Abstract
A simple experimental system is described which permits simultaneous monitoring of all the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W</tex> -band and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">U</tex> -band spectral components generated by a W-band GaAs transferred electron (Gunn) oscillator. By examining the voltage and mechanical tuning behavior of several such oscillators their harmonic operating mode has been confirmed. Discussion of a theoretical treatment of the fundamental and harmonic mode is presented to highlight the likely pitfalls in the interpretation of the tuning behaviour seen from a crossguide oscillator test circuit. This combination of practical and theoretical results is used to show that the recently published claim for nonharmonic operation of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W</tex> -band GaAs TEO's is not yet proven.
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