Trimble Zephyr L1 L2 GPS GNSS Antenna 39105-00

Trimble Zephyr L1 L2

Trimble Zephyr Antenna

New Antenna Technology from Trimble

The Trimble Zephyr and Zephyr Geodetic antennas are two
new types of survey-grade, dual-frequency, GPS antenna.
They are designed to match the performance of the choke
ring antenna, while being smaller, lighter, and significantly
less expensive.

Both antennas are the result of intensive research and
development, and utilize recent innovations in high performance
GPS antenna technology, for which patents
have been issued to Trimble. The new antennas incorporate
major advancements in:

  • Radio frequency antenna design
  • Advanced materials technology
  • High precision manufacturing techniques
  • Trimble Stealth Ground Plane technology

The result is antenna phase center (APC) repeatability and
multipath resistance comparable to the choke ringóand
improved tracking of low elevation satellites and in difficult

The use of advanced materials enables the Trimble Zephyr
and Zephyr Geodetic antennas to be extremely compact and
lightweight. Although the antenna element and low noise
amplifiers used today will need to be modified in order to
be compatible with the future L5 second civil frequency, the
underlying design of the new Trimble Stealth Ground Plane
is independent of frequency. This will make it much more
effective for use with the new frequency than more
conventional ground planes.

Trimble Zephyr

Patented Antenna Element Design
Sub-millimeter Repeatability

The GPS antenna element is the part of an antenna that is
sensitive to energy transmitted from GPS. For precise GPS surveying,
this element is usually a flat piece of metal called
a ìpatchî antenna. It is usually round or approximately
square, and its dimensions make it sensitive to the GPS
frequency being tracked. When a GPS receiver/antenna
combination is tracking satellites and making code and
carrier phase measurements, the actual points in space
between which those measurements are taken are the
instantaneous phase centers of the GPS satellite and GPS
receiver antennas.

Trimble Zephyr GNSS GPS


Dimensions: 6″ diameter x 2.25″ maximum
Weight: 1 lb
Operating temperature range -40 to +70 C
Humidity: 100% humidity proof, fully sealed
Shock: Shock tested for a drop of 2 m
onto concrete
Vibration: Vibration tested to MIL-STD-810
Antenna: 4-point antenna feed for
sub-millimeter phase center
Amplifier: Integral Low Noise Amplifier
Gain: 50 dB antenna gain

Trimble Zephyr GPS Antenna P/N: 39105-00
* Trimble Zephyr GPS Antenna P/N: 39105-00 [ID- X1438]
* Trimble P/N: 70800-15 Cable

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Trimble Zephyr Spec Sheet