Teardown, Analysis and Part-Salvage from an HP 70001A Series Optical Microwave Analyzer

In this episode Shahriar performs a teardown and analysis of several HP 70000A modules. The modules include a 20GHz optoelectronic converter, 2.9GHz tracking generator, 10MHz/100MHz precision reference and a 22GHz spectrum analyzer.

Along with the teardown of these modules several microwave components are recovered for future use including amplifiers, VGAs, mixers, photo detector and OCXOs. The 22GHz spectrum analyzer module is preserved since it is simply too beautiful to destroy.


  1. armin says:

    Hi Shahriar
    When will you have a teardown and analysis video on hp 20GHz optoelectronic switch?

  2. Matt says:

    Hi Shahriar,

    The reason for the external power supply input on the 70310A frequency reference is to maintain power to the oscillator oven while the mainframe shelf is powered off. So, the oscillator is always thermally stabilized and ready for use.

    HP sold a small, external power supply module that bolted on the back of the mainframe shelf. This module provided the 40 VDC required for the external power input.

  3. Gary says:

    Hey Shahriar,
    do you still own the plug-in HP70908A? If yes, is it still in good condition and would you be interested in selling it? I’m currently looking for one of those…

  4. Roger says:

    I bet you felt really guilty after dismantling that beautiful piece of equipment.
    You have to break a couple of eggs to make a cake though.
    Great teardown and thank you.

  5. Steve says:

    I would be very interested in seeing characterization of the various modules that you salvaged from the 70001A, along with a discussion/tutorial of the characterization methods and techniques. While I was watching the original video, I was hoping we would get to see some of that. Alas, there was no time…

  6. Sven says:

    Do you take offers for the RF section? 🙂

  7. Mitch says:

    Absolutely wonderful and instructive video, Shahriar! And your expertise in electronics is only exceeded by your artistic sense … a splendid choice to keep the last module fully intact. A unique and artful conversation piece, and a testament to mechanical and engineering design. And what great fun to watch you … like a child opening and endless supply of Christmas presents. Your excitement is infectious. Thank you!

  8. robert rannin says:

    All the microwave plumbing is indeed a work of art! As usual, your videos are better than most $500/credit hour lectures. i wish i knew where that dumpster is located!

  9. Paret Erik says:

    This 70000 series in the teardown was in the 1992 catalog as lightwave analyser 71400C ,
    sold in a package for 101.000 US$ without VAT !
    which would be 167.000 in 2014 according to the inflation calculator ,


  10. Daniel says:

    Great Video.
    Please, please do a tutorial on PLLs, that would be great.

  11. Leonid says:

    Can’t believe the fine hand built circuits. Thanks

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