
der Sender
station
A radio or television broadcasting organization that broadcasts programs.
Welcher Sender überträgt heute Abend das Fußballspiel?
Which station is broadcasting the football game tonight?
station / sender
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station
A radio or television broadcasting organization that broadcasts programs.
Welcher Sender überträgt heute Abend das Fußballspiel?
Which station is broadcasting the football game tonight?

sender
A person or institution that sends a message, letter, or package.
Der Sender der E-Mail war mir unbekannt.
The sender of the email was unknown to me.

transmitter
A technical device that emits electromagnetic waves or signals.
Der kleine Sender im Halsband der Katze übermittelt ihre Position.
The small transmitter in the cat's collar transmits its position.
'Der Sender' is derived from the verb 'senden' (to send). The ending '-er' refers to a person or thing that performs the action. A 'Sender' is therefore someone or something that sends something.
Dieser Radiosender spielt nur klassische Musik.
This radio station only plays classical music.
You can recognize the meaning of 'Sender' from the context. If it is about media such as radio or television, it refers to a broadcasting organization. If it is about mail or emails, it refers to the person who sends something. If it is about technology, it refers to a device.
Schalte bitte auf einen anderen Sender um.
Please switch to another station.
In the context of media, 'Sender' (station) is often used with verbs such as 'wechseln' (to change), 'einschalten' (to turn on), or 'umschalten' (to switch over). People also speak of 'private' (private) or 'öffentlich-rechtliche' (public-service) broadcasters.
Auf welchem Sender kommt die Nachrichtensendung?
Which station is the news program on?
radio
Radio and Sender can both refer to the institution behind a radio program. Radio tends to mean the medium or the radio station as a whole, while Sender refers to a specific broadcasting organization that airs programs. Use Sender when you want to identify or compare one particular station precisely.

Der Sender strahlt die neue Nachrichtensendung jeden Abend um acht Uhr aus.
The station airs the new news program every evening at eight.
Das Radio informiert die Menschen jeden Morgen über wichtige Nachrichten.
Radio informs people about important news every morning.