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Hi Jeff,

Thanks for the info, very interesting.

Both devices test good on the diode range of the 34401A, next test is to see what I can do with them

I have a Tek ext mixer on its way to me and I should be able to put that on the 8566B and see something, I hope so anyway.

cheers

Tim

Tim,

The other device was made by ADTECH as you noted, later ECI, which was bought by Alpha Microwave (when Control Data owned them) and became the basis for their MMW mixer line. My first boss at Westinghouse Defense was one of the principles at ADTEC (all came from Johns Hopkins, including Merrill Skolnik and other notables). Really innovative MMW company in the early 60's.

IIRC, uses a MMW flat cartridge crystal, point contact type with a hand pointed Tungsten whisker (using HF) made by Frank Trageser (only guy who could do them right...).

If the diode tests good with a ohm-meter for some sort of front to back ratio then you are in business. Use typical precautions.? Mostly used in the harmonic mode with LO & IF diplexed together on the N connector, IF in the DC-several GHz (10 ?) range. If both ends open, you can use in fundamental mode mixing. NF ranged in the 15-20 dB area.

Should get you close.

BTW, if you decide to get rid of the ADTEC device, let me know, would like it for the collection.

Regards,

Jeff Kruth

In a message dated 4/7/2020 10:07:18 AM Eastern Standard Time, Brucekareen@... writes:

Tim,

Demornai-Bonardi 633 devices were directional couplers that coupled to a crystal detector on one coupled side and a flange on the other.? They were generally used with a reflecting cavity wavemeter on the flanged port to measure frequency.? The W version would have covered 90 to 140 GHz (WR-8).? These are fairly early designs and yours is probably at least fifty years old.? I am not familiar with the other device.

Bruce, KG6OJI