Microwave Lab Trainers Lab Equipment Manufacturer, Supplier and Exporter in India

Microwave Lab Trainers: Klystron, Gunn and Full Bench

Component or bench?

This is the decision this listing exists for, and getting it wrong is expensive in both directions.

Buy a component - a source on its own - when you already own a working bench in that waveguide band and you are either replacing a failed source or adding a second type of source to the experiments you can run. In that case the only thing that matters is that it fits: same waveguide band, same flange standard. Send us the band and the flange details of what you own, or a measurement across an existing flange, and we will confirm compatibility in writing before quoting. A source that will not bolt to your guide is scrap.

Buy a complete bench when you are starting from nothing. A source alone measures nothing: without a slotted line, a frequency meter, an attenuator, a detector mount, a matched load and a standing wave ratio meter there is no experiment, only a device that radiates. Laboratories that buy a source first and the rest later usually spend more and wait longer than those that specify the bench once.

The full bench record in this listing (dielectric and E-plane) is the middle case: a bench already configured for two specific experiment groups. If those are the experiments your syllabus names, it is the efficient purchase; if your list is longer, tell us the list and we will quote against it rather than against a configuration.

What "Gunn diode" has to mean before you can order it

We would rather raise this than let a purchase order go wrong. The term covers at least three levels of supply:

• The bare semiconductor device. Useful only to someone replacing a diode in an existing mount, and useless to anyone else.
• The diode in its waveguide mount, with the cavity and tuning arrangement. Still needs a supply and a modulator.
• A complete Gunn oscillator assembly: mounted diode, regulated low-voltage supply, and a PIN modulator to square-wave modulate the output - which, as our microwave test bench page explains, is what a standing wave ratio meter needs in order to read anything at all.

So the question on the enquiry is: is the supply included, is a modulator included, and what waveguide mount is it in? A Gunn source bought without a modulator will light up and measure nothing, and the laboratory will spend a week deciding the meter is broken.

The klystron question nobody asks until it is too late

A reflex klystron is a vacuum tube, and like any vacuum tube it has a finite life and will eventually need replacing. So the question to ask before buying a klystron bench is whether the tube can still be bought, and at what price.

This matters more than it used to. Klystron production has contracted as solid-state sources have replaced them in industry, while teaching syllabuses still name the klystron mode characteristic experiment. The result is a legitimate purchase with a supply-chain tail, and it should be entered into with the facts: a bench whose tube cannot be replaced has the working life of its tube.

Our advice, which argues against the larger sale: ask us in writing about replacement tube availability and price before ordering, and consider buying a spare tube with the bench if the experiment is central to your course. If klystron mode characteristics are not named in your syllabus, a Gunn source does every other experiment on the bench, from a low-voltage supply, with no tube to replace and considerably less electrical hazard in a student laboratory.

And where a klystron bench is bought, treat its power supply as the laboratory's principal electrical hazard: several hundred volts on an open bench. Covers and interlocks in place, nothing unbolted with the supply energised, and one person responsible for switching.

What to tell us when you enquire

• Whether you are extending an existing bench or starting from nothing - and if extending, the waveguide band and flange standard you already have.
• For a source: whether you need the bare device, a mounted diode or a complete oscillator with supply and modulator.
• The experiments your syllabus names, including whether klystron mode characteristics are required.
• For a klystron: whether you want a spare tube, and confirmation of replacement availability and price.
• Supply voltage and frequency, destination country, and whether your institution has confirmed any spectrum authorisation requirement for the band.

Related ranges: microwave test benches for complete benches, antenna and satellite trainers for antenna and propagation measurement, radar trainers, communication and RF trainers, and EPROM programmers and programmer testers - which is where the universal programmer record currently sitting in this listing belongs. The full training kits and electronics lab trainer kits categories list the rest.

Frequently asked questions

Can I buy just a source to replace a failed one?

Yes, and that is one of the main reasons this listing exists. The only requirement is that it fits: the same waveguide band and the same flange standard as your existing guide. Send us the band and flange details, or a measurement across a flange you already own, and we will confirm compatibility in writing before quoting. Do not order on the assumption that microwave components are interchangeable - across bands they are not, and the flanges will usually not even bolt together.

Will a Gunn source work with my existing standing wave ratio meter?

Only if it is modulated. A standing wave ratio meter is a narrow-band amplifier tuned to a fixed audio frequency, so the microwave output must be square-wave modulated at that frequency - normally by a PIN modulator supplied with the source. Confirm that the modulator is included and that its frequency matches your meter. A source without a modulator is the commonest reason a bench appears to be dead.

How long does a klystron last, and can it be replaced?

It is a vacuum tube with a finite life, and the honest answer about replacement is that it depends on current availability, which has tightened as industry has moved to solid-state sources. Ask us in writing before ordering, consider a spare tube if the klystron experiment is central to your course, and bear in mind that a bench whose tube cannot be replaced has the working life of that tube. If your syllabus does not require klystron mode characteristics, a Gunn source avoids the question entirely.

Why is a universal programmer in a microwave category?

It should not be, and we have said so rather than writing copy around it. A forty-pin universal programmer is a device programming tool and belongs with our EPROM programmer and programmer tester range, which is linked above. It has been flagged to be moved. If that is what you were looking for, follow the link; if you reached this page looking for microwave equipment, ignore that record.

Is a Gunn bench good enough for a degree-level laboratory?

For every standard microwave measurement experiment except klystron mode characteristics, yes - standing wave ratio and impedance, guide wavelength and frequency, attenuation, power division, dielectric measurement and horn patterns are all done exactly the same way whichever source drives the guide. The klystron is required only where the syllabus names the tube itself as the object of study.

Why does the same product code appear in three of your categories?

Because product codes have been generated from category names without checking for codes already in use, and Microwave, Microprocessor and Mechanical Lab Trainers all reduce to the same initials. We have published it here and flagged it for correction. Until it is fixed, order by code and full product name together and we will confirm both on the quotation - that avoids the error completely.

Key takeaways

• Ask what is in the box. "Gunn diode" can mean a bare device, a mounted diode or a complete oscillator with supply and modulator - three different purchases.
• A source alone measures nothing. Starting from nothing, buy the bench; extending a bench, buy the component - and match band and flange.
• No modulator, no reading. A standing wave ratio meter needs the source square-wave modulated at its own fixed frequency.
• Ask about klystron tube availability and price before ordering, and consider a spare. A bench whose tube cannot be replaced has the life of its tube.
• If the syllabus does not name the klystron, a Gunn source does the rest - lower voltage, no tube, far less hazard.
• An MLT- code identifies three different products on this site. Always order by code and full name.

About this page

Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.

Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 17 October 2026.

This page is deliberately short because the category holds four records, and padding it to the length of our larger category pages would serve nobody. Notes published rather than hidden: the MLT- code collision across three categories is described above; one record in this listing carries the prefix letters transposed (MTL- instead of MLT-), so it will not sort or search with its siblings; one record is a forty-pin universal programmer, which is not microwave equipment and has been flagged to be moved; and this listing overlaps our microwave test benches listing, which we have also flagged. Replacement tube availability, waveguide bands, flange standards and all other specifications will be confirmed in writing on the quotation; verify them before tender submission. Spectrum authorisation requirements differ by country and must be confirmed with your national authority.