5T3: Difference between revisions

5T3 (view source)

583 bytes added , 9 June 2023

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 It uses [[TD253|TD253B]] [[tunnel diodes]] for triggering.
-It has a high-impedance external trigger input that is buffered by an [[8056]] [[nuvistor|Nuvistor]] cathode follower.
+The 5T3 can be triggered from any of four different sources:
-The 5T3 also has a 50 Ω external trigger input with no buffering stage.
+# Internal trigger from the sampling plug-in, interconnect J9.
-This low-impedance trigger input is capable of operation up to 5 GHz.
+# Internal trigger from the calibrator module in the 661 mainframe.
+# External trigger to the high-impedance BNC trigger input. This input is buffered by an [[8056]] [[nuvistor|Nuvistor]] cathode follower.
+# External trigger to the 50 Ω [[GR-874]] trigger input. This input has two different modes:
+## a conventional Schmitt trigger with 500 MHz bandwidth that skips the high-impedance Nuvistor input buffer but is still buffered by Q64 and Q124 (1 GHz NPN transistors, part number 151-0138-00, 2N2857) before the tunnel diode trigger event recognizer circuit.
+## a passive low-impedance path, capacitively coupled to a tunnel diode for "UHF SYNC" mode, which works up to 5 GHz.
+The 5T3 can also be set to free-run mode.
 {{MissingSpecs}}