UAV-1000711-001
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8.6.3 Antenna Cable
The Ping200S is designed to meet Class 1 requirements with an allowance
of 2dB for loss in connectors and cable used to connect it to the antenna.
Excessive loss will degrade both transmitter output power and receiver
sensitivity.
Allowing for 0.25dB loss for the connector at each end of the antenna cable
assembly leaves an allowance of 1.5dB maximum loss for the cable itself.
An acceptable cable:
has less than 1.5dB loss for the run length needed,
has a characteristic impedance of 50ohms,
has double braid screens or has foil and braid screen.
Once the cable run length is known, a cable type with low enough loss per
meter that meets the above requirements can be chosen. Longer runs
require lower loss cable.
The following table is a guide to the maximum usable lengths of some
common cable types. Actual cable loss varies between manufacturers.
There are many variants, and the table is based on typical data. Use it as a
guide only and refer to the manufacturer’s data sheet for your specific
chosen cable for accurate values.
Length
Insertion
Loss
MIL-C 17
Specialists SSB
Electronic
(meters)
(dB/m)
2.54
0.59
M17/128
2.54
0.59
RG400
3.16
0.47
3C142B
3.81
0.39
RG304
4.5
0.33
Aircell 5
5.25
0.29
RG393
311601
6.42
0.23
311501
6.81
0.18
Aircell 7
8.22
0.18
311201
12.59
0.12
3108801
