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en:se-222 [2019/11/02 20:07]
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en:se-222 [2019/11/02 20:16] (aktuell)
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 ===== Technical Principle ===== ===== Technical Principle =====
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-In the **transmitter** the audio signal is fed to a push-pull modulator and mixed with the signal of a 250 kHz oscillator (Osz.13, V202, one system of [[12AU7]]), after a carrier suppressor, the signal has to pass an upper sideband mechanical filter. The valves V304 and V305 are used to switch the mechanical 250 kHz filter from reception to transmission mode and the V306 ([[5654]]) divides the signal feed to receiver and transmitter after the mechanical filter. In the second modulator stage, the signal of 251 kHz is mixed with the signal of the variable oscillator (Osz.14, V301, V302, two [[5654]], 548,5 - 648,5 KHz, used to tune within the 100 kHz range) generate the second transmitter IF, which is variable in the 800 - 900 kHz range. This IF is fed to an amplifier (V303, [[5654]]) and in the thirdmodulator stage, the signal crystal oscillator (Osz. 15, V601, [[5654]]) which can be tuned from 2,6 - 4,3 MHz in 100 kHz steps, to generate the transmitter operation frequency. After two RF preamplifier stages (V101 and V401, two [[5654]]) the signal is feed to the transmitter driver (V402, V403, two [[12AU7]] in push-pull arrangement) and the the final RF amplifier. It consists of two sets of two final amplifier push-pull valves in parallel (V404, V405, V406, V407, four [[6146]]). An automatic gain control protects the output stage if the antenna coupling is poor by feeding a negative grid voltage to the preamplifier V303 / V305.\\ ​+In the **transmitter** the audio signal is fed to a push-pull modulator and mixed with the signal of a 250 kHz oscillator (Osz.13, V202, one system of [[de:12AU7]]), after a carrier suppressor, the signal has to pass an upper sideband mechanical filter. The valves V304 and V305 are used to switch the mechanical 250 kHz filter from reception to transmission mode and the V306 ([[de:5654]]) divides the signal feed to receiver and transmitter after the mechanical filter. In the second modulator stage, the signal of 251 kHz is mixed with the signal of the variable oscillator (Osz.14, V301, V302, two [[de:5654]], 548,5 - 648,5 KHz, used to tune within the 100 kHz range) generate the second transmitter IF, which is variable in the 800 - 900 kHz range. This IF is fed to an amplifier (V303, [[de:5654]]) and in the thirdmodulator stage, the signal crystal oscillator (Osz. 15, V601, [[de:5654]]) which can be tuned from 2,6 - 4,3 MHz in 100 kHz steps, to generate the transmitter operation frequency. After two RF preamplifier stages (V101 and V401, two [[de:5654]]) the signal is feed to the transmitter driver (V402, V403, two [[de:12AU7]] in push-pull arrangement) and the the final RF amplifier. It consists of two sets of two final amplifier push-pull valves in parallel (V404, V405, V406, V407, four [[de:6146]]). An automatic gain control protects the output stage if the antenna coupling is poor by feeding a negative grid voltage to the preamplifier V303 / V305.\\ ​
 V203 is used to monitor the AF from the first transmitter modulator stage. V203 is used to monitor the AF from the first transmitter modulator stage.
  
-Modulation is different according to the operation mode: in A1 mode, the signal of the morse key acts on the keying valve (V205, [[5654]]) and a  1,5 kHz oscillator (V206) to be fed to the first transmitter modulator. In A3J telephony, the microphone signal directly and for remote operation over an additional amplifier stage (V108) to the modulator. In FSK mode, the impulses of the [[ETK]](Eintonkombinations) teletypewriter is amplified (V108) and fed to the keying valve V205. Two AF oscillators of 1,5 / 1,8 kHz (V206, V207, two[[5654]]) generate the audio signal of 1,8 kHz for space and 1,5 kHz as mark during the impuls of the [[ETK]], even these signals are fed to the first transmitter modulator in a similar manner.+Modulation is different according to the operation mode: in A1 mode, the signal of the morse key acts on the keying valve (V205, [[de:5654]]) and a  1,5 kHz oscillator (V206) to be fed to the first transmitter modulator. In A3J telephony, the microphone signal directly and for remote operation over an additional amplifier stage (V108) to the modulator. In FSK mode, the impulses of the [[ETK]](Eintonkombinations) teletypewriter is amplified (V108) and fed to the keying valve V205. Two AF oscillators of 1,5 / 1,8 kHz (V206, V207, two[[de:5654]]) generate the audio signal of 1,8 kHz for space and 1,5 kHz as mark during the impuls of the [[ETK]], even these signals are fed to the first transmitter modulator in a similar manner.
  
