Design Of The Flight Communication System Control Panel Test Board

With the rapid development of aviation, aviation electronic equipment is more and morecomplex, test repair work is becoming more and more heavy.Airlines constantlydevelopment design accord with their maintenance ability of high frequency communicationsystem, optimize the maintenance plan and strengthen the maintenance personnel training.Inorder to make the aircraft communication system more personalized control panel test boarddesign, the maximization of the maintenance personnel to improve the level of maintenance,cost will not beyond the scope of the budget at the same time, the self-made test usingdiscrete function interface components has become an important means of aviationelectronic equipment maintenance company, the maintenance work of airlines smoothly hasfar-reaching significance.Around the high frequency communication system, this paper centered on civil aviationhigh frequency communication control board to design a system, through the improvementof high frequency communication control board, to realize the depth of maintenance and testfunction and high quality communication function.Now although the civil aviation plane is equipped with a variety of types ofcommunications equipment, but in the actual empty empty, empty a communicationsapplications, the VHF communication is preferred, the most important way ofcommunication.But due to the special nature of VHF communication that airborne VHFequipment vulnerable to all kinds of interference, leading to the communication of emptyshelves with empty one is blocked, at the same time also led to the suspension of the groundmonitoring data, serious impact on the aircraft flight safety.This paper studies the principle of airborne VHF signal propagation in the process ofcommunication, a variety of possible interference, including natural factors, such as terrain,environment and atmosphere for communication between the system and the influence ofelectromagnetic wave interference, such as: the station interference, sidelobe interference,intermodulation interference, stray interference, etc. In high frequency communication control board, for example, in combination withworking practice, design and production test bed. This paper first on China’s aviationelectronic accessories maintenance, high frequency communications to civil aviation controlpanel functions are analyzed in detail.And introduced the ARINC-429data bus. Secondly,in view of the high frequency communication design depth test bed for maintenance, indetail elaborated the test process and design work order process, at the same time, the designof high frequency communication control panel test bed test work order.Finally, a simpleanalysis of the common faults and processing methods, it is concluded that high frequencycommunications panel test bed can rapidly to high frequency communications panel fortesting, in maintenance training is very practical.The following key on the main function of high frequency communication control paneltest bed is introduced and analyzed.First of all, the first G7401-06of high frequency communication control panel isintroduced, its main function has the following three points.High frequency communication on the control panel set up two hf transceiver, remoteadjustment one, make its compatibility, used as a user selected frequency.When selectingmode is upper sideband (USB) or amplitude modulation (AM) modulation, can remotecontrol for hf transceiver operation. The sensitivity of radio remote control transmittingfrequency is associated with high frequency transceiver.Second, compatible device is designed to be mediated ARINC-719high frequencycommunications systems and ARINC-429serial data bus structure, as long as meet itsdefinition, can make full use of the ARINC-429data bus for transmission.Third, high frequency communications systems have a mechanical input mode, namelyG7401-06hf communication control panel can receive user input frequency selection knobon the front panel of the frequency, mode selection knob "closed/usb/am" can select themodel and radio frequency sensitivity of the potentiometer. Through the J1connector,control panel discrete signal can be received.Fourth, G7401-06hf communication control panel interface connected to interface ofhigh frequency receiver, and the main effect is embodied in the following two points.According to G7401-06control panel interface and high frequency high frequencycommunication interface to the details of the receiver, the high frequency control panel canbe controlled through a serial of32words a high frequency receiver.ARINC-429datacontent can adjust the high frequency communication receiver and the frequency of the userto select, and whether it is also the cause of the switch working mode.(work modes: usb andmodulation mode)Fifth, under normal operation, the output of high frequency communication controlpanel is fixed time intervals and output, the output of the content contains the content of theARINC-429data bus, frequency tuning frequency, operating mode and other datacontent.G7401-06of high frequency transceiver of high frequency communication controlpanel interface is based on figure2.1ARINC-429interface.Similarly, according to the maintenance manuals and other information, also can makeother airborne electronic system panel test bed.This article refer to the aircraft maintenancemanual (AMM) and component maintenance manuals (CMM), the structure and parametersof airborne VHF communication system equipment, through concrete practical fault onairborne VHF communication support for research, the structure of the airborne VHFcommunication equipment, environment, etc., quoting examples to research and analysis ofall aspects of the VHF, effective solutions and measures are put forward.Designed a VHFpanel test bed, greatly save the cost in the process of test, improve the efficiency.