SECTION 3. RADIOTELEMETRY NETWORK COMPONENTS
3-5
3.2.2 RADIO SPECIFICATIONS
The RF100 and RF200 radios are manu-
factured by E.F. Johnson. Campbell Scientific
modifies the radios to work with the RF95T
Modem. Table 3-5 contains a list of the main
radio specifications.
TABLE 3-5. Main Radio Specifications
RF100
RF200
VHF
UHF
E.F. Johnson Model No.
3420
3410
Power Output
4W
5W
Frequency (MHz)*
132-142, 142-150,
403-430, 430-450,
150-162, 162-174
450-470, 470-512
Channel Capability
1
1
Dimensions (w/o mounting)
3.6" x 2.9" x 2.2"
3.6" x 2.9" x 2.2"
Operating Temperature Range
-30°C to +60°C
-30°C to +60°C
Emissions Designator
16KOF2D
16KOF2D
Deviation
±
2.5 kHz
±
2.5 kHz
Current Drain
Quiescent
30mA
30mA
Active
1.7 A
1.5 A
* DOC Compliance for 138-174 MHz and 403-470 MHz only.
TABLE 3-6. Radio to RF Modem Pin
Descriptions
RF100/RF200
RF95T RF
Radio 10-pin
Modem 10-pin
1
2
2
7
3
6
4
10
5
open
+12V Red Wire
6
9
7
3
8
5
9
open
GND Black Wire
10
1
3.2.3 RADIO INSTALLATION
The RF100 and RF200 Radios are shipped
from Campbell Scientific mounted on a special
bracket with a cable going from the radio to a
BNC connector (see Figure 3-3). The following
steps will install a radio for a field or repeater
station.
1. Secure the radio and its bracket using the
four screws from the RF95T Modem's lid.
2. Connect the 10-pin connector (with the red
and black power leads coming out of it) of
the radio/RF modem cable into the radio.
3. Connect the second 10-pin connector of the
cable into the RF modem.
4. Route the BNC end of the antenna cable
through the enclosure conduit. Connect the
cable to the BNC Jack connector secured
on the radio mounting bracket.
5. Connect the red and black power leads
from the radio cable to the 12V and Ground.
3.3 ANTENNAS AND CABLES
Antennas radiate and receive the radio signals.
Each radio in a radiotelemetry system must
have an antenna. A 50 ohm coax cable is used
to connect the antenna to the radio.
3.3.1 ANTENNA MOUNTS
Antennas must be mounted above any
surrounding buildings or obstacles. Antennas
must be properly oriented in relationship to the
other antennas for RF communications to work.
Antennas have various mounting options.
Table 3-6 lists mounting specifications for
several common Celwave antennas. Specific
questions regarding antennas can be directed
to Campbell Scientific, Inc. or Celwave.
Celwave's address and phone numbers are:
Celwave
Route 79
Marlboro, NJ 07746
(908) 462-1880 or (800) 321-4700
FAX (908) 462-6919
