133
edits
No edit summary |
(Start of a big internal picture series for the 7L18) |
||
Line 1: | Line 1: | ||
[[Image:7L18-front.jpg|600px|center]] | |||
The Tektronix 7L18 is a spectrum analyzer plug-in [[introduced in 1978]] for [[7000-series scopes]]. | The Tektronix 7L18 is a spectrum analyzer plug-in [[introduced in 1978]] for [[7000-series scopes]]. | ||
It occupies three plug-in bays in the oscilloscope. | It occupies three plug-in bays in the oscilloscope. | ||
It covers the range from 1.5 GHz to 18 GHz with the internal mixer and 12.5 GHz to 60 GHz | |||
using external mixers. | |||
Note that it will NOT do 1.5 to 18 in one span, it will only max span | |||
the range selected by the BAND/HARMONIC control. | |||
This range is determined by the hetrodyne harmonic number and sign (sideband) and | |||
the range of the first LO, which is 2 GHz to 4 GHz. | |||
The input attenuator range is 0 dB to 60 dB in 10 dB steps and is a standard Wenschel Engineering | |||
product driven by a belt. The range is encoded for the digital dBm reference level display. | |||
The signal then passes through a YIG preselector filter with a 50 MHz bandwidth. | |||
After the YIG filter, the signal enters the RF input of the mixer assembly. | |||
The LO is a YIG tuned oscillator covering the 2 GHz to 4 GHz range. It's output passes | |||
through a sampler assembly used to PLL the YIG on small resolution bandwidths. | |||
The output of the sampler goes to the LO input on the mixer. The mixer IF output | |||
is 510 MHz. | |||
[[List of manuals that are needed|Manual needed]] (with schematics). | [[List of manuals that are needed|Manual needed]] (with schematics). |
edits