| RFT Betriebsempfaenger 1340.21 |
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| General Coverage Communications Receiver |
| Double Conversion Superheterodyne |
| 22 Tubes + Semiconductors |
| Made in East Germany 1962 - 1970's |
| Specifications | |
| Coverage: | 14 kHz - 30.1 MHz in 12 ranges |
| Modes: | AM/CW/MCW |
| Antenna Input: | Long wire below 1.6 MHz, HF 4/13 50-70 Ohm coaxial above 1.55 MHz |
| Sensitivity: | CW
(0.6 kHz filter): 0.2 µV(HF), 0.6 µV(LF), 3 µV(VLF) 6
dB S/N,
AM (6.4 kHz filter): 2 µV 10 dB S/N |
| Setting & Read out: | 60 - 3000 Hz in the VLF to MFranges, 200 Hz above 1.5 MHz |
| Stability: | <500 Hz at 30 MHz after warm up, drifting 10-100 Hz/°C |
| Selectivity: | 6.4/4.0/2.2/1.2/0.6 kHz -6 dB, formfactor -6/-60 dB 1:2.0 at 6.4 kHz |
| IF: | 1st
IF: 1.7 MHz >11.3 MHz, 1st IF: 0.7 MHz in the 68 - 160 kHz
and 1.6 - 11.5 MHz ranges 2nd IF: 100 kHz, single conversion <68 kHz and in the 160 - 1600 kHz range |
| IF Rejection: | >80 dB |
| Image Rejection: | Average 80 dB |
| Audio Output: | 1 W/8 Ohm, 600 Ohm line |
| Voltages: | 110/127/220/240 VAC 45-60 Hz, 160 W |
| Physical: | Cabinet Version: 565x450x460 mm, 60 kg |
| Accessories: | DM
01 for FSK, DM 02 for duplex FSK, AD 02 for diversity,
DM 03 for SSB |
| Features | |||
| - Headphone Jack (2) | - Speaker | - Speaker-Switch | - Line Out 600 Ohm |
| - BFO +/- 1.5 kHz | - S-Meter | - AF-Meter | - AGC/MGC |
| - AGC 0.1/1/10 sec. | - AGC Output Jack | - IF Output Jack | - RF Gain |
| - Calibrator 100/600 kHz | - Dial Lamps | - Dual Concentric Knob | - Tuning Check |
| - Fine Tuning | - Tube Checker | - Modular Construction | - Rack Handles |
| Circuit Complement | |
| Tubes + Semiconductors: | 8x EF 89 (=6 DA 6), 2x ECH 81 (=6 AI 8), 2x ECC 85 (=6 AO 8), 4x ECF 82 (=6 U 8), 1x E 80 CF (=7643), 2x ECL 82 (=6 BM 8), 1x EAA 91 (=6 AL 5), 1x EF 861 (=6688), 1x StR 85/10 (=0 G 3), germanium rectifiers, silicon rectifiers in PS. Most tubes can be checked by a meter. |
| Tuning: | 9 ganged variable capacitors: 4x2 in RF circuits + 1 in 1st (main) oscillator geared into 2 ganged of the selector driven by dual concentric knob. One extra variable capacitor in the reference oscillator (795–905 kHz). Above 1.6 MHz the 1st oscillator is phase locked to the product of selected spectrum and reference oscillator, converting RF to 1st IF (1700kHz, 700 kHz or 100 kHz). Coil turret. |
| Crystals: | Only 1x 600 kHz for 100/600 kHz spectrum oscillator, calibrator and 2nd Oscillator (600+1800 kHz) converting 1st IF (700/1700 kHz) to 2nd IF (100 kHz). |
| Dials: | Long drum (320 mm), fine tuning dial (100 kHz) above 1.6 MHz. |
| Comments |
| Designed for marine use, monitoring service and embassies. When importing of the West German E 104 Kw (Telefunken) wasn’t possible any more for East Germany, the engineers created a great receiver certainly orientated to the EK 07 (Rhode & Schwarz) and the E 311 (Siemens). Setting accuracy of 500 Hz was excellent for a tube receiver in these times. The 1340.21 is the predecessor of the solid state receiver EKV 10, which is much more advanced in the IF strip (triple conversion with a very high 1st IF, mechanical filters at 200 kHz, SSB). Scanning large frequency ranges is however more convenient with the 1340.21 than with its descendent. |
| Additional Information |
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On this photo the accessories AD 02 and DM 02 are shown.
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Top view of the 1340.21
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A detail of the front panel: the fine tuning dial and knob.
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The following photo shows the 1340.21 in use on board of MS "Ronneburg" (Callsign DDXO).
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MS "Ronneburg"
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