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en:se-406 [2019/12/31 17:23]
mb
en:se-406 [2019/12/31 17:25] (aktuell)
mb [Technical principle]
Zeile 57: Zeile 57:
 {{ :​images:​se-406-sender-block.jpg?​direct&​400|SE-406 transmitter block diagram}} In the **keying and modulator rack**, the keying circuit (V53-V55) is used to supply the necessary voltages to to drive the driver and separation stage in the transmitter. The transmit / receive relay R1 is activated and the automatic switching from receiver to transmitter antennas in the antenna switching unit is triggered. {{ :​images:​se-406-sender-block.jpg?​direct&​400|SE-406 transmitter block diagram}} In the **keying and modulator rack**, the keying circuit (V53-V55) is used to supply the necessary voltages to to drive the driver and separation stage in the transmitter. The transmit / receive relay R1 is activated and the automatic switching from receiver to transmitter antennas in the antenna switching unit is triggered.
  
-In **telephony mode**, the microphone voltage is amplified in the microphone amplifier tube V56 ([[6SJ7]]) and is fed to the audio amplifier tube V57a ([[6SN7]], one system), when the microphone button is pressed. Teletype traffic is automatically interrupted via R5 and the grid bias voltage of the transmitter stage ist set to the value for AM operation. \\+In **telephony mode**, the microphone voltage is amplified in the microphone amplifier tube V56 ([[de:6SJ7]]) and is fed to the audio amplifier tube V57a ([[de:6SN7]], one system), when the microphone button is pressed. Teletype traffic is automatically interrupted via R5 and the grid bias voltage of the transmitter stage ist set to the value for AM operation. \\
 In CW mode ([[A1]]), the keying relay R6 is addressed directly, with "​Telegraphy modulated"​ ([[A2]]), a tone oscillator using valve V52a ([[de:​6SL7]],​ one system) is activated and the oscillator signal is fed to the audio amplifier V51b ([[de:​6SN7]]) and the phase inversion / amplifier stage V57b to drive the modulation amplifier. In CW mode ([[A1]]), the keying relay R6 is addressed directly, with "​Telegraphy modulated"​ ([[A2]]), a tone oscillator using valve V52a ([[de:​6SL7]],​ one system) is activated and the oscillator signal is fed to the audio amplifier V51b ([[de:​6SN7]]) and the phase inversion / amplifier stage V57b to drive the modulation amplifier.
 For teletype operation, the AF signal of the [[ETK]] or the keying tone from the remote control is also fed to the keying amplifier (V52b, V51a). For teletype operation, the AF signal of the [[ETK]] or the keying tone from the remote control is also fed to the keying amplifier (V52b, V51a).
en/se-406.txt · Zuletzt geändert: 2019/12/31 17:25 von mb