Garmin GNS 480 Installation Manual page 22

General Information
1.3.10 A
NTENNA
1.3.10.1 GPS Antennas
1.3.10.1.1 A-33 (590-1104)
Early production runs of PN 590-1104 were marked with TSO-C129a. This antenna was re-qualified to
TSO-C144 with no changes to the antenna. P/N 590-1104 antennas marked with TSO-C129a
identification are identical to those marked with TSO-C144.
Applicable TSO: ........................................................ TSO-C144 (RTCA/DO-228 with Change No. 1)
Frequency:..................................................... 1575 MHz
Polarization: .................................................. Right Hand Circular
Axial Ratio: ................................................... 3 dB Max at bore site
Radiation Coverage:...................................... Elevation Angle
Finish:............................................................ Polyurethane Enamel
Weight: ......................................................... 3.9 oz. (0.11 kg)
Height: .......................................................... 0.61 inches (1.55 cm)
Operating Temperature: ............................... -55°C to +85°C
Operating Altitude: ...................................... 55,000 feet (16,764m) max.
Amplifier:
Gain ........................................................ 26.5 dB ±2 dB
Noise Figure: .......................................... 2.5 dB Max
Impedance:.............................................. 50 ohms
VSWR (Dry):.......................................... < 1.5:1
VSWR (Rain): ........................................ < 2.0:1
Band Rejection: ...................................... 35 dB
Power Handling:..................................... 1 Watt
Voltage: .................................................. 5 VDC ±10%
Current:................................................... 35 mA nominal, 40 mA max.
Group Delay (3dB bandwidth) ............... 27 ±10 nanosecond
Pass Band Ripple (3dB bandwidth) .......0.2 dB max
1-12
R
EQUIREMENTS
L1 Filter Bandwidth......................... 1575 ±20 MHz (3 dB)
560-0982-01 Rev A
Minimum Gain
>15º -2.0 dBic
10º -3.0 dBic
5º -4.5 dBic
0º -7.5 dBic
+110, -210 MHz (60dB)
GNS 480 (CNX80) Installation Manual