Instruction Manual

22
SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System Instruction Manual Date Code 20210405
Device Installation
Feed Lines
The feed line used with the antenna is important. Use coaxial cables that have
low attenuation and are rated for outdoor use. Keep the feed line as short as pos-
sible to minimize signal loss between the radio and antenna. RG-8X or LMR-400
coaxial cables are preferred. If longer lengths or less cable loss is desired for the
radio link, then you can use a larger cable, such as a 7/8" HELIAX. Tabl e 3 lists
the signal losses for the indicated lengths of each cable type.
To avoid water intrusion, seal all connections with coax sealing tape and ensure
that the lowest point on the feed line is not a connector into which water could
ingress.
Table 2 SEL-FR12 Orderable Antennas
Typ e
SEL Part
Number
Description Length
Omnidirectional
Diameter
Mounting
Omnidirectional
235-0003
Low-profile 3 dBi Gain Omnidirectional Antenna,
698–960 MHz, 1710–2700 MHz, N Female
Connector
90 mm
(3.5 in)
37 mm
(1.4 in)
915900494
235-0232
7.15 dBi Gain Omnidirectional Antenna,
902–928 MHz, N Female Connector
1358.9 mm
(53.5 in)
33.3 mm
(1.3 in)
240-0106
(for mounting
to existing
mast)
235-0233
9.15 dBi Gain Omnidirectional Antenna,
902–928 MHz, N Female Connector
2476.5 mm
(97.5 in)
33.3 mm
(1.3 in)
240-0106
(for mounting
to existing
mast)
235-0257
5.15 dBi Gain Omnidirectional Antenna,
843–873 MHz, N Female Connector
711.2 mm
(28 in)
33.3 mm
(1.3 in)
240-0106
(for mounting
to existing
mast)
Yagi, Directional
235-0009
3-Element, 8.15 dBi Gain Yagi Antenna
896–970 MHz, N Female Connector
426.75 mm
(16.8 in)
N/A
Mast mount
included
235-0220
5-Element, 11.1 dBi Gain Yagi Antenna,
902–928 MHz, N Female Connector
548.6 mm
(21.6 in)
N/A
Mast mount
included
235-0222
11-Element, 14.15 dBi Gain Yagi Antenna,
902–928 MHz, N Female Connector
914.4 mm
(36 in)
N/A
Mast mount
included
235-0258
3-Element, 8.65 dBi Gain Yagi Antenna,
806–896 MHz, N Female Connector
330.2 mm
(13 in)
N/A
Mast mount
included
235-0259
11-Element, 14.15 dBi Gain Yagi Antenna,
806–896 MHz, N Female Connector
939.8 mm
(37 in)
N/A
Mast mount
included
Indoor 235-0108 Indoor Antenna, TNC Male Connector
203.2 mm
(8 in)
N/A N/A
Table 3 Estimated Length vs. Loss in Coaxial Cables
Cable Type
Characteristic
Impedance
3.05 Meters
(10 Feet)
12.24 Meters
(50 Feet)
30.48 Meters
(100 Feet)
91.44 Meters
(300 Feet)
RG-8X
(SEL-C964, SEL-C975)
50  0.70 dB 3.50 dB 7.0 dB Unacceptable loss
LMR-400
(SEL-C966, SEL-C968)
50  0.39 dB 1.95 dB 3.90 dB Unacceptable loss
7/8" HELIAX
(SEL-C978)
50  Do not use 0.64 dB 1.28 dB 3.84 dB