The Select-A-Tenna 541-S medium wave [AM] developed for customers who required better performance with some specific applications. These applications have internal ferrite rod antennas that are more difficult than the average radio to obtain good High-Q mutual coupling with the models 541 or 541-M. The 541-S provides the solution to these applications.
The 541-S is an active device with additional controls that has an internal regenerative amplifier and requires a 9 Volt battery (not included). There is a green LED on the front that illuminates when the antenna is turned on. The unit has an additional variable 0 dB to +10 dB gain added to the intrinsic +30 dB for a useful gain up to +40dB. The unit has both Coarse and Fine Tuning controls for ease of operation at the higher gain settings. It also has the capability to effectively drive a remote ferrite probe. This is useful on applications of large case radio installations that the 541-S cannot access directly with it's intrinsic near proximity effect.
The 541-S may be used in any of four different modes:
The 541-S has a high-signal level and low-impedance balanced drive port for the ferrite probe. This provides the capability to not only drive the 6 foot (1.8 m) coaxial cable and probe, which are included, but the cable may be extended to as much as 26 feet using extension cables readily available locally. This is very useful for remotely locating the 541-S away from radio noise sources or into better signal locations, when moving the radio itself may be inconvenient. Select-A-Tennas are approximately 11 inches in diameter and 2.5 inches deep.
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