Figure 6 -Wrapping Coax Connections - Elpro Technologies 915U-2 User Manual

915U-2 Wireless I/O
The net gain of the antenna/cable configuration is determined by adding the antenna
gain and the cable loss. For example, a 6 element Yagi with 70 feet (20 metres) of
Cellfoil has a net gain of 4dB (10dB – 6dB).
Country
USA / Canada
Australia / New Zealand
Europe
Antenna
Dipole with integral 15' cable
5dBi Collinear
8dBi Collinear
6 element Yagi
9 element Yagi
16 element Yagi
Cable Type
RG58
RG213
CC10 (3m Cellfoil)
CC20 (6m Cellfoil)
Connections between the antenna and coaxial cable should be carefully taped to
prevent ingress of moisture. Moisture ingress in the coaxial cable is a common cause
for problems with radio systems, as it greatly increases the radio losses.
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Maximum Gain per region
Typical Antenna Gains
(3dBd)
(6dBd)
Typical Coax losses (900 MHz)
Stretch to elongate sealant tape
while wrapping over the connection
For proper UV protection Electrical
Tape should then be wrapped over
the Vulcanising Tape

Figure 6 -Wrapping Coax Connections

Max Gain (dB)
6
0
0
Gain (dB)
0
5
8
10
12
15
Loss (dB per 30ft / 10m)
-5dB
-2.5dB
-3dB
-6dB
915U-2 Wireless I/O
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