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7L18: Difference between revisions
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It occupies three plug-in bays in the oscilloscope. | 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 | 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 1.5 GHz to 18 GHz in one span, it will only max span the range selected by the BAND/HARMONIC control. | ||
Note that it will NOT do 1.5 GHz to 18 GHz in one span, it will only max span | This range is determined by the heterodyne harmonic number and sign (sideband) and the range of the first LO, which is 2 GHz to 4 GHz. | ||
the range selected by the BAND/HARMONIC control. | |||
This range is determined by the heterodyne 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 Weinschel Engineering | 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. | ||
product driven by a belt. The range is encoded for the digital dBm reference level display. | 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. | 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. Its output passes | The LO is a YIG tuned oscillator covering the 2 GHz to 4 GHz range. | ||
through a sampler assembly used to PLL the YIG on small resolution bandwidths. | Its 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 | The output of the sampler goes to the LO input on the mixer. The mixer IF output is 510 MHz. | ||
is 510 MHz. | |||
==Specifications== | ==Specifications== | ||
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7L18-sampler.jpg|Internal of the LO sampler | 7L18-sampler.jpg|Internal of the LO sampler | ||
</gallery> | </gallery> | ||
{{Custom ICs|7L18}} | |||