The RFA1A is an active ferrite antenna with frequency tuning in the range 130 kHz to 11 MHz. It has an adjustable Q factor with fully electronic tuning and can be remotely fed and controlled via the HF cable. Autonomous operation with a battery is possible.
The RFA1 allows continuous one-button tuning over a relatively large frequency range thanks to its microprocessor design without the need to manually switch between ranges or to switch antenna modules. An illuminated LC display is installed for display purposes.
The reception voltage of the built-in ferrite rod is amplified with a low-noise amplifier (SFET/OpAmp cascode) and output to a standard 50 Ohm BNC connection. A quality multiplier circuit allows the bandwidth and output level to be varied.
The antenna is designed for indoor use in heavily noisy surroundings. It can either be supplied with power autonomously from an installable battery, a DC hollow pin socket or via the HF cable. Using the power supply via the cable allows for remote control of the tuning and quality setting from a control unit or suitable receivers.
The housing is made of robust ABS with an anodized and printed aluminum front panel. The coil of the ferrite rod and the electronics are shielded internally.
The main reception range with high reception levels includes the LW, MW and lower SW range. The antenna voltage decreases steadily in the higher SW range. To improve reception in this range, an auxiliary antenna (rod, short wire) can be connected, which acts as a tunable, selective “electrical” antenna.
The RFA1 operates with 55 g of ferrite material. When compared with other ferrite antennas, the use of material and the achievable frequency range must be considered. Especially when used in a low-noise environment, the internal noise of the RFA1 can be higher than the external noise and other designs can deliver better results.
New: Also deliverable als weatherproof outdoor version RFA1B!