Planar Log-Periodic Antenna AX-31CH)



In stock

SKU: AX-31CH Category:


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-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.

Technical Specifications
•Type: Log-Periodic Dipole Array
•Frequency Range: 290 to 2200 MHz
•Antenna Forward Gain: 5.0 dBi @ 950 MHz
•Amplifier Gain: (AX-31C, AX-31CP, AX-31CH and AX-31CM only) 26 dB @ 500 MHz, 19 dB @ 1950 MHz
•Amplifier Noise Figure: 1.8 dB
•Amplifier IP3: +26 dBm
•Primary Sensitivity: E-field
•Polarization: Horizontal or vertical (depending on mounting)
•Usage: AX-31C, AX-31CP, AX-31CH, AX-31CM: Receive only
AX-31CX, AX-31CHX, AX-31CMX: Receive and transmit
•Transmit Power: 5 W max (AX-31CX, AX-31CHX, AX-31CMX only)
•Impedance: 50 ohm (typ.)
•Power: AX-31C: 9V (PP3 type battery) @ 42 mA, AX-31CP, AX-31CH, AX-31CM: 12V DC @ 60 mA
•Connector: SMA
•Front-to-Back Ratio: 20 dB min above 600 MHz, 5 dB @ 430 MHz
•VSWR: 1.7:1
•Size: 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)
•Weight: 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)

Specifications are subject to change without notice due to continuous product development and improvement.