這PXI國家儀器公司-2558(零件號(hào):778572-58)是廣泛使用的單刀雙擲(SPDT)開關(guān)模塊。這PXI射頻繼電器模塊可以用來增加對(duì)視頻開關(guān)網(wǎng)絡(luò)的適應(yīng)性，或者在組裝高通道數(shù)多路復(fù)用器時(shí)在各種通道上保持一致的信號(hào)路徑。理想交換機(jī)的VSWR等于1。在任何情況下，大多數(shù)時(shí)候，在被路由信號(hào)的頻率下，VSWR為1.8或更小的開關(guān)足以防止信號(hào)源受到損害。交換機(jī)傳輸速度不能用它的VSWR細(xì)節(jié)來標(biāo)識(shí)，這就是以用戶應(yīng)用程序感興趣的頻率在VSWR執(zhí)行項(xiàng)目來解決框架問題的原因。在決定RF應(yīng)用中使用的最佳開關(guān)時(shí)，拓?fù)浜蛿?shù)據(jù)傳輸容量通常是必須考慮的因素。

要使用PXI國家儀器公司-2558切換網(wǎng)絡(luò)時(shí)，用戶應(yīng)遵循以下步驟:

1.檢查特定射頻開關(guān)在用戶應(yīng)用頻率下的插入損耗和VSWR規(guī)格是否符合框架的要求。

2.盡可能避免級(jí)聯(lián)多路復(fù)用器，利用能給出不可分割拓?fù)涞钠骷．?dāng)不可分割的拓?fù)洳豢稍L問時(shí)，則利用SPDT轉(zhuǎn)移和多路復(fù)用器來保證用戶架構(gòu)中所有信道的信號(hào)路徑長度相同，以保持戰(zhàn)略距離，避免信道之間的估計(jì)差異。

The National Instruments PXI-2558 (Part Number: 778572-58) is a broadly useful single-pole double-throw (SPDT) switch module. This PXI RF Relay Module can be utilized to add adaptability to a video switch network or to keep up uniform signal paths over various channels when assembling high-channel-count multiplexers. An ideal switch has a VSWR equivalent to 1. In any case, much of the time, a switch that has a VSWR of 1.8 or less at the frequency of the signal being routed is adequate to keep the source from being harmed. A switch transfer speed is not identified with its VSWR detail, which is the reason that the VSWR execution of the item at the frequency of interest of the user’s application addresses framework issues. While deciding the best switch to use in an RF application, topology and data transfer capacity are normally imperative contemplations.

To use the National Instruments PXI-2558 Switch Network, the user should follow these steps:

1. Check whether insertion loss and VSWR specifications of a specific RF switch at the frequency of the user’s application are in accordance with the necessities of the framework.

2. Try to abstain from cascading multiplexers when conceivable by utilizing items that give inalienable topologies. When inalienable topologies are inaccessible, then utilize SPDT transfers and multiplexers to guarantee that the signal path length for all channels in the user’s framework is the same to maintain a strategic distance from disparities in estimations between channels.