Microwave Converter

Model 11793A

3.Safety Considerations

This product is a Safety Class I instrument; that is, one provided with a prctective earth terminal. The Microwave Converter and all related documentation must be reviewed before operation for complete familiarization with safety markings and instructions. Refer to the Safety Considerations page found at the beginning of this manual for a summary of the safety information. Safety information pertinent to the task at hand (that is, installation, operation, performance testing, or service) is found throughout this manual.

4.Instruments Covered by This Manual

This instrument has a two-part serial number. The first four digits and the letter comprise the serial number prefix. The prefix is the same for all identical instruments; it changes only when a change is made to the instrument. The last five digits form a sequential suffix which is unique to each instrument. The contents of this manual apply directly to instruments having the serial prefix listed under Serial Numbers on the title page.

An instrument manufactured after the printing of this manual may have a serial prefix that is not listed on the title page. This unlisted serial prefix indicates that the manual for this instrument is supplied with a Manual Changes supplement that documents the differences.

In addition to change information, the supplement may contain information for correcting errors in the manual. To keep this manual as current and accurate as possible, Hewlett-Packard recommends that you periodically request the latest Manual Changes supplement. The supplement is identified with the manual print date and part number that appear on the title page. Complimentary copies of the supplement are available on request from your nearest Hewlett-Packard office.

For information concerning a serial prefix not listed on the title page or in the Manual Changes supplement, contact your nearest Hewlett-Packard office.

5.Description

The HP Model 11793A Microwave Converter down-converts microwave input signals in the range from

1.3to 26.5 GHz. For frequencies below 1.3 GHz, signals are routed directly to the input of the measuring instrument. Instruments suitable for lower frequency measuring are the HP 8901B Modulation Analyzer or the HP 8902A Measuring Receiver.

For input signals above 1.3 GHz, the Microwave Converter routes the signal through an internal mixer which mixes the input signal with an external local oscillator. The difference frequency (that is, the intermediate frequency or IF) is filtered, amplified, and then appears at the IF OUTPUT connector. The IF should be between 10 and 700 MHz.

The Microwave Converter requires a +8 dBm leveled output from the LO. For LOs with insufficient power above 18 GHz, an optional internal amplifier (1 8 GHz to 26.5 GHz) is available. The measuring instrument controls switching of the RF path and of the LO amplifier via a rear-panel connection on the Microwave Converter.

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