The RLA4G is a cross loop receiving antenna for fixed outdoor installation. It operates broadband as a non-tuned active antenna with an integrated amplifier. The power is supplied via the HF cable. The two loops consist of coaxial cables for the symmetrical control of two differential current amplifiers with a low- impedance input. The utilization of the latest components in the two amplifier branches guarantees very low intrinsic noise values and high inter-modulation resistance. The two reception loops are arranged at an angle of 90° to one another. By adjusting the amplifiers, an electronic rotation of the receiving direction is possible. The outer jacket of the antenna elements is grounded on the amplifier housing and shields the actual loops (inner conductor) against interference radiation.
The amplifier is installed in a sealed aluminum housing. The reception diagram is then eight-shaped in the horizontal (bidirectional with 2 wide reception lobes and two sharp zeros).
The RLA4G is not suitable for direction finding. The absolute deviation of the setting compared to the actual reception direction can be several 10°s. The purpose of electronic rotatability is to ensure maximum suppression of interference signals and the cleanest possible reception of useful signals.
Power supply to the RLA4G is only possible via the HF cable ("remote power supply")
Reuter RLA4GS, RAP1
The Reuter RLA4GS is a broadband, non‑tuned HF active loop antenna designed for high‑performance reception from 20 kHz to 30 MHz. It operates using the magnetic loop principle and features two orthogonal loops positioned at a 90° angle, enabling electronic rotation of the receiving direction for optimal signal quality and interference suppression.
Key Facts
- Wideband design from 20 kHz - 30 MHz
- The RLA4GS antenna and the RAP1 preselector can be controlled directly from the RSR200B, as the receiver includes two integrated control units for RLA4 / RAP1 on both HF1/HF2 and VHF inputs
- Weatherproof version for outdoor installation with loops made of coaxial cables
- Shielded loops
- Quick "direction" change in about 100 ms!
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Remote powered & remotely controllable:
– Power is supplied via the HF cable.
– Remote control of rotation is supported (e.g., via Windows app) - Weatherproof outdoor design:
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Reuter has a "No delivery outside the European Union" policy.
shoc offers worldwide delivery.
Overview
Reuter RLA4GS HF Active Loop Antenna (electronically rotatable)
Reuter RAP1
The RAP1 is an active (with amplifier) preselector for radio receivers. It provides preselection to relieve the RX from high sum voltages from wideband antennas. Receivers without sufficient selectivity and input power tolerance thus generate less IM distortion, direct sampling devices ("SDR") require less attenuation. This preselector can also be controlled from the same device as the RLA4GS antenna. Further information after testing the device.
The active preselector RAP1 contains a low-pass filter 0 - 0.5 MHz and 3 bandpass filters, each with 2 circuits, for the frequency range 0.5 - 30 MHz. In addition, active antennas can be remotely powered and the RLA4 antennas can be remotely controlled. An integrated microcontroller allows single-button operation and, with the aid of adjustable gain, automatic correction of the frequency-dependent filter attenuations. Gain reserve can be used as preamplification/attenuation if required.
Technical Data
| Feature | RLA4GS |
|---|---|
| Antenna Unit | |
| Frequency range | 20 kHz to 30 MHz |
| Loop diameter | 770 mm Coaxial cable LMR-400 with RP-TNC |
| Power consumption | |
| IP2 | >= +80 dBm (10.0 MHz + 10.2 MHz -6 dBm measuring tone, 0.2 MHz measured difference tone |
| IP3 | >= +32 dBm (2x -6 dBm measuring tone at 10 MHz |
| Maximum output voltage | >= 1 Veff, 1 dB compression |
| Average noise level (without loops) | <= -145 dBm/Hz (at 10 MHz) |
| Output impedance | |
| Max. Field strength | |
| Weight | < 2 kg (incl. amplifier) |
| Height | 690 mm (incl. Housing) |
| Amplifier dimensions | 140 mm x 60 mm x 120 mm (without connectors) |
| Power requirements | 6.0 V - 13.8 V, maximum +14.4 V max. 80 mA |
| Environmental conditions: | -20 - +40 grd C ambient temperature, <=100 % rel. humidity IP65 (with connected loops and connection cable) |
| Compliance | CE according to DIN EN 55013, EN 55020, EN 60065 RoHS / WEEE Directive, ear-Reg. 27676700 |
| Amplifier Connectors | RP-TNC for loops/node units TNC for antenna feed |
| Control Unit | |
| Dimensions (W x H x D) | 80 mm x 28 mm x 130 mm (without connectors / control elements) |
| Frequency range | 10 kHz - 156 MHz |
| Power supply | 9,0 - 15,0 V- / max. 250 mA |
| Connectors | 2 x BNC 50 Ohm 2.5 mm x 5.5mm Hollow Pin SMA female for WLAN |
| Maximum cable length from control unit to antenna | max. 10 ohm DC resistance |
| Weight | < 500 g |
| Environmental conditions: | 0 - +40 grd C ambient temperature, <=90 % rel. humidity IP65 (with connected loops and connection cable) |
| Compliance | CE according to DIN EN 55013, EN 55020, EN 60065 RoHS / WEEE Directive, ear-Reg. 27676700 |
| Control | Antenna: Slow serial communication over anten cable |
| Remote control | Windows App, WLAN API |
| RAP1 Preselector | |
| Filters | Low-pass filter 0 – 0.5 MHz: Fixed filter with lower cut-off frequency by 2 serial 22 μF capacitors Bandpass filter 0.5 – 1.9 MHz Bandpass filter 1.9 – 9 MHz Bandpass filter 9 – 30 MHz Filer Off, 0-30 MHz (typ. Min 100 MHz) |
| Adjustments | Level ( 0.5 dB steps) Frequency (10 kHz steps) |
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RLA4GS shoc reinforced
