en:e-638
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— | en:e-638 [2019/04/07 17:45] (aktuell) – angelegt - Externe Bearbeitung 127.0.0.1 | ||
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+ | ====== E-638: Telefunken E 108 Lw/4 ====== | ||
+ | **E-638**, **Telefunken E 108 Lw/4**; developed and produced by [[Telefunken D|Telefunken, | ||
+ | The Telefunken E 108 Lw/4 is a very heavy and bulky VLF / mediumwave receiver mainly used for maritime and point-to-point communications constructed in the fifties - a few samples seem to have served with the Swiss Army. | ||
+ | |||
+ | {{: | ||
+ | ===== Technical Data ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Modes]]: [[A1|CW (A1)]], [[A3J|SSB (A3J]] with BFO, [[A3|AM (A3)]] | ||
+ | * [[Frequency range]]: 10 - 1800 kHz | ||
+ | * **Analog dial**, dial accuracy 2 kHz | ||
+ | * [[Sensitivity]]: | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Mains]]: 110 - 240 V AC | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * 555 x 480 x 590 mm, 75 kg | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | * SSB/ISB adaptor **BP102** | ||
+ | * radio teletype converter TgFs127 | ||
+ | |||
+ | ---- | ||
+ | {{: | ||
+ | ===== Operation ===== | ||
+ | The VLF - mediumwave receiver E 108 covers 10 - 1800 kHz in six ranges and has a very similar design to the [[E-639|Telefunken E104]] shortwave receiver. | ||
+ | |||
+ | The receiver is extremely bulky and heavy, it's 555 x 480 x 590 mm wide and in it's desktop cabinet, the receiver has a weight of 75 kg - this will be the reason, many of the receivers have been cleared out.\\ | ||
+ | The receiver can be powered from different AC voltages from 110 to 240 V. | ||
+ | |||
+ | The top third of the frontpanel is taken by the linear dial.\\ | ||
+ | In the left lower quadrant of the front panel, you find rotary controls in three rows: the BFO pitch control with it's +/- 3 kHz range, the crystal calibrator switch and the reception mode selector combined with the mains switch. In the middle row, you find the control to adjust the level of the line out output and the AGC time selector and in the bottom row the bandwidth selector and the controls for audio and radio frequency (RF Gain) gain. | ||
+ | |||
+ | In the right lower quadrant of the receiver' | ||
+ | |||
+ | The receiver acts as a double conversion receiver with a first I.F. of 80 kHz in the ranges 1, 4 and 5 and 320 kHz in the ranges 2, 3 and 6, the second intermediate frequency is 525 kHz, the same as found in the E104 shortwave receiver. | ||
+ | |||
+ | After having passed the I.F. filter bank, the signal is fed to the AM detector, a BFO can be used to receive CW and single sideband signals. | ||
+ | |||
+ | There has been an optional FSK demodulator Fs Tg 127 for the reception of radioteletype signals and a BP 102 single sideband demodulator to match the E 108. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | {{: | ||
+ | After two RF preamplifier stages (two [[de: | ||
+ | |||
+ | ==== Valve setup ==== | ||
+ | V1 ([[de: | ||
+ | Gl (mains rectifier), stabilizer [[de: | ||
+ | |||
+ | ==== Development ==== | ||
+ | |||
+ | ==== Field use ==== | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ==== Manuals ==== | ||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | ==== Additional information ==== | ||
+ | * [[http:// | ||
+ | * [[https:// |
en/e-638.txt · Zuletzt geändert: 2019/04/07 17:45 von 127.0.0.1