39,344
edits
No edit summary |
(sidebar) |
||
Line 1: | Line 1: | ||
{{Plugin Sidebar| | |||
The Tektronix 7L18 is a spectrum analyzer plug-in [[introduced in 1978]] for [[7000-series scopes]]. | title=Tektronix 7L19| | ||
It occupies three plug-in bays in the oscilloscope. | summary=18 (60) GHz Spectrum Analyzer| | ||
image=7L18-front.jpg| | |||
caption=Tektronix 7L18| | |||
years=?| | |||
type=combined horizontal/vertical plugin| | |||
series=[[7000-series scopes]]| | |||
manuals= | |||
[[List of manuals that are needed|Manual needed]] (with schematics). | |||
[[Category:Manual needed]] | |||
}} | |||
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. | |||
The 7L18 covers the range from 1.5 GHz to 18 GHz with the internal mixer and 12.5 GHz to 60 GHz | |||
using external mixers. | using external mixers. | ||
Note that it will NOT do 1. | Note that it will NOT do 1.5 GHz to 18 GHz in one span, it will only max span | ||
the range selected by the BAND/HARMONIC control. | the range selected by the BAND/HARMONIC control. | ||
This range is determined by the | This range is determined by the heterodyne harmonic number and sign (sideband) and | ||
the range of the first LO, which is | the range of the first LO, which is 2 GHz to 4 GHz. | ||
The input attenuator range is | The input attenuator range is 0 dB to 60 dB in 10 dB steps and is a standard Weinschel Engineering | ||
product driven by a belt. The range is encoded for the digital dBm reference level display. | 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 | 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. | 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. | The LO is a YIG tuned oscillator covering the 2 GHz to 4 GHz range. Its output passes | ||
through a sampler assembly used to PLL the YIG on small resolution bandwidths. | 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 | The output of the sampler goes to the LO input on the mixer. The mixer IF output | ||
is | is 510 MHz. | ||
==Pictures== | |||
Service views: | Service views: | ||
Line 27: | Line 38: | ||
Image:7L18-service-rightfront.jpg|Service setup for the right front panel | Image:7L18-service-rightfront.jpg|Service setup for the right front panel | ||
</gallery> | </gallery> | ||
Boards within the digital card cage (from back to front): | Boards within the digital card cage (from back to front): | ||
Line 46: | Line 56: | ||
</gallery> | </gallery> | ||
The | The microcomputer board is built using three very old Intel chips: an Intel 4004 processor, | ||
an Intel 4002 320 bit RAM and 4 bit output port, and an Intel D4289 standard memory | an Intel 4002 320-bit RAM and 4-bit output port, and an Intel D4289 standard memory | ||
interface. The D4289 connects the 4004 to the two | interface. The D4289 connects the 4004 to the two 2K8 ROMs. Note that in an earlier | ||
version of the 7L18 there were 6 ROMs. | version of the 7L18 there were 6 ROMs. | ||