技術公報 Technical Ann.

技術公報-4 12/21/2011

為了服務廣電客戶，『永泰公司』特別斥資採購高單價的精密扭力板手，以確保MOSFET緊密的與散熱片接合，使得MOSFET得以符合原廠handbook所述的散熱品質，進而使MOSFET的使用壽命得以延長。

另外，『永泰公司』也自行開發了一套PA模組的動態測試介面，透過該介面可以將待測模組連接至電腦做即時的多表頭監控，也可經由網際網路以IP的方式做遠端監控。

短時間內，永泰將開放指定客戶登錄web頁面，方便送修客戶參觀動態測試的實況。請大家拭目以待！

* 更換MOSFET專用的扭力板手
 

* 更換MOSFET實況


* PA 模組動態測試軟體


* 監控軟體的多表頭畫面


實測 BE S 系列 PA 模組


* 介面原型在實驗桌上測試的實況

* PA 模組與測試介面的銜接



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技術公報-3 09/01/2011
    BE 原廠日前公佈了BE FXi 60/250 Exciter
的昇級套件FXi 60/250 Exciter Power Supply Q10 Enhancement。

為了提高停斷電時的power supply穩定性，BE建議更換加強型的Q10 FET。(註: 在2011年8月26日以後出貨或者進廠維修的power supply, BE會主動更換此一零件。)

此升級套件除了Q10之外，C58 22uF電容也必須確認，此電容能有效的抑制停斷電時的脈沖波經由U12破壞Q10。在2008年5月19日以前出廠的Fxi60/250此只裝配1uF的電容。在2008年5月19日以後出廠或是進廠維修的Fxi 60/250已更換成22uF電容。

如果您的BE FXi60/250 Exciter有此升級需求，請與我們聯絡02-2796-6587或留聯絡方式以便永泰工程師主動與您聯繫。

技術公報-2 03/15/2011

BE原廠日前公佈了BE FX250C exciter的升級套件。
過去常聽到業界朋友提到FX250C在高溫、高濕的環境下開機、或是停電再來電時會出現 RF fault的現象，導致發射機開不起來！
這個問題已經可以經由BE的升級套件而獲得改善。


若您有這樣的困擾，或者想防範於未然，請留聯絡方式以便永泰工程師主動與你聯繫。

技術公報-1
Nipping Noise in the Bud Jon Titus, Contributing Writer -- Design News, January 1, 2010

When good shielding techniques cannot keep noise from affecting measurements, the following tips can help:

• Use a spectrum analyzer to help identify noise frequencies and amplitudes. Look for harmonics of noise signals and line-power frequencies. This information can help you identify noise sources.

• Separate digital and analog grounds. Use a single-point ground or cluster ground connections as close together as possible to eliminate ground loops. Do not cut off the earth ground (green wire) on a power plug or use a three-wire to two-wire power-outlet adapter to break a ground connection (see photo, below). If you cannot eliminate a ground loop, an isolation amplifier on your signal lines can help.

• Suspect all connectors — even those from high-quality suppliers. Broken, high-resistance or corroded ground connections cause problems and increase the noise on measurement signals. Do not mix high-power conductors and low-level signal conductors in the same cable or wire bundle. Separate measurement and control signals as much as possible. Check screw-terminal connections to ensure tight contact. Use high-quality cable and connectors.

• Keep connectors clean. 3M's Novec contact cleaner removes grease, silicones and dust, and the 407C audio/video head cleaner from MG Chemicals remove oil and dirt. Neither leaves a residue.

• Switch-mode power supplies, motor controllers, electric welders and power-switching equipment can radiate noise. Discharge-lighting equipment and fluorescent-light ballasts can create radiated and conducted noise. You might need to replace old ballasts or install an in-line filter such as the Leviton XPF.

• Use power-line EMI filters to attenuate noise conducted in and out of circuits. Some filters include a choke on the ground line to prevent it from conducting noise, too. I know of a portable-phone battery charger that caused considerable RFI over a wide area due to a faulty component and a poor design.

• Look for coupling between measurement signals and electromagnetic devices such as motors, relay coils and SMPS transformers that have time-varying magnetic fields. Reorient signal leads perpendicular to magnetic fields or move wires away from these fields.

• The electrolyte in aluminum capacitors used in power supplies can dry out and allow noise to pass through to sensitive measurement circuits. If you see line-frequency or SMPS switching noise, look for bad capacitors. It might cost less to replace a bad supply than its bad capacitors.

• Look for slots in chassis and enclosures that can radiate RFI signals. If possible, decrease the slot width with conductive tape that connects to the conductive chassis.

• Use wide-band ferrite cores, or ferrite noise suppressors, on signal cables to attenuate conducted RFI signals.

                                               
Do not remove an earth-ground connection or use a "ground" adapter to break a ground loop. Lack of this ground creates a safety hazard.