Schweitzer Engineering Laboratories SEL-3031 - Table 2.3 900-Mhz Frequency Skip Zones (Part Numbers Starting with 30310); Table 2.4 900-Mhz Frequency Skip Zones for Brazil (Part Numbers Starting with 30311); Table 2.5 Length Vs. Loss in Coaxial Cables at 900 Mhz

Date Code 20181001 SEL-3031 Instruction Manual
Installation
Overview
2.7
Feedlines
The feedline used with the antenna is as important as the antenna. Coaxial cables
should have low attenuation and rated for outdoor use. Keep the feedline as short as
possible to minimize signal loss between the radio and antenna. Times Microwave
LMR
®
-400 or RG-8X A/U coax cables are preferred. If longer lengths or less loss is
desired for the radio link then larger cable such as Andrew HELIAX
®
can be used.
Table 2.5 lists the signal losses (in dB) for the indicated lengths of each cable type at
900 MHz.
Table 2.3 900-MHz Frequency Skip Zones (Part Numbers Starting With
30310)
Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8
902.6–
903.8
904.1–
905.3
905.6–
906.8
907.1–
908.3
909.2–
910.4
910.7–
911.9
912.2–
913.4
913.7–
914.9
Zone 9 Zone 10 Zone 11 Zone 12 Zone 13 Zone 14 Zone 15 Zone 16
915.2–
916.4
916.7–
917.9
918.2–
919.4
919.7–
920.9
921.2–
923.0
923.3–
924.5
924.8–
926.0
926.3–
927.5
Table 2.4 900-MHz Frequency Skip Zones for Brazil (Part Numbers Starting
With 30311)
Zone 1 Zone 2 Zone 3 Zone 9 Zone 10 Zone 11
902.6–903.8 904.1–905.3 905.6–906.8 915.2–916.4 916.7–917.9 918.2–919.4
Zone 12 Zone 13 Zone 14 Zone 15 Zone 16
919.7–920.9 921.2–923.0 923.3–924.5 924.8–926.0 926.3–927.5
Table 2.5 Length vs. Loss in Coaxial Cables at 900 MHz (Sheet 1 of 2)
Cable Type
3.05 meters
(10 feet)
12.24 meters
(50 feet)
30.48 meters
(100 feet)
91.44 meters
(300 feet)
RG-8X A/U
(SEL-C964)
0.70 dB 3.50 dB 7.0 dB Unacceptable
Loss
LMR-400
(SEL-C966)
Do not use 1.95 dB 3.90 dB Unacceptable
Loss
1/2-inch
HELIAX
Do not use 1.15 dB 2.29 dB 6.87 dB
7/8-inch
HELIAX
Do not use 0.64 dB 1.28 dB 3.84 dB
Preliminary Copy—Subject to Change