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• Comprehensive Built-In-Test(BIT)
  復雜的內部測試(BIT)
• Selectable Gain. 
  選擇性增益
• Automatic Protection Mode During RF Overload.
  在射頻超載的情況下，啟動自動保護模式
  
• Automatic switching between Preselector and Postselectoe Modes for use with Transceivers.
  為收發信機使用提供預選與后選模式自動切換
  
• 1.75"x19" Rack Mount Package.
  1.75"x19"的可上機架機箱

　　The PPS-100 Pre/Postselector permits operation of co-located receivers and transmitters on frequencies separated by as little as 10%. When used with receivers, the unit functions as a preselector, providing an additional front end selectivity stage. This reduces the receiver desensitization and overload that would normally occur in the presence of strong adjacent RF transmissions. The unit is used as a postselector with transmitters. It rejects spurious outputs and broadband noise in the transmit signal before it reaches the power amplifier, thereby limiting interference to neighboring receivers. The PPS-100 performs both functions with a transceiver; it follows the radio's keyline and swithes between the preselector and postselector modes.
PPS-100預/后選器允許并將接收機和發射機的頻率以小到10%來劃分。當配合接收機使用時，該裝置的功能作為一臺預選器，提供一個額外前端選擇階段。這樣就可以避免在出現鄰近的射頻的強烈發射時，通常會造成接收機的敏感度降低和超負荷運作。當配合發射機使用時，該裝置則作為一臺后選器。它將發射信號送達電源放大器以前，抑制其中的假輸出信號和寬帶噪音，以減少與鄰近的接收機之間的干擾。PPS-100可同時為一臺收發機提供以上兩項功能，它伴隨著無線電的KEYLINE，在預選和后選模式間切換。

　　The PPS-100 operates from 1.6 to 29.99 MHz. The unit offers a selectivity of 40 dB typical at 10% from the nominal tuned frequency, with an ultimate rejection of 70 dB typical. The input and output both have a norminal in-band impeddance of 50 ohms.
PPS-100在1.60至29.99MHz之間運行。該裝置在銘牌規定的調諧頻率范圍內以10％的增長提供典型的40dB抑制，并可抑制高達典型的70dB。輸入和輸出均具有50ohms的阻抗。

　　The unit accepts frequency input 10 kHz increments, automatically tracking the radio's operating frequency via either serial (RS-232/422) or parallel BCD frequency information from its companion radio. Tuning time is 10 milliseconds maximum, making the PPS-100 suitable for Automatic Link Establishment (ALE) or Adaptive Applications. No octave or sub-octave filters are used.
該裝置允許頻率輸入10k Hz的增量，從其通過其無線電的串口(RS-232/422)或其配對電臺的并行BCD頻率信息自動跟蹤無線電操作頻率。最大調諧時間為10毫秒，令PPS-100能夠適應自動鏈路建立(ALE)或適應性應用。沒有使用八音階或副八音階濾波器。

　　The Pre/Postselector offers two levels of gain; the level may be selected remotely or via the unit's front panel. The unit enters a Protection Mode whenever there a Protection Mode whenever there is an extreme RF overload. In this mode, the antenna port is open circuited, while the unit's internal input is grounded. A Bypass Mode can also be selected either via the front panel or remotely; the unit automatically switches to this mode while the internal self-test is in progress and when it is controlling radio switches to a frequency outside of the 1.6 to 30 MHz coverage range. Front panel LEDs signal the unit's present operating mode.
該預選器/后選器提供了兩種電平的增益，電平的選擇可通過遙控或前面板進行。一旦遭遇射頻超載，該裝置將進入保護模式。在該模式下，天線端口為開放電路，而該裝置的內部輸入則為接地。旁路模式也可通過前面板或遙控加以選擇，該裝備在自檢過程和控制外部1.6至30MHz覆蓋頻率的無線電切換時，將自動切換到該模式下。前面板上的LED顯示了該裝置的目前操作狀態。

　　The PPS-100 is housed in a 1.75"x19" rack mount package. Standard opaeration is from 115/230 VAC or from 12/24 VDC.
PPS-100包裝于一個1.75"x19"可上機架的機箱內。在115/230VAC和12/24VDC下進行標準操作。