The RLA4 is a broadband, non-tuned receiving antenna for the LW to SW range based on the magnet loop principle. It possesses 2 loops that are arranged at an 90° angle to each other with electronically switching / rotating option of the receiving direction.
The antenna loops of the RLA4 are made of specific multilayered circuit board material with protective coating, flexible stainless steel strips or of coaxial cable. In conjunction with the highly sensitive and low-resistance amplifier inputs, a high cutoff frequency is achieved.
The antenna loops are relatively small but achieve good receiving levels in conjunction with the low-noise amplifiers. Thus, the small and light antenna can be used flexibly. The low-resistance magnet loop principle and the direct and centered grounding of the loops (completely symmetrical structure of mechanics and electronics) result in a very low noise sensitivity.
Different control units for the antennas are available which enable remote supply through the HF cable and electronic fine adjustment (rotation) of the receiving direction.
For the setup of own designs, the amplifier board of the RLA4 is also separately available, currently in version RLA4H with very low-noise and IM resistant electronics.
The RLA4 antenna is available with 14.17 in (36 cm) or 19,69 in (50 cm) loops mostly from stock. Different versions of the loops are available for indoor or outdoor use: Shielded and unshielded version, as well as stainless steel strip.
Review of the RLA4: RLA4E_RadioUser.PDF
New: RLA4G, weatherproof version for outdoor installation with loops made of coaxial cables.