Naval TDA-3 Technical document

Since 1971, the objective of Naval Electronics has been to offer the
best possible products for TV and Radio reception at sea. Naval
began with omnidirectional antennas and is the world leader in this
field of technology today. Now, with an expanded product range, the
name Naval means much more than antennas. Naval operates in
more than 40 countries and has installations on thousands of
vessels all over the world.
All specifications stated are subject to change without notice.
Naval Electronics AB
Höjdrodergatan 18, SE-212 39 Malmö, Sweden
Tel. [phone]. Fax [phone]
E-mail:[e-mail] www.naval.se
TDA-3 Technical Installation Manual
0605
INSTALLATION:
The TDA3 should be mounted as high as possible
and placed away from obstructing elements as
funnels, radio communication antennas, masts,
smokestacks etc to avoid reflection and
interference. Make sure it can be rotated freely.
Be careful when mounting the TDA-3, antenna
elements must not be damaged.
The TDA3 is designed to be mounted on a rotor.
The rotor shall be of heavy-duty type. See
“Technical specifications side above.
The TDA3 should be mounted as close as possible
to the rotor, preferably bolted directly, or with a short
tube not over 300mm long. Tube diameter 50mm.
The mounting base of the TDA3 can be fitted with a
mounting flange Naval No 164038 for 50mm-mast
tube. See drawing of mounting base.
The coaxial downlead should be well protected and
secured to the mast. Make sure to provide sufficient
slack so the TDA3 can rotate without stretching the
coaxial cable. Unload the downlead cable with by
means of cable clamps and protect it from
mechanical damage. Avoid outdoor cable joints, but
if necessary make sure they are waterproof by
using self-vulcanising rubber tape or similar.
Factors as transmitting power, polarization,
radiation angle and antenna height affect the
received signal strength.
The TDA3 shall be connected to the downlead with
a 75-Ohm N-connector.
Use self-vulcanising rubber tape or simillar to make
the connection waterproof.
MAINTENANCE:
The TDA3 is made of high quality aluminium and
the surface is anodized in black to furnish a durable
surface.
TDA3 must be inspected annually in order to
maintain proper function.
Check list:
The elements of the TDA3 is protected with rubber
plugs, replace if worn.
Make sure the seal of the coaxial connection is in
good condition. If worn replace with new self-
vulcanising rubber tape or similar.
Check the cable clamps unloading the downlead.
Replace if worn.
Check the bolts on the TDA3 and on the rotator,
tighten if loose or replace if worn.
If an element of the TDA3 is bent, carefully
straighten out the element. If an element is broken
and loss in performance is noticed, the TDA3 can
be repaired.
Maintenance of the rotor se the manufacturers
manual.
© Copyright 2000 Naval Electronics AB
3022

TDA-3 Terrestrial Directional Antenna
Mechanical measurements of mounting flange
USER MANUAL:
The TDA3 is designed to cover the frequency range 170-890 MHz, however TDA3 will also perform with reduced
specifications in the area of 40-170 MHz as well. The high gain of the TDA3 makes it perform well during weak
signal conditions. With high attenuation of the back and sidelobes the TDA3 will secure good reception in areas
with many reflected signals as encountered in harbours.
To get the best performance from the TDA3 the rotor should be controlled from a Navtrack unit. This unit will keep
the TDA3 pointed automatically at a designated transmitter. For further information see Navtrack Technical leaflet
and manual.
TECHNICAL SPECIFICATIONS
Dimensions
Height
Rotating diameter
Width
Gain
40-170 MHz
170-230 MHz
470-890 MHz
Half power beamwidth
170-230 MHz
470-890 MHz
Front to back ratio
170-230 MHz
470-890 MHz
Front to side ratio
170-230 MHz
470-890 MHz
Minimum recomended
rotation torque
Operation temp. range
Weight
Material
Finish
350 mm
1870 mm
990 mm
Unspecified
9 dBi
8 dBi
±30o
±32o
28 dB
22 dB
26 dB
23 dB
60Nm
-40 - +70°C
8 kg
Aluminium
Military green (RAL6014)