Modulation transformer

This article has multiple issues. Please help improve it or discuss these issues on the talk page . (Learn how and when to remove these messages)

icon

This article needs more citations . Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources:"Modulation transformer"–news · newspapers · books · scholar · JSTOR (August 2026) (Learn how and when to remove this message)

The topic of this article may not meet Wikipedia's general notability guideline . Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted.
Find sources:"Modulation transformer"–news · newspapers · books · scholar · JSTOR (July 2026) (Learn how and when to remove this message)

(Learn how and when to remove this message)

A modulation transformer is an audio-frequency transformer that forms a major part of most AM transmitters. The primary winding of a modulation transformer is fed by an audio amplifier that has about 1/2 of the rated input power of the transmitter's final amplifier stage. The secondary winding is in series with the power supply of that final radio-frequency amplifier stage, thereby allowing the audio signal to lower and raise the instantaneous DC supply voltage of the power amplifier (PA) tube or transistor.^[1] Considering that the PA device is operated as a class-C amplifier, i.e. as a switch, the modulation transformer is responsible for the amplitude modulation (AM) of the transmitter. There Is only one system of modulation that can be used without the modulation transformer with high power. "This is loop modulation"