VAMP 9243 Vertical Active Rod Antenna 

The active monopole antenna VAMP 9243 consists of a vertical rod and an impedance matching amplifier. The rod has a standard length of 1m (other rod lengths on request) and can be considered as short compared to the wavelength in the frequency range 9 kHz-30 MHz. The conversion factor is independent of the frequency because of the extremely high impedance of the matching amplifier. The circuit gives the best results of noise and intermodulation for a conversion factor (antenna factor) of +10 dB and sensitive measuring receivers are able to use the whole dynamic range of the antenna.

For very high field strength, an optional plug-in attenuator reduces the amplification by 20 dB. In order to avoid absolutely any influence by the mains, power supply, voltage regulator a. o., the VAMP 9243 has built-in NiMH rechargeable batteries. The typical operation time is at least 50 hours. Charging time is 2-4 hours using the quick charger. The Rod antenna and amplifier cabinet are made of aluminum. The top plate can be fixed to the metal ground plane (Counterpoise) with 4 screws.

The connectors and controls are situated below the top plate. The rod length begins exactly at the top plate.

    Options

• Opt. GP: Aluminium-Groundplane, 0.6 x 0.6 m
• Opt. GP foldable: Option for ground plane 0.6 x 0.6 m of VAMP 9243 B antenna: foldable in half for easier transportation. To be ordered together with the GP f. 9243.
• Opt. GP 60x140: Option for the ground plane: instead of 60x60 cm, with larger sizes of 60x140 cm. To be ordered together with the GP f. 9243.
• Opt. ACS 410: Charger ACS 410
• Opt. VT: 20 dB plug in divider to measure high-field strength
  [Picture]
• Opt. CA 9243: Calibration Adapter for VAMP 9243
• Opt. MIL461F bonding kit:
  • Bonding kit for VAMP 9243 acc. MIL-STD-461F consists of a BNC
  • cable double-shielded ca. 70 cm, with braid
  • current blocking ferrite in the center, elbow aluminum angle
  • with BNC bulkhead adapter.

    Low Noise Active Verticle Monopole Antenna 

 1. Overview VAMP 9243

The active monopole antenna VAMP 9243 consists of a vertical rod and an impedance matching amplifier. The rod has a standard length of 1m (other rod length on request) and can be considered as short compared to the wave length in the frequency range 9 kHz-30 MHz. The conversion factor is independent of the frequency because of the extremely high impedance of the matching amplifier. The circuit gives best results of noise and intermodulation for a conversion factor (antenna factor) of +10 dB and sensitive measuring receivers are able to use the whole dynamic range of the antenna.

For very high fieldstrength, an optional plug-in attenuator reduces the amplification by 20 db. In order to avoid absolutely any influence by the mains, power supply, voltage regulator a. o., the VAMP 9243 has built-in NiMH rechargeable batteries. The typical operation time is at least 50 hours. Charging time is 2-4 hours using the quick charger. Rod antenna and amplifier cabinet are made of aluminium. The top plate can be fixed to the metal ground plane (Counterpoise) with 4 screws. The connectors and controls are situated below the top plate. The rod length begins exactly at the top plate.

2. Application

 Basically the active monopole antenna is an electric field strength adapter. In combination with our magnetic field probes, for example FMZB 1537, electric and magnetic field strength can be measured separately with high sensitivity in the frequency range from 9 kHz - 30 MHz. Standards, especially in the automotive field, give very precise specification for the measuring site. Usually the monopole antenna is mounted on a metal (electric) counterpoise. Measurement is made in a shielding room.