SECTION 3. RADIOTELEMETRY NETWORK COMPONENTS
3-7
TABLE 3-7 Common Antennas and Characteristics
VHF or
Pipe
Mounting
Antenna
Type
UHF
Cable
Gain(dB)
O.D.
Type
BA1010
Omni
VHF
Coax NM-L
Unity
3/4" - 2 1/8"
U-Bolts
BA1012
Omni
VHF
Coax NM-L
Unity
1" - 2 1/4"
U-Bolts
BA1312
Omni
VHF
Coax NM-L
3.0
1" - 2 1/4"
U-Bolts
BA6012
Omni
UHF
Coax NM-L
Unity
1" - 2 1/4"
U-Bolts
BA6110
Omni
UHF
Coax NM-L
Unity
3/4" - 2 1/8"
U-Bolts
BA6312
Omni
UHF
Coax NM-L
3.0
1" - 2 1/4"
U-Bolts
PD200
Omni
VHF
Coax NF-L
5.8
1" - 2 3/4"
PD46 (Fig 3-5)
PD201
Omni
UHF
Coax NF-L
5.0
1" - 2 3/4"
PD46 (Fig 3-5)
PD220
Omni
VHF
Coax NF-L
5.25
1" - 2 3/4"
PD46 (Fig 3-5)
PD344
Dipole
VHF
Coax NF-L
4.5
2 1/2"
Clamps
PD390S
Yagi
VHF
Coax NF-L
8.0
1 5/16, 2 1/4, or 2 3/8
PD37 (Fig 3-4)
PD400
Omni
VHF
Coax NM-L
7.5
1" - 2 3/4"
PD46 (Fig 3-5)
PD688S
Yagi
UHF
Coax NF-L
10.0
1 5/16" - 2 1/4"
U-Bolts
PD1107
Omni
VHF
Coax NF-L
3.0
1" - 2 3/4"
PD46 (Fig 3-5)
PD1121
Dipole
VHF
Coax NF-L
3.0
2 1/2"
Clamps
3.4 TRIPODS, TOWERS, ENCLOSURES,
AND POWER SUPPLIES
There are several methods of mounting and
housing sensors and other equipment for a
station.
3.4.1 TRIPODS AND TOWERS FOR MOUNTING
For the different mounting requirements,
Campbell Scientific offers the CM6 Tripod, CM10
Tripod, UT3 Tower, and UT930 Tower. All
mounting options available from Campbell
Scientific are rugged instrument mounts that
provide sturdy support for Campbell Scientific
sensors, enclosures, and measurement
electronics. The CM6 and CM10 Tripods can be
used as a portable instrument mount in a variety
of applications. The UT3 and UT930 Towers
provide a more sturdy long-term support
3.4.2 ENCLOSURES
Enclosures are needed to keep water and
debris from damaging the data acquisition
equipment. Campbell Scientific, Inc. enclosures
are designated as “raintight,” and are designed
to mount on a tripod. Following is a description
of the standard enclosures.
Campbell Scientific offers two enclosures for
housing a CR10T and peripherals. The
fiberglass enclosures are classified as NEMA
4X (water-tight, dust-tight, corrosion-resistant,
indoor and outdoor use). A 1.25” diameter
entry/exit port is located at the bottom of the
enclosure for routing cables and wires. The
enclosure door can be fastened with the clasp
for easy access. The enclosure’s clasp door
can be secured with a basic lock. Both
enclosures are white for reflecting solar
radiation, reducing the internal temperature.
The Model ENC 12/14 fiberglass enclosure
houses the CR10T and power supply, and one
or more peripherals. Inside dimensions of the
ENC 12/14 are 14" x 12" x 5.5", outside
dimensions are 18" x 13.5" x 8.13" (with
brackets); weight is 11.16 lbs.
The model ENC 16/18 fiberglass enclosure
houses the CR10T and power supply, and two
or more peripherals. Inside dimensions of the
ENC 16/18 are 18" x 16" x 8.5." Outside
dimensions are 21.75" x 21" x 11" (with
brackets); weight is 17.2 lbs.
3.4.3 POWER SUPPLY
A radiotelemetry network requires a reliable
power supply at each station. A solar panel or
110/220 VAC charging source is normally
required due to the large current drain of the
radio.
3.4.3.1 Lead Acid Batteries
Lead acid batteries are designed to be float
charged by a solar panel or AC power source.
The role of the lead acid battery is to supply
power when the charging source is absent, e.g.
in case of power failures (AC charging), or
during times of zero charge with a solar panel.