-In the **Receiver**,​ the signals of the same oscillators (Osz.15, 100 KHz ranges and Osz.14, tuning within a 100 kHz range) are used to generate an oscillator frequency from 1,9515 up to 3,7515 MHz: The signal coming from the antenna hass to pass a band filter and an attenuator and is fed to the first RF amplifier (V105, [[5654]])and a second RF amplifier stage (V106, [[5654]]).+In the **Receiver**,​ the signals of the same oscillators (Osz.15, 100 KHz ranges and Osz.14, tuning within a 100 kHz range) are used to generate an oscillator frequency from 1,9515 up to 3,7515 MHz: The signal coming from the antenna hass to pass a band filter and an attenuator and is fed to the first RF amplifier (V105, [[de:5654]]) and a second RF amplifier stage (V106, [[de:5654]]).
  
-The signal from the crystal oscillator Osz.15 with its 100 kHz steps is mixed with the signal of the VFO oscillating between 548,5 - 648,5 kHz (Osz.14). So the oscillator frequency variable between 1,9515 and 3,7515 is amplified ([[5654]]) and in th first mixer stage (1. Empf.-Modulator) the first intermediate frequency of 251,5 kHz is generated.+The signal from the crystal oscillator Osz.15 with its 100 kHz steps is mixed with the signal of the VFO oscillating between 548,5 - 648,5 kHz (Osz.14). So the oscillator frequency variable between 1,9515 and 3,7515 is amplified ([[de:5654]]) and in th first mixer stage (1. Empf.-Modulator) the first intermediate frequency of 251,5 kHz is generated.
  
-In reception mode, valve V304 ([[5654]]) is feeding the signal to the mechanical 250 kHz filter and this will come back to the reception path. In an amplifier stage (V209, [[5654]]), the AGC (automat. gain control) voltage is generated. The signal is mixed with the 250 kHz oscillator signal (2. Empfangsmodulator,​ V210, second system [[12AU7]]) to generate the audio signal.+In reception mode, valve V304 ([[de:5654]]) is feeding the signal to the mechanical 250 kHz filter and this will come back to the reception path. In an amplifier stage (V209, [[de:5654]]), the AGC (automat. gain control) voltage is generated. The signal is mixed with the 250 kHz oscillator signal (2. Empfangsmodulator,​ V210, second system [[de:12AU7]]) to generate the audio signal.
  
-The audio signal is amplified in the AF preamplifier (V203, [[5654]]), the AF ecxiter stage (V202, one system of the [[12AU7]]) and the AF final amplifier (V204, [[12AU7]], two triodes in push-pull arrangement),​ AGC acts on all three AF stages. For F1 reception, the signal is amplified in three limiter stages (V102, V103, V104, three [[5654]])and fed to the discriminator (made from four semiconductor diodes), after a 80 Hz filter the signal can drive the [[ETK]] teletypewriter.+The audio signal is amplified in the AF preamplifier (V203, [[de:5654]]), the AF ecxiter stage (V202, one system of the [[de:12AU7]]) and the AF final amplifier (V204, [[de:12AU7]], two triodes in push-pull arrangement),​ AGC acts on all three AF stages. For F1 reception, the signal is amplified in three limiter stages (V102, V103, V104, three [[de:5654]])and fed to the discriminator (made from four semiconductor diodes), after a 80 Hz filter the signal can drive the [[ETK]] teletypewriter.
  
-The remote control amplifier (V108, [[5654]]) is used for remote operation.+The remote control amplifier (V108, [[de:5654]]) is used for remote operation.
  
