UL-4850-389, Broadband, Low Profile Antenna (450-520 MHz)

Broadband, Low Profile Antenna (450-520 MHz), Description

Model UL-4850-389 is a broadband, Low Profile, rugged, mobile radio antenna designed to service the whole 450-520 MHz UHF band, used in EMS (Emergency Medical Services), Law Enforcement, Government and Civil services in the Americas. With modest dimensions of 1.5"/4 cm (OD) x 4"/10 cm (height), this antenna radiates with a typical peak omnidirectional gain of +3 dBil, when mounted on a large metal surface of at least 40 cm (16 in) radius. Internally, the radiating element is DC grounded to help protect the transceiver from indirect ElectroStatic Discharge (ESD).

The European/EU version of this antenna is our UL-4150-389 Broadband UHF TETRA,Low Profile Antenna, which covers the spectrum of 380-450 MHz.

UL-4850-389 Technical Specifications

• Frequency range: 450-520 MHz
• Coverage: Omni-directional, low azimuthal ripple (1 dB)
• Polarization: Linear, Vertical (when mounted upright)
• Gain: +3 dBil minimum
• Nominal Impedance: 50 ohm (RF), Short Circuit (DC)
• Input Power: 50 Watts CW
• VSWR: under 3.0
• Connector: NMO, Female (see caution under NOTES)
• Dimensions:
  • Housing 3.8 cm (1.5") OD x 10.3 cm (4.05") h
  • Bottom flange 5 cm (2") OD x 3 mm (0.12") h
• Mounting: NMO connector (w/AS568B-027 O-Ring)
• Operating Temperatures: -40°C to +85°C
• Shock: Operates after drop from 6 m/20 ft onto asphalt
• Weight: 100 g / 0.25 lbs
• Shipping Weight: 200 g / 0.45 lbs (shipped individually)

• Requires a ground plane (normally mounts on a metal body)
• Its large bandwidth allows this antenna to be used for the surveillance of signals ranging from 200 MHz to 1 GHz
• CAUTION: In the market, there are many sources of uncontrolled NMO mounts and cable assemblies. Although we have found that most "low cost" NMO connectors available can perform well, their cable assemblies tested poorly, particularly above 700 MHz, due to a low degree of "RF care" when connecting the coaxial cable to the NMO connector. Observed carelessness results in the accidental addition of a stray series inductance, with a reactance comparable to the 50 ohm input impedance, generally worsening the match seen by the transceiver connected at the other end. However, most cable assemblies acquired and measured, performed reasonably at the lower UHF frequencies (400-512 MHz).

	CAD Files available:
	IGES 3D
	STEP 3D
	SolidWorks 3D
	Pro/Engineer 3D
	Catia 3D

This product is compatible with the following Antenna Accessories:

• NMO Mount and Cable Assembly for Mobile Radio Antennas