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en:se-400

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en:se-400 [2019/11/19 21:47]
mb
en:se-400 [2019/11/19 21:51] (aktuell)
mb
Zeile 50: Zeile 50:
 At the right below the instrument, which can be set to tune and display the antenna current, the main switch and the switch for transceive - onboard intercom operation are located. At the right below the instrument, which can be set to tune and display the antenna current, the main switch and the switch for transceive - onboard intercom operation are located.
  
-The transmitter is equipped with seven valves [[1619]] and one [[1624]] as a output valve. Some spare tubes are housed inside the cabinet.+The transmitter is equipped with seven valves [[de:1619]] and one [[de:1624]] as a output valve. Some spare tubes are housed inside the cabinet.
  
 ===== Technical Principle ===== ===== Technical Principle =====
-{{ :​images:​se-400-bc-683-a-block.jpg?​direct&​600|Blockschema SE-400 Empfänger}}\\ +{{ :​images:​se-400-bc-683-a-block.jpg?​direct&​600|Blockschema SE-400 Empfänger}}\\  
-**Receiver BC-683-A**: The RF signal from the antenna is amplified (V1, [[6AC7]]) and mixed with the signal of the RF oscillator (V3, [[6J5]]) in the mixer stage (V2, [[ 6AC7]]) to generate the intermediate frequency of 2.65 MHz. The IF is amplified in two IF amplifier stages (V4 and V5, two [[12SG7]]) and has to pass a limiter stage (V6, [[6AC7]]). The demodulation is done in the discriminator stage (V7, [[6H6]]), the AF signal is amplified in the AF preamp valve (V10, [[6SL7GT]]),​ which also acts as IF oscillator) and the AF output stage (V8, [[6V6GT]]). Tube V9 ([[6SL7GT]]) acts as AVC and squelch.+**Receiver BC-683-A**: The RF signal from the antenna is amplified (V1, [[de:6AC7]]) and mixed with the signal of the RF oscillator (V3, [[de:6J5]]) in the mixer stage (V2, [[de:6AC7]]) to generate the intermediate frequency of 2.65 MHz. The IF is amplified in two IF amplifier stages (V4 and V5, two [[de:12SG7]]) and has to pass a limiter stage (V6, [[de:6AC7]]). The demodulation is done in the discriminator stage (V7, [[de:6H6]]), the AF signal is amplified in the AF preamp valve (V10, [[de:6SL7GT]]), which also acts as IF oscillator) and the AF output stage (V8, [[de:6V6GT]]). Tube V9 ([[de:6SL7GT]]) acts as AVC and squelch.
  
-{{ :​images:​se-400-bc-684-a-block.jpg?​direct&​700|Blockschema SE-400 Sender}}\\ +{{ :​images:​se-400-bc-684-a-block.jpg?​direct&​700|Blockschema SE-400 Sender}}\\  
-**Transmitter BC-684-A**: With the pushbutton unit, the corresponding transmitter crystal (operation frequency is 72 times the crystal frequency) is connected to the transmitting oscillator (V107, [[1619]]). After an RF amplifier stage (V101, [[1619]]), the RF signal is amplified along with the audio signal, coming from the microphone and amplified in two AF amplifier stages (V105, V106, two [[1619]]), and then fed to the modulator coil. The signal rich of harmonics is rectified (V102, [[1619]]) and its twelfth harmonic is filtered out. After a frequency tripler stage (V108, [[1619]]) followed by a frequency doubler stage (V103, [[1619]]), the transmitter output stage tube (V104, [[1624]]) is driven. The operations frequency corresponds to 72 times the transmitter crystal frequency and the output power reaches 20 watts. The signal is fed to the antenna output socket over one of ten pretuned antenna circuits selected by the pushbutton unit.+**Transmitter BC-684-A**: With the pushbutton unit, the corresponding transmitter crystal (operation frequency is 72 times the crystal frequency) is connected to the transmitting oscillator (V107, [[de:1619]]). After an RF amplifier stage (V101, [[de:1619]]), the RF signal is amplified along with the audio signal, coming from the microphone and amplified in two AF amplifier stages (V105, V106, two [[de:1619]]), and then fed to the modulator coil. The signal rich of harmonics is rectified (V102, [[de:1619]]) and its twelfth harmonic is filtered out. After a frequency tripler stage (V108, [[de:1619]]) followed by a frequency doubler stage (V103, [[de:1619]]), the transmitter output stage tube (V104, [[de:1624]]) is driven. The operations frequency corresponds to 72 times the transmitter crystal frequency and the output power reaches 20 watts. The signal is fed to the antenna output socket over one of ten pretuned antenna circuits selected by the pushbutton unit.
  
 ==== Tube Layout ==== ==== Tube Layout ====
-**Receiver BC-683-A**: V1 ([[6AC7]], RF amplifier); V2 ([[6AC7]], (mixer); V3 ([[6J5]], RF oscillator);​ V4 and V5 ([[12SG7]], first and second IF amplifiers);​ V6 ([[6AC7]], limiter); V7 ([[6H6]], discriminator);​ V8 ([[6V6GT]], AF final stage); V9 ([[6SL7GT]],​ AVC, Squelch); V10 ([[6SL7GT]],​ AF pre amplifier and IF oscillator);​ Dynamotor DM-34.+**Receiver BC-683-A**: V1 ([[de:6AC7]], RF amplifier); V2 ([[de:6AC7]], (mixer); V3 ([[de:6J5]], RF oscillator);​ V4 and V5 ([[de:12SG7]], first and second IF amplifiers);​ V6 ([[de:6AC7]], limiter); V7 ([[de:6H6]], discriminator);​ V8 ([[de:6V6GT]], AF final stage); V9 ([[de:6SL7GT]], AVC, Squelch); V10 ([[de:6SL7GT]], AF pre amplifier and IF oscillator);​ Dynamotor DM-34.
  
-**Transmitter BC-684-A**: V101 ([[1619]], 1st RF amplifier stage); V102 ([[1619]], rectifier); V103 ([[1619]], frequency doubler stage); V104 ([[1624]], transmitter final amplifier); V105 ([[1619]], 1st AF amplifier stage); V106 ([[1619]], 2nd AF amplifier stage); V107 ([[1619]], transmitter oscillator);​ V108 ([[1619]], frequency tripler stage); Dynamotor DM-35.+**Transmitter BC-684-A**: V101 ([[de:1619]], 1st RF amplifier stage); V102 ([[de:1619]], rectifier); V103 ([[de:1619]], frequency doubler stage); V104 ([[de:1624]], transmitter final amplifier); V105 ([[de:1619]], 1st AF amplifier stage); V106 ([[de:1619]], 2nd AF amplifier stage); V107 ([[de:1619]], transmitter oscillator);​ V108 ([[de:1619]], frequency tripler stage); Dynamotor DM-35.
  
 ==== Development ==== ==== Development ====
en/se-400.txt · Zuletzt geändert: 2019/11/19 21:51 von mb