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Listo de historiaj eventoj | Aktualaĵoj ◄ | 17-a jarcento | 18-a jarcento | 19-a jarcento | ► ◄ | 1670-aj jaroj | 1680-aj jaroj | 1690-aj jaroj | 1700-aj jaroj | 1710-aj jaroj | 1720-aj jaroj | 1730-aj jaroj | ► ◄◄ | ◄ | 1702 | 1703 | 1704 | 1705 | 1706 | 1707 | 1708 | 1709 | 1710 | ► | ►► Ĉi tiu jaro estas normala jaro komenciĝanta vendrede (ligilo montras kalendaron). 1706 en la aliaj kalendaroj Gregoria kalendaro 1706 MDCCVI Ab urbe condita 2459 Armena kalendaro 1155 ԹՎ ՌՃԾԵ Bahaa kalendaro -138 – -137 Barataj kalendaroj  - Vikram Samvat 1761 – 1762  - Barata nacia kalendaro (Shaka Samvat) 1628 – 1629  - Kali Juga 4807 – 4808 Budhisma kalendaro 2250 Ĉina kalendaro 4342 / 4402 – 4343 / 4403 乙酉 – 丙戌 Etiopa kalendaro 1698 – 1699 Franca respublika kalendaro -86 - -85 Hebrea kalendaro 5466 – 5467 Holocena kalendaro 11706 Irana kalendaro 1084 – 1085

4 1 $begingroup$ I often find a thru cal on RF PCB like picture below. What is the purpose of having this thru cal thing on the board? One purpose I can think of is to test whether the designed transmission line is truly 50 ohms over the frequency of interest. I did some research online and there are some people saying that the purpose of this thru cal is for "through-reflect-line" (TRL) testing. But I was not convinced with this argument since TRL technically needs other two lines (reflect and line). Can anyone explain this to me from their experience? pcb rf share | improve this question asked 2 hours ago