EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: doktor pyta on May 15, 2014, 10:47:14 pm
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Older HP's scalar network analyzers can often be found on Ebay auctions at low prices.
Unfortunately, lot of them are sold without (or with defected) microwave detector probes.
I want to present simple project made few years ago. It allows to replace expensive HP 11664A detectors.
You wil need:
- easy-to-get microwave detectors* such as "Hewlett Packard HP 33330B DETECTOR POSITIVE 0.01-18 GHz"
- circuit described in pdf file below
- a piece of shielded RG174 coax (for modulated signal path)
- 3-wire cable to provide +/- supply and ground return
- "C091-3374-501" Amphenol 5-pin connector
*positive and negative output detectors can be used.
Use proper resistor for diode biasing (R8 for posititive output detectors; R4 for negative output detectors)
The performance is similar to 11664A detector. It will be sufficient for most HAM radio DIY applications.
Some helpful pictures on http://rfscientific.eu/hp-11664a-diy-probe-replacement (http://rfscientific.eu/hp-11664a-diy-probe-replacement)
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Nice! It is essentially an HP 11664C adapter. The headache is that you need to calibrate it with a power meter first and every time you change the detector.