So, does that mean the aircraft nose has been demoted to a superfluous, hollow space.? Nope, far from! I decided to stick my nose into KLM Engineering and MaintenanceвЂ™s business to find the answer to the question that has been occupying me for ages: What exactly is hidden in the nose of an aircraft? These days, aircraft get their thrust from jet enginesunder the wings. The aeroplane had a large propeller just in front of the engine mounted on the nose. In this configuration, at lower frequencies the discone may more closely resemble a ground plane antenna or a coaxial dipole.Save Saved Save for later Saved for later When KLM operated its first flight in 1920, it used a De Havilland DH.16. The discone's inherently wideband nature permits it to broadcast undesirable spurious emissions from faulty or improperly filtered transmitters.Д®xtending low-frequency response ДЄ vertical whip may be affixed to the center of the disc in order to extend the low frequency response, but this may compromise efficiency at higher frequencies. The discone's wideband coverage makes it attractive in commercial, military, amateur radio and radio scanner applications. The optimal number of rods comprising the disc and cone is often quoted as being from 8 to 16. The spokes may be made of stiff wire, brazing rods or even coat hanger wire. Mounted discone antenna designed for VHF and UHF coverage. This simplifies construction and reduces wind loading. The insulator: The disc and cone must be separated by an insulator, the dimensions of which determine some of the antenna's properties, especially on near its high frequency limit.ДЄ discone may be made from solid metal sheet (often copper), which is practical for small indoor UHF antennas, such as for Wi-Fi.ДЄt lower frequencies a sufficient number of metal wires or rods in a spoke configuration is often used to approximate a solid surface.The cone angle is generally from 25 to 40 degrees. The cone: The length of the cone should be a quarter wavelength of the antenna's lowest operating frequency.It is usually fed with 50-ohm coaxial cable, with the center conductor connected to the disc, and the outer conductor to the cone. The antenna's feed point is at the center of the disc. The disc: The disc should have an overall diameter of 0.7 times a quarter wavelength of the antenna's lowest frequency.A discone antenna consists of three main parts: the disc, the cone, and the insulator. SWR ( standing wave ratio) is typically 1.5:1 or less over several octaves of frequency. When employed as a transmitting antenna, it is often less efficient than an antenna designed for a more limited frequency range. The discone antenna has a useful frequency range of at least 10 to 1. In accordance with my invention I have provided a small rigid antenna suitable for mounting on the surface of the fuselage or other component of the airplane structure and in certain embodiments I have also provided a streamlined protecting shield or housing covering or so cooperating with the construction of the antenna system as to greatly reduce wind resistance. Flying conditions are such that these antennas must necessarily be small and rigid in their construction and also offer a minimum of wind resistance, in order that the flying efficiency of the aircraft will be unimpaired. In keeping with progress made during the last few years in the development of ultra-high frequency radio technique, and applications thereof to aircraft communication, direction finding, and so forth, it has become necessary to develop special antennas and antenna systems suitable for installation on such aircraft. patent number US 2368663 'Broad band antenna' (assignor to Federal Telephone and Radio Corporation, later merged with ITT Corporation), from an application made on May 15, 1943. Kandoian of New York City was awarded U.S.

Klm antenna