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Antennas:

Tips

  • Use the best antenna you can effort
  • If possible, work with more then one antenna
  • Balun or matchbox have to be located near the antenna feed, not on the receiver input!
  • Use excellent cables, switches and connectors
  • Do not use to many switches or connectors (don't split cables)
  • Check for a god ground
  • Use a multicoupler if you use more then one receiver

www.raven-research.com, RF-, IF-Distributoors, Splitters, Antennas RR1110
www.rf-systems.nl, RF-Distributors, Splitters, Antennas DX-1, DA-4, T2FD, WFL
www.boger-electronics.com Classifier, Receivers, Antennas KE-Classifier, modified AOR receivers, DF
www.wellbrook.uk.com,  LOOP ANTENNAS FOR OUTSTANDING DIRECTIONAL RADIO RECEPTION OF MEDIUM WAVE, LONG WAVE & SHORT WAVE


DX-ONE-MK2

The DX - one professional electronic antenna is an omni-directional active antenna which has been designed to receive signals coming in under any angle and from any polarisation. The DX - one professional offers constant sensitivity over the frequency range from 20 kHz to 60 MHz, and can be used for monitoring from 10 kHz to 90 MHz. The indoor unit is equipped with a switchable MW wave rejection filter, a gain control and can feed two receivers. Each receiver can be tuned and operated as if it is connected to its own antenna, since there is no mutual interaction. The DX - one professional was originally developed to meet military specifications and is in daily use at embassies and governmental- and military monitoring stations




Specifications
  • Frequency Coverage: 20 kHz - 60 MHz, usable as monitor antenna from 10 kHz -  90 MHz
  • Receiving pattern: Omni-directional
  • Polarisation : mixed horizontal and vertical
  • Antenna Gain: + 10 dB
  • Maximum output level : 2 x + 20 dBm into 50 Ohms
  • Input intercept points: > + 80 dBm (2nd order), > + 52 dBm (3rd  order).
  • Noise figure : < 3.5 dB at 30 MHz
    Static charge protection: DC leak path to ground + a 1 nanosec semiconductor protection + a 10.000 Amp impulse (8/20sec) gas-arrestor
  • Power dissipation amplifier: 4.5 Watts class A ultra linear
  • Dimensions: 1,25 m. height, 1,1 m. diameter
  • Operating conditions: - 30 to + 70 C, can withstand wind speeds up to 160 km/h, completely waterproof
  • Available for 100, 117 or 230 Volts ac mains, continuous use
ALA-1530, Active Loop Antenna


150kHz-30MHz 1m dia. Aluminium Loop
The Wellbrook Active Loop ALA1530 long, medium and shortwave antenna.
This unique broadband magnetic antenna is only 1m diameter and rotatable to provide deep nulls to reject noise and interference. Ideal for users with small gardens... This new broadband untuned Loop antenna is the only active antenna designed specifically to reject locally radiated and mains borne noise from TVs, computers, mains wiring etc.
The Loop antenna responds primarily to the Magnetic-Field and rejects locally radiated Electric-Field noise providing far lower noise reception than active whip/dipole antennas. Compared to active whip/dipole antennas, the Loop will reduce locally radiated noise by up to 30dB and mains borne noise by up to 60dB. The ALA 1530 has 30dB nulls to further reduce interference.
It is ideal for small grounds, indoors and directional reception using an antenna rotator.
The ALA1530 offers significant advantages over the traditional tuned Loop, because the Loop can be used away from local interference. Whereas, a tuned Loop has to be positioned next to the receiver where there are high levels of local noise.
This antenna is probably the most advanced broadband active Loop





BROADBAND LOOP FEATURES
  • Very low intermodulation ensures good performance in a strong signal environment
  • Up to 30dB rejection of locally radiated noise compared to active whip antenna
  • Figure of eight directivity and deep nulls to further reduce interference.
  • Lower noise than indoor tuned loop
  • Ideal for LW and MW with antenna rotator
  • Rejects power line noise
  • Rugged construction, 1m dia. aluminium loop, supplied with Interface and 12 volt PSU
  • No tuning necessary or matching unit
  • No planning problems, works at ground

TECHNICAL INFORMATION

  • Power consumption: 12 volts at 160mA
  • Intermodulation typically (with two signals of 33mV): 2nd order -110dB, 3rd order -133dB
  • Intercept point typically:2nd order +75dBm,  3rd order +41dBm
  • 1dB compression point: +25dBm
  • Output impedance: 50 ohms, BNC Connector

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