 ==== Valve layout ==== ==== Valve layout ====
-V101 ([[5654]], 1. transmitter RF amplifier); V102, V103, V104 (three [[5654]], F1 limiter); V105 ([[5654]], 1. RF receiver amplifier); V106 ([[5654]], 2nd receiver amplifier); V108 (remote operation amplifier) +V101 ([[de:5654]], 1. transmitter RF amplifier); V102, V103, V104 (three [[de:5654]], F1 limiter); V105 ([[de:5654]], 1. RF receiver amplifier); V106 ([[de:5654]], 2nd receiver amplifier); V108 (remote operation amplifier) 
-V202 ([[12AU7]], one system Osc.13 - 250 kHz; one system AF driver); V203 [[5654]], AF preamplifier);​ V204 ([[12AU7]], AF output valve, zwei triode systems in push-pull operation); V205 ([[5654]], keying valve); V206, V207 (two[[5654]],​ AF oscillator 1,5 / 1,8 kHz); V209 ([[5654]], AGC amplifier); V210 (2nd system [[12AU7]], 2. receiver mixer stage)+V202 ([[de:12AU7]], one system Osc.13 - 250 kHz; one system AF driver); V203 [[de:5654]], AF preamplifier);​ V204 ([[de:12AU7]], AF output valve, zwei triode systems in push-pull operation); V205 ([[de:5654]], keying valve); V206, V207 (two[[de:5654]], AF oscillator 1,5 / 1,8 kHz); V209 ([[de:5654]], AGC amplifier); V210 (2nd system [[de:12AU7]], 2. receiver mixer stage)
  
-V301, V302 (two [[5654]], Osz. 14 - 548,5 - 648,5 KHz); V303 ([[5654]], transmitter IF amplifier 800-900 kHz); V304, V305 (two [[5654]], transmit receive switch of the 250 kHz filter); V306 ([[5654]], transmit receive switching after mechanical filter) +V301, V302 (two [[de:5654]], Osz. 14 - 548,5 - 648,5 KHz); V303 ([[de:5654]], transmitter IF amplifier 800-900 kHz); V304, V305 (two [[de:5654]], transmit receive switch of the 250 kHz filter); V306 ([[de:5654]], transmit receive switching after mechanical filter) 
-V401 ([[5654]], 2. tranmitter ​RF amplifier); V402, V403 (two [[12AU7]], transmitter driver, push-pull arrangement);​ V404, V405, V406, V407 (four [[6146]], two parallel sets of two RF output valves in push-pull arrangement) +V401 ([[de:5654]], 2. transmitter ​RF amplifier); V402, V403 (two [[de:12AU7]], transmitter driver, push-pull arrangement);​ V404, V405, V406, V407 (four [[de:6146]], two parallel sets of two RF output valves in push-pull arrangement) 
-V601 ([[5654]], oscillator 15, 2,6-4,3 MHz)+V601 ([[de:5654]], oscillator 15, 2,6-4,3 MHz)
  
 ==== Development ==== ==== Development ====
 In the early fifties, [[Telefunken]] was working on a successor for the [[TL]]-station,​ the [[SE-220]], only a small series of this type has been produced for troop trials. At the same time, [[Zellweger]] presented a singe sideband station which turned out to be much more powerful and even cheaper then the Telefunken set, is was introduced as SE-222. In the early fifties, [[Telefunken]] was working on a successor for the [[TL]]-station,​ the [[SE-220]], only a small series of this type has been produced for troop trials. At the same time, [[Zellweger]] presented a singe sideband station which turned out to be much more powerful and even cheaper then the Telefunken set, is was introduced as SE-222.
  
-The set is of modular construction,​ some subgroups are mounted in metal cans which look like shielding cans, and they can be blugges ​in on valve like sockets to make repair works easier.+The set is of modular construction,​ some subgroups are mounted in metal cans which look like shielding cans, and they can be plugged ​in on valve like sockets to make repair works easier.
  
 Even the prototypes of the new station capable of CW, single sideband and [[FSK]] operation were welcomed with much enthousiasm when they were introduced in 1954. In contrast to the expectations,​ single sideband telephony was used rarely, because [[Gretag]] had finished development of their [[ETK]], [[TC53]] and [[KFF]] machines which gave the possibility of automatic encrypted radioteletype operation. Even the prototypes of the new station capable of CW, single sideband and [[FSK]] operation were welcomed with much enthousiasm when they were introduced in 1954. In contrast to the expectations,​ single sideband telephony was used rarely, because [[Gretag]] had finished development of their [[ETK]], [[TC53]] and [[KFF]] machines which gave the possibility of automatic encrypted radioteletype operation.
en/se-222.txt · Zuletzt geändert: 2019/11/02 20:16 von mb