UL-4600-319, GMRS Antenna/UHF Commercial Band Mobile Radio Antenna

GMRS Antenna/UHF Commercial Band Mobile Radio Antenna

Our GMRS Antenna is a Broadband, rugged, UHF Commercial Band mobile radio antenna covering the General Mobile Radio Services band and beyond (450-470 MHz), featuring a high ESD (ElectroStatic Discharge) isolation. With modest dimensions of 1.5"/4 cm (OD) x 4"/10 cm (height), this antenna radiates with a typical peak omnidirectional gain of +5 dBil, when mounted on a large metal surface of at least 16"/40 cm radius. This antenna will survive a 20 ft drop onto asphalt and continue operating (see Drop Test results).

Internally, the radiating element is DC grounded and the feedpoint is DC isolated beyond 1 kV.

UL-4600-319 Technical Specifications

• Frequency range: 450-470 MHz
• Coverage: Omni-directional, low azimuthal ripple (1 dB)
• Polarization: Linear, Vertical
• Gain: +4 dBil
• Nominal Impedance: 50 ohm (RF), Open Circuit (DC) 1 kV isolation, radiating element grounded
• Input Power: 50 Watts CW
• VSWR: 2.0 GRAPH (more detail under NOTES)
• 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 Dash Number 027 O-Ring)
• Operating Temperatures: -40C to +85C
• 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)

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NOTES:

• 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
• Operating bandwidth of an antenna is often taken to mean its "VSWR Bandwidth". Depending on the transmitter's capability to handle mismatches, the actual bandwidth of this antenna can vary greatly. Below is a table of 4 common VSWR bandwidth figures for this antenna, based on the random measurement of a sample unit.
  • VSWR of 1.5: 468-447 = 21 MHz
  • VSWR of 2.0: 477-439 = 38 MHz
  • VSWR of 2.5: 485-434 = 51 MHz
  • VSWR of 3.0: 492-431 = 61 MHz
• 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).

GMRS Antenna/UHF Commercial Band Mobile Antenna 3D CAD Drawings

	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

Specify desired length from drop-down menu

Specify desired connector for the radio end: (usually Type N, TNC or BNC Male)