at
an important time. Check the tower light photocells and conduit.
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