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The AX-31C antenna is a compact VHF/UHF log-periodic directional antenna, a successor to the popular AX-31B antenna, with improved performance and reduced weight and dimensions,
as well as additional packaging options: an outdoor mounting version and a hand-held one.
This antenna is constructed on a high-quality fibre-glass substrate, with an integrated low noise amplifier. The user can also specify antenna versions without the inbuilt amplifier, which does not require any power to operate. Versions
without the amplifier can be also used as low power transmit antennas.
The AX-31C antenna covers a frequency range of 290 to 2200 MHz (a wider frequency range can be still received with reduced gain) and is ideally suited for reception of point-to-point communications where its directional
characteristics can significantly improve rejection of interfering signals. The directionality is especially significant above 400 MHz; under 400 MHz the directionality gradually declines
to the point when the antenna acts as a non-directional dipole.
While designed to be entirely general-purpose and performing well with any third-party equipment, the WiNRADiO AX-31C antenna is
especially suitable for WiNRADiO G3 Series of VHF/UHF receivers, in both professional and consumer applications.
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The antenna comes in three versions. The standard AX-31C version consists of a bare board suited for indoor applications, with an SMA connector and
a battery holder for a standard PP3 type 9V battery (the battery and cable are not included). There is also an On/Off switch
and an indicator LED on the board.
With a simple modification which can be performed by the user, the antenna can be also powered externally via the coaxial cable,
using a "Bias-T" power injector, such the WiNRADiO WR-BT-3500. A factory-configured antenna
for 12V DC external power (without the battery holder) is available under model number AX-31CP.
The user can also specify an antenna model without the internal amplifier (AX-31CX), which does not require any power to operate.
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The AX-31CH version comes encapsulated in a ruggedized enclosure with a hand grip, making it possible for the antenna to be used as a hand-held directional antenna for surveillance, monitoring and measurement applications.
The antenna comes with a 3 meter (9.8 ft) cable with an SMA connector at the receiver end. There is no provision for a battery inside the unit; it is expected that the user provides 12V DC via the coaxial cable, using a "Bias-T" power injector, such as for example
the WiNRADiO WR-BT-3500. The user can also specify an antenna model without the internal amplifier (AX-31CHX), which does not require any power to operate.
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The AX-31CM version of the antenna is suited for mast-mounting, including outdoor applications. The adjustable metal bracket makes it possible to mount the antenna on a mast of maximum 3" (approx. 75 mm) of diameter.
This makes it possible to use this antenna for UHF point-to-point communications.
The antenna comes with a 3 meter (9.8 ft) cable with an SMA connector at the receiver end. There is no provision for a battery inside the unit; it is expected that the user provides 12V DC via the coaxial cable, using a "Bias-T" power injector, such as for example
the WiNRADiO WR-BT-3500. The user can also specify an antenna model without the internal amplifier (AX-31CMX), which does not require any power to operate. Such antenna can be also used for low-power transmit applications.
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Technical Specifications
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Type
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Log-Periodic Dipole Array
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Frequency range
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290 to 2200 MHz
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Antenna Forward Gain
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5.0 dBi @ 950 MHz
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Amplifier Gain
(AX-31C, AX-31CP, AX-31CH and AX-31CM only)
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26 dB @ 500 MHz
19 dB @ 1950 MHz
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Amplifier Noise Figure
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1.8 dB
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Amplifier IP3
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+26 dBm
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Primary Sensitivity
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E-field
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Polarization
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Horizontal or vertical
(depending on mounting)
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Usage
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AX-31C, AX-31CP, AX-31CH, AX-31CM: Receive only
AX-31CX, AX-31CHX, AX-31CMX: Receive and transmit
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Transmit power
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5 W max (AX-31CX, AX-31CHX, AX-31CMX only)
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Impedance
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50 ohm (typ.)
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Power
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AX-31C: 9V (PP3 type battery) @ 42 mA
AX-31CP, AX-31CH, AX-31CM: 12V DC @ 60 mA
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Connector
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SMA
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Front-to-back ratio
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20 dB min above 600 MHz
5 dB @ 430 MHz
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VSWR
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1.7:1
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Size
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AX-31C, AX-31CP: 292 x 217 mm (11.5" x 8.5")
AX-31CH, AX-31CM: 300 x 248 mm (11.8" x 9.7")
(excluding handle or mounting bracket)
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Weight
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AX-31C: 155 g (5.5 oz)
AX-31CP: 150 g (5.3 oz)
AX-31CH: 720 g (25.4 oz)
AX-31CM: 1100 g (38.8 oz)
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Specifications are subject to change without notice due to continuous product development and improvement.
The following standard AX-31C antenna versions are available:
| Ordering Code | Description |
| WR-AX-31C | Bare substrate only, no enclosure, includes preamplifier, receive only, 9V battery power |
| WR-AX-31CP | Bare substrate only, no enclosure, includes preamplifier, receive only, external 12V DC power |
| WR-AX-31CX | Bare substrate only, no enclosure, no preamplifier, receive and transmit |
| WR-AX-31CH | Ruggedized enclosure with hand grip, includes preamplifier, receive only, external 12V DC power |
| WR-AX-31CHX | Ruggedized enclosure with hand grip, no preamplifier, receive and transmit |
| WR-AX-31CM | Ruggedized enclosure for outdoor mast-mounting, includes preamplifier, receive only, external 12V DC power |
| WR-AX-31CMX | Ruggedized enclosure for outdoor mast-mounting, no preamplifier, receive and transmit |
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Please use our Rapid Response Form to register your interest in this product, or to request more information.
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