. Brand New 180.00

Dave W9MPD

702-294-2666


This is the latest addition to the Select-A-Tenna product line. It was 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 Model 541or 541-M. The 541-S provides the solution to these applications.
(See application illustration below)

The 541-S is an active device with additional controls that has an internal regenerative amplifier and requires a 9V battery (Not included). The unit has an additional variable 0dB to +10dB gain added to the intrinsic +30dB 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:
(1) Direct Near Proximity just like the
541 and 541-M.
(2) Ferrite Probe Near Proximity.
(3) Direct Wired Antenna Connection.
(4) External Antenna and Ground for
metal-buildings when using
modes 1 and 2.

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 ft. coaxial cable and probe, which are included, but the cable may be extended to as much as 26 ft 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