PREFACE
FG4491 GPS Antenna - V01.00 3 / 6
hopf
Elektronik GmbH
Nottebohmstr. 41
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D-58511 Lüdenscheid
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Tel.: +49 (0)2351 9386-86
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Fax: +49 (0)2351 9386-93
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Internet: http://www.hopf.com
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1 Preface
This text specifies the basic operational characteristics of the active GPS antenna module
4491 under a standard test condition of 5V DC & 25°C / 50% R.H.
2 Introduction
4491 is the integration of a high performance GPS patch antenna and a state-of-the-art low
noise amplifier into a very low profile / extremely compact / fully waterproof enclosure which,
when connected to a GPS receiver with 5V DC antenna power, provides excellent signal
amplification and out-band filtering & rejection.
3 Specifications
PHYSICAL
Construction: Polycarbonate-radome at top, die-cast
shell at bottom / rubber gasket for water
seal in between
Dimension: 58mm (L) x 48mm (W) x 15mm (H)
Weight: 65 grams (excluding cable & connector)
Color: dark gray
Standard Mounting: Magnet mount with two magnets
Optional Mounting 1: Screw mount with two M3 tapped holes
on the plastic flange of 4491
Optional Mounting 2: Mounting plate (aluminium)
ANTENNA ELEMENT
Center Frequency: 1575.42 MHz +/- 1.023 MHz
Polarization: R.H.C.P. (Right Hand Circular
Polarization)
Absolute Gain at Zenith: +5 dBi typically
Gain at 10° Elevation: -1 dBi typically
Axial Ratio: 3 dB max.
Output VSWR: 1.5 :1 max.
Output Impedance: 50 Ohm