| SIEMENS E 309 |
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| General Coverage Communications Receiver |
| Single Conversion Superheterodyne |
| 15 Tubes + Semiconductors |
| Made in West Germany 1955 - 1965? |
| Specifications | |
| Coverage: | 250
- 530 kHz / 1.5 - 3.2 / 3.1 - 6.4 / 6.1 - 10.3 / 9.9 - 15.3 / 14.8
- 20.3 /
19.8 - 25.3 / 24.9 - 30.3 MHz |
| Modes: | AM/CW/MCW |
| Antenna Input: | HF 4/13 50-75 Ohms unbalanced |
| Sensitivity: | CW
(0.5 kHz): 0.2 µV 6 dB S/N
AM (8.0 kHz): 1.8 µV 10 dB S/N |
| Setting & Read out: | 1 kHz, if 100 kHz marks at dial are adjusted, without adjustment 5 kHz |
| Selectivity: | variable
0.5-8 kHz 6 dB
formfactor -6/-60 dB: 1:3.4 at 8 kHz |
| IF: | 1326 kHz |
| IF Rejection: | 60-90 dB |
| Image Rejection: | >60 dB |
| Audio Output: | 2 W/5000 Ohms, 600 Ohms line |
| Voltages: | 110/125/220 VAC +/-10% 40-60 Hz, 75 W |
| Physical: | Cabinet
Version: 550x355x407 mm, 38kg
Rack Version: 520x304x390 mm |
| Accessories: | FSE 2 for FSK, FSE 7 for Fax, FSE 1300 for diversity and duplex FSK or for FSK/AM, K 101 for SSB |
| Features | |||
| - Headphone Jack (2) | - Speaker | - Speaker Switch | - Line Out 600 Ohms |
| - IF Output Jack | - BFO +/-3 kHz | - ANL | - RF/AF Meter |
| - AGC/MGC | - AGC 0.2/2 sec. | - Diversity Mode | - RF Gain |
| - Calibrator 100 kHz | - Dial Lamps | - Dial Lock | - Flywheel Tuning |
| - Fine Tuning | - Three Fixed Positions | - Tube Checker | - Rack Handles |
| Circuit Complement | |
| Tubes + Semiconductors: | 7x
EF 93 (=6 BA 6), 1x EK 90 (=6 BE 6), 3x ECC 81 (=12 AT 7), 2x EB 91
(=6 AL 5), 1x EL 90 (=6 AQ 5), 1x 108 C 1 (=0B 2), most tubes can be checked by RF/AF meter, selenium rectifiers in power supply |
| Tuning: | Coil turret, four ganged capacitors in RF circuits, main tuning by a flywheel knob geared 60:1. For a setting accuracy of 1 kHz the knob is pushed when the pointer is exactly at the 20 kHz dial mark below the desired frequency. Then the meter can be aligned to the next 20 kHz mark above by a Wheatstone bridge. Iindividually calibrated dial; 4 circuits for HF, 9 circuits for IF |
| Crystals: | 1x
100 kHz for calibration, 3x in additional oscillator for fixed channels,
2x 1326 kHz in IF filter banks |
| Dials: | Coarse dial with calibrated 20 kHz marks, fine tuning resolution 1 kHz with meter |
| Comments |
| Descendent from Siemens E 303 - E 306, which had a big dial instead of frequency lens. Widely used by West German official authorities and military in 50's to 60's this receiver appeared later plentiful on the surplus market. Performance at SSB reception in CW mode is fair as the BFO gives a strong signal to the detection diode. Bandwidth variable for an optimal shape. Competitor was Telefunken E 127 Kw. |
| Variants |
| Front panel and cabinet in light gray or dark green. E 309b features a C-type antenna jack. |
| Additional Information |
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Block Diagram of the E 309 (Click to Enlarge)
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Rear View of the E 309b
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Detail of the Front Panel: the Calibrated Coarse Dial
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Another Detail: Meter as a Fine Tuning Dial
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The Following Photo Shows the E 309 in Use on Board of Ocean Going Tug "Pacific" (Callsign DNCH)
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Ocean Going Tugs "Pacific" and "Atlantic"
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The Following Photo Shows the E 309b as a Component of an Army's Telex Radio Station inside a Mercedes "Unimog"
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Late 1950s Mobile Radio Stations of West German Federal Police (Left) and "Bundeswehr" (Right)
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