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The concept of a frequency converter is used in at least two applications: broadcast ^[1] and test and measurement. ^[2] According to the first sentence of the lead, this article is supposed to be about broadcast applications so I have reverted the recent improvement referring to the test and measurement application.

Unfortunately, I am unable to immediately find any sources related to the broadcast application. — Preceding unsigned comment added by Kvng ( talk • contribs) 13:37, 23 April 2024 (UTC) reply

Cielquiparle has added The Audio Dictionary ^[1] as a source for broadcast applications. A copy is available at the Internet Archive and I have verified. Thank you! ~ Kvng ( talk) 14:24, 9 May 2024 (UTC) reply