When installed on the forward bulkhead, where forward-looking pattern coverage is unimpeded, the N4-26 will provide significantly better performance (for Localizer functions) than any tail-mounted VORLOC antenna. Furthermore, this installation technique greatly extends the service life of the antenna since it is protected by the aircraft’s radome.
The center-fed loop design of the N4-26 outperforms most dipole based Localizer antennas by providing significantly better resistance to cross-polarized signals (thus improving ILS accuracy) and a broad, amplitude-stable pattern lobe. The center-fed loop design also eliminates any sensitivity to the motion of the weather radar assembly.
An integrated coupler provides isolated, redundant, RF outputs allowing use of one antenna with two NAV receivers.
L3Harris recommends the N4-26 for installation such as Air transport aircraft where tail-mounted VORLOC antennas may not provide satisfactory Localizer performance. In general, a tail-mounted VOR antenna will be used in conjunction with the N4-26 to provide optimum VOR signal reception.
