APPENDICES Page 64
Document id: 7000 108-011 A2
APPENDIX A.5 – GPS-CABLE SELECTOR
The table below gives recommendation on cables that can be used
for the GPS-antenna connections. Due to the high frequency it’s
important that the attenuation in the cable is low for the specific
frequency (1.5 GHz).
Type Attenuation @ 1.5
GHz (dB/m)
∅ (mm)
Weight (kg/100m)
RG 400 0.6 4.95 6.3
RG 223 0.6 5.40 5.5
RG 214 0.35 10.8 18.5
RG 225 0.3 10.9 23.3
For optimum performance of the transponder approximately +10dB
gain should be available when the cable attenuation has been
subtracted from the GPS-antenna preamplifier gain.
Example:
Cable type Preamplifier
Gain (dB)
Recommended min
cable length (m)
Recommended max.
cable length (m)
RG 223 12 0 20
RG 223 26 20 45
RG 223 36 45 60
RG 214 12 0 35
RG 214 26 35 70
RG 214 36 70 100
Min. length = (Preamp. Gain – 10 dB)/Cable attenuation per meter
Max length = Preamp. Gain/Cable attenuation per meter
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