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NDB and effective solutions

. Such as AM radio stations, radio paging, mobile communications, interference, as long as these sources of interference from the navigation station, on the impact of NDB little jitter. Another example is the lightning signal and a very wide spectrum of electromagnetic interference, although it is relatively large NDB jitter, but it is only a transient disturbance, the navigation will not pose threat to aircraft. 3 aircraft instrument itself and other reasons exist for this reason the error is not the scope of this column, not to elaborate too much on this. 4 ways to further improve the jitter NDB environment to meet the requirements for the station, the antenna is also perpendicular to the ground segment BO, top load point B is also the middle section of the NDB navigation AC units, such as the jitter is still flying school standards, the following methods to try to further reduce the jitter level. (1) reduce the NDB transmitter frequency, the wavelength growth. Using long-wave features to enhance the navigation signal around more mountains and other large obstacles 512 004 No. 1 (Total 33) Guilin College of Aerospace JOURNALOFGUILINCOl1, FGEOFAEROSPACETECHNO [/ Smile

GY hinder the ability of objects, to reduce the reflected signal Great cause jitter. Drawback of this method is the need to continue to carry out the school to reduce flight frequency, high cost, long cycle, and reduce the frequencies to be re-tuned, etc.,[link widoczny dla zalogowanych], and the other procedures may have more to be carefully used. (2) increase or decrease transmission power: from the theoretical analysis, can reduce the transmission power of the reflected signal distant objects have a certain inhibition. Guilin Airport South Super author Yuan-tai (mountains) in flight school has this method. Effect though not obvious, but the external environment is different each navigation station can also try. This method is quick to adjust equipment without re-tuning the transmitter. (3) Check the grounding resistance: NDB ground network serves to reduce the antenna losses and increase the efficiency of the transmitting antenna. The plains require grounding resistance is less than 2 ohms, in the mountains requires less than 4 ohms. Measured by grounding resistance should be dug to the root of radiation at the end of a network connection tester,[link widoczny dla zalogowanych], and the current pile, pile voltage required intervals and to network with a linear arrangement of two dozen outside the walls, a few more test ground network end points to the average subject. Do not test piles to play in Taiwan on the mainland network. If the ground resistance high resistance measures should be taken down. (4) to replace or add a layer of clay in the ground-line: If the land line for the sand, etc.,[link widoczny dla zalogowanych], should consider replacing the higher conductivity of humus or clay,[link widoczny dla zalogowanych], or assisted in the original basis plus a layer of clay 30 cm thick, ground network to improve the depth of the surface conductivity of the earth man-made improvements to reduce the antenna loss. The disadvantage of this method is the heavy workload, but the school has been unsatisfactory flight jitter is too large navigation station off Taiwan, is also available for reference use of the law. (5) days to make the appropriate adjustments fed lightning: ① I have come close to Guilin Airport North NDB navigation station antenna of a company in the installation of lightning protection devices, the RF power is high and sometimes low 52 oxidization / text as the same time The \Recommend the school to fly a large navigation station jitter, flight school to try to remove antenna lightning protection devices, to avoid being the poor quality of the RF antenna and lightning protection of local short-circuit transient signals frequently come down to earth, resulting in increased jitter NDB. ② Guilin Airport South Super distant station from 96 to 99 years, opening in early October, reflecting the large number of flights NDB large jitter,[link widoczny dla zalogowanych], especially in the rainy days even more, the device often \work. I do equipment checks to the navigation station found that the original tip antenna discharge gap is too small, resulting in cloudy, rainy days when the signal is frequently transient Shimoji, when the radiated power caused by instability of large, sometimes small, so that flight jitter substantially. Adjusted discharge gap distance, the problem is resolved. Visible, caused by lightning device is one of the important reasons NDB jitter. In short, the reasons causing NDB Generally, the jitter, jitter big problems to solve the above-mentioned one or two methods may not be solved, or all may be together a variety of methods used to solve the problem. Sometimes some very modest \Therefore, we are required every navigation and technical personnel in solving difficult technical problems of the NDB jitter, we should all-round, multi-perspective problems, do not arrest in a mind unable to extricate themselves. Usually on duty, hard-working staff to develop navigation technology, a highly responsible manner, not only to carefully inspect equipment, antenna systems, lightning protection system is normal, but also look to Taiwan within the scope of 2, with or without terrain, terrain anomalies pay attention to observe, identify problems and timely report to the higher and timely solution. NDB jitter may cause the reason nipped in the bud to ensure NDB jitter tolerance range, to ensure that the navigation accuracy to ensure flight safety.
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