Accession Number:

AD0716529

Title:

Some Questions in the Theory of Auto Collector Modulation (AKM) and Amplitude-Frequency Distortion in AKM,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1970-10-29

Pagination or Media Count:

22.0

Abstract:

In his previous works, Yu. I. Sudakov has shown the possibility of the base or collector amplitude modulation in externally excited transistorized oscillators connected in a common emitter configuration. Base modulation requires a low power modulator which provides low efficiency 35-40 percent, while collector modulation with 70-80 percent efficiency requires a more powerful modulator. The disadvantages of both modulation types are manifested sharply if they are designed for the output stages of transistorized transmitters. The author has proven that collector self-modulation CSM in the output stage with a common emitter combines the positive properties of base and collector types of modulation. The present article is devoted to an analysis of an equivalent circuit of a stage with the low-frequency CSM. One of the most simple CSMs is a circuit in which the self-bias has been introduced. To verify the fundamental theoretical conclusions reached in the analysis presented, an experimental test circuit was designed. Measurements of CMS frequency-amplitude distortions in the transmitter output stage were carried out at a frequency of 3mHz. The modulation frequency was varied from 100 to 10,000 to 128,000 Hz. The induction of the inductor was changed with the aid of a switch. Author

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE