| Siemens E 311 |
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| Shortwave Communications Receiver |
| Triple Conversion Superheterodyne |
| 17 Tubes + Semiconductors |
| Made in West Germany 1960 - 70's |
| Specifications | |
| Coverage: | 1.5 - 3.5 / 3.4 - 7.6 / 7.5 - 15. 1 / 15.0 - 22.6 / 22.5 - 30.1 MHz |
| Modes: | AM/ECSS/USB/LSB/CW |
| Antenna Input: | SO-239 60 Ohm unbalanced |
| Sensitivity: | CW
(0.3 kHz filter): 0.16 µV 6 dB S/N,
AM (6 kHz filter): 1.5 µV 10 dB S/N, SSB (3.5 kHz filter): 0.7 µV 10dB S/N |
| Setting & Read out: | 100 Hz |
| Stability: | +/-20 Hz over 24 hours (after warm up of ovens) |
| Selectivity: | 6/3/1/0.3 kHz -6 dB, formfactor 6/60 dB 1:2.2 for AM and 1:1.3 for SSB |
| IF: | 1st IF: 1300-1400 kHz, 2nd IF: 370 kHz, 3rd IF: 30 kHz |
| IF Rejection: | >80 dB |
| Image Rejection: | >80 dB |
| Audio Output: | 1 W/5 Ohm, 600 Ohms line |
| Voltages: | 110/125/220/235 V AC +/-10% 40-60 Hz, average 70 W |
| Physical: | Cabinet Version: 471x291x391 mm, 25kg |
| Shock Mounting Frame: 498x328x420 mm | |
| Accessories: | E
350 long wave adapter 10-1500 kHz, FSE 30 or TG 440 (Teletron)
for FSK, H 305 for space diversity, Hellfax BS 110 or 114 for fax, NZ 3101 (Rohde&Schwarz) for ISB reception |
| Features | |||
| - 1/4'' Head Jack (2) | - Speaker | - Speaker Switch | - Line Out 600 Ohm |
| - BFO 1000 Hz | - ANL | - S/AF Meter | - AGC/MGC |
| - AGC 0.2/2 sec. | - Squelch | - IF Output Jack | - Ref. Osc. Oven |
| - Spectr. Osc. Oven | - RF Gain | - Calibrator 100 kHz | - Dial Lamps |
| - Dial Adjust | - Dial Lock | - Fine Tuning | - Spinner Knobs |
| - Preselector | - Semi-Modular | - Rack Handles | |
| Circuit Complement | |
| Tubes + Semiconductors: | 3x EF 93 (=6 BA 6), 5x ECH 81 (=6 AJ 8), 8x E 88 CC (=6922), 1x 85 A 2, germanium, selenium and silicon rectifiers, zener diodes for voltage regulation, 4x germanium transistors in power supply and 11x in 1 kHz spectrum oscillator, ovens for VFO and 100 kHz spectrum unit. |
| Tuning: | Four ganged capacitively tuned preselector circuits. Coarse tuning via 1st oscillator continuously or in steps of 100 kHz (phase locked to a spectrum oscillator in an oven). RF conversion to 1st IF (1300 to 1400 kHz), fine tuning between lock-in steps via 2nd oscillator (930 to 1030 kHz, in an oven) for further conversion to 2nd IF (370 kHz). The 2nd oscillator can be locked to an optional 1 kHz spectrum unit. 4 circuits for RF, 7 for 1st IF, 8 for 2nd IF and 8 for 3rd IF (SSB). |
| Crystals: | 1x 100 kHz for calibration and spectrum unit, 1x 340 kHz + 1x 400 kHz in 3rd oscillator (USB/LSB) for 3rd conversion to 3rd IF (30 kHz), 1x 30 kHz + 31 kHz in BFO (SSB/CW) for 4th conversion (product detector) to AF. |
| Dials: | Dial for coarse setting in 100 kHz steps. Fine tuning dial (between 0 and 100 kHz) of odometer type with 100 Hz readout . Both dials are driven by spinner knobs and gears. |
| Comments |
| This receiver was designed in 1959 for AM, CW, FSK and SSB reception. It was widely used by different government authorities and in military applications. It could be found on board of most German ships in the Sixties and Seventies. As a tube receiver the E 311 has an incredible setting accuracy of 100 Hz and an impressive stability of 20 Hz over 24 hours. The tuning scale has an effective length of 285 m (935 feet). Excellent for AM reception in an ECSS mode as well. The E 311 is probably one of the best tube receivers for FSK and SSB ever built. |
| Variants |
| Versions E 311a to E 311e are very similar. Only small changes mostly in power supply, audio stages and 100 kHz spectrum unit were made. The E 311e1 and E 311e2 are the cabinet versions; the E 311e3 and E 311e4 have a shock mounting frame. E 311e2 and E 311e4 include the optional 1 kHz spectrum unit. |
| Additional Information |
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Block diagram of the E 311 (click to enlarge).
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Top view of the SIEMENS E 311: note the modular construction  |
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Accessory: Long wave adapter E 350
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E 311 in use on board of Ocean Liner "Bohéme" (callsign DLCT)
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Ocean Liner "Bohéme"
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