en:se-213
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+ | ====== SE-213: TLD ====== | ||
+ | **Tragbar Leichte Dezimeterstation BBC** (Portable Lightweight Decimeter Station), **SET 11/2** resp. **SE-212**; produced by [[Brown Boveri]]. | ||
+ | |||
+ | It was not before the World War II years, when interest in using high frequencies in the [[VHF]] range for communications arose also in Switzerland. | ||
+ | |||
+ | After a prototype station successfully could be used to establish a communication link between St. Chrischona near Basel and a mountain top station at Jungfraujoch, | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ===== Technical Data ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Modes]]: [[F3|FM (F3)]], F2 (frequency modulated radioteletype) | ||
+ | * [[Frequency range]]: 330 - 355 MHz | ||
+ | * [[Sensitivity]]: | ||
+ | * [[Output power]] 3 W | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | {{ : | ||
+ | * [[Mains]]: Mains power supply [[TLD-ZT]] (110, 125, 145, 205, 220, **230**, 250 V) | ||
+ | * [[Accumulator / batteries]]: | ||
+ | * [[Generator]]: | ||
+ | * [[Generator]]: | ||
+ | |||
+ | For operation, the station requires a heaters voltage of 14.5V (2.5A) and a plate voltage of 360V (120mA). | ||
+ | The station is powered by a mains power supply for stationary use. Alternatively, | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | Total weight of all station material is 214.6 kg | ||
+ | * **Receiver case**, case **E** : 363.5 x 439 x 256 mm, 27.5 kg | ||
+ | * **Accessory case**, case **Z** with the transmitter unit: 363.5 x 439 x 256 mm, 16.2 kg (with morse key, microphone, headphones, spare tubes and transmitter test lamp) | ||
+ | * **Antenna case**, case **A** with transmitting antenna SA, receiving antenna EA; 609 x 458.5 x 250 mm, 15.7 kg | ||
+ | * two **Tripods 58** for the transmit and receive antenna; 660 x 160 mm, 3.6 kg | ||
+ | {{ : | ||
+ | * **Cable case**, case **K** with feeder cables, antenna cables, etc.: 609 x 458.5 x 250 mm, 22.8 kg | ||
+ | * **Power supply unit**, case **N** with power supply unit [[TLD-ZT]]: 363.5 x 439 x 256 mm, 30.4 kg | ||
+ | * **Converter**, | ||
+ | * **Treadmill generator**, | ||
+ | * **Gasoline generator** Motosacoche, | ||
+ | * **Fuel case** with two gasoline and oil canisters | ||
+ | * **Relay and remote control equipment**, | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | * Standard antenna are two dipole antennas with reflectors; the transmitter unit is mounted directly on the transmitting antenna to keep cables short. The antennas are set up on wooden tripods, these can be stored in canvas cases for transport. | ||
+ | |||
+ | ---- | ||
+ | {{: | ||
+ | ===== Operation ===== | ||
+ | Because of the good field performance of the shortwave [[SE-210|TL station]], the TLD station was constructed following a similar concept with it's portable components. | ||
+ | |||
+ | The main part of the circuitry is found in the receiver case, the R.F. final stage and tuner is located in a small metal case (TLD S) attached to the directional antenna (to keep cable loss low), a mains power supply [[ZT-TLD]], a petrol generator and a pedal-operated generator make also part of the TLD. | ||
+ | |||
+ | The TLD is capable no only of telephony but also of radioteletype connections with the letter printer [[ETK]]; in connection with some encryption equipment, automatically encrypted communications were possible. | ||
+ | |||
+ | {{ : | ||
+ | The two final triodes in push-pull arrangement will generate 1,5 Watts output power in the 330 - 355 MHz band range. | ||
+ | |||
+ | On the transceiver' | ||
+ | |||
+ | {{ : | ||
+ | In the left upper corner, you find the connectors for the receiver antenna and the cables to the transmitter and power supply, a meter can be switched to control heaters and anode voltages. | ||
+ | |||
+ | Frequency calibration of the TLD station has to be done with the calibration pot on a frequency of 345 MHz. After this, the operation frequency can be set on the spiral dial. It is recommended to maintain a channel spacing of at least 1.2 MHz between the transmission and reception frequencies; | ||
+ | |||
+ | In receiving mode, the frequency of the other station must be located: it is tuned to the maximum deflection of the measuring instrument. After this, when the transmitter tuning lock knob is turned, the automatic frequency correction will be activated, so that the frequency should not "run away". | ||
+ | |||
+ | The station is intended for local and remote communication: | ||
+ | Because of only very few multi-channel adaptors were acquired, the TLD station was mostly used for point-to-point connections, | ||
+ | |||
+ | The operating mode switch is used to select the mode: | ||
+ | In position " | ||
+ | When the the multi-channel adaptor MK-1 (ZT 11c) is used, the cable stored in the accessory box of the multi-channel adaptor is connected to the five-pin microphone jack (" | ||
+ | |||
+ | For remote operation, a field telephone line is connected to the terminals La and Lb. In operation mode " | ||
+ | |||
+ | Of course, if the station is used as a relay station, two frequencies are occupied. With the material from the relay case, two TLD radio stations are connected, the station staff is only necessary to control the connections on both sides. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | {{: | ||
+ | In the **Transmitter** section, the AF signal coming from the microphone or a remote control site is fed to a two stage modulation amplifier (V551, V552), in modulated tone telegraphy, the further tube acts as 1000 Hz audio generator.\\ | ||
+ | The transmitter final stage is located in a small metal case, which can be attached to the transmitting antenne while the station is active. Both transmitter RF triodes (V502, V503, two [[de:LD1]]) work in a push-pull arrangement. | ||
+ | |||
+ | The receiver circuit is of single conversion design without RF preamplification: | ||
+ | |||
+ | ==== Valve Layout ==== | ||
+ | **Receiver**: | ||
+ | |||
+ | **Transmitter**: | ||
+ | |||
+ | ==== Development ==== | ||
+ | [[Brown Boveri]] delivered seven prototype stations with the designation SET 9/2 in August 1943; from the definite version with BBC designation SET 11/2 a hundred sets have been ordered in 1943 and another fifty stations in 1944. | ||
+ | |||
+ | Because of production delays in the war years (problems with valve supply due to the War and export restrictions caused Brown Boveri to produce th R.F. pentode P2 in Switzerland), | ||
+ | |||
+ | The principle operational purpose would have been the replacement of a wired telephone connection destroyed by hostile actions or a nature catatrophy by a microwave link without the communications partners on the telephone taking notice of the fact, they are not communicating over a wired network. This goal could not be reached as the number of multichannel adaptors to transmit several speech or teletype channels over one microwave link was far from beeing sufficient. | ||
+ | |||
+ | ==== Field Use ==== | ||
+ | The TLD found no good resonance with the troops, it was unreliable and the tactical commanders were not aware of the advantages of point-to-point microwave communications: | ||
+ | The station suffered from very frequent dropouts mostly from bad contacts at the valve sockets of the war production valves. Insiders knew, that the valve contacts had to be cleaned with a metal brush or the Swiss pocket knife before switching on the station. | ||
+ | |||
+ | Another problem was the fact, that with it's standard setup, the station could transmit only one channel at a time. The Swiss Army had ordered not enough multichannel adaptors - so the TLD was not perceived useful in practical use: there was no service communications channel to be used in parallel with the main operative communications channel. | ||
+ | |||
+ | The station has been in use until 1960, it has been used for isolated point-to-point connections only. Only with the introduction of the successor, the [[Brown Boveri]] made MT 3, microwave communications has found more frequent use with the Swiss Army. | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technical Manuals ===== | ||
+ | * {{: | ||
+ | * [[https:// | ||
+ | * {{ : | ||
+ | |||
+ | ==