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Mobile antenna 30831

Mobile antenna 30831

Mobile antenna 30831

The 30831 rod antenna is designed to work with vehicle radiotelephones operating in frequency band 380 ÷ 470 MHz. This type of antenna is adapted for installation on any motor vehicle.

Electrical specifications:

Typ (electrical length of antenna)


Code of horizontal antenna radiation pattern

000ND00 (according to CEPT T/R 25-08 Recommendation)

Versions of the antenna as a function of operating frequency


Operating band [MHz]

1, 2, 3

20 MHz from 380 ÷ 470

Nominal input impedance

50 Ω

Standing wave ratio (SWR):
 for frequency frez
 in operating band 30 MHz


Antenna's power gain with the respect to the unipole λ/4

0 dB (2,15 dBi)

Polarization type


max power

100 W

Type of antenna connector








without connector

Type of antenna cable

RG58 All (or equivalent) 5m length

Tuning methode

cutting antenna's rod

Mechanical specifications:

Max height of antenna over the vehicle's body 

227 mm

Radiator weight

0,1 kg

Weight of antenna with coaxial cable

0,3 kg

Antenna mounting hole diameter

Φ 16,2 mm

Environmental conditions:

Operating temperature

-40°C ÷ +60°C

Relative humidity

< 98% in temp. +40°C

Operating conditions:

Antenna needs to be mounted to the metal body of a vehicle or to the metal bracket which is galvanically connected to the bodywork, which is a “ground plane” for the antenna. The place of mounting of the antenna needs to be close to the center of the largest horizontal plane of vehicle’s metal bodywork or close to the center of the whole structure of a vehicle. This way of installation ensures correct antenna impedance and a horizontal radiation pattern closest to circular. The hole in a vehicle’s bodywork of a diameter of Φ 16,2 mm is required for installation of the antenna. During the installation it is particularly important to ensure a galvanic contact between the antenna base (shield of a coaxial cable supplying an antenna ) and the bodywork of a vehicle.

The antenna is produced for lower frequency of sub-range given as a "operating band". Tuning to the operating frequency is done by cutting the top of antenna's rod to the required length, after installation of the antenna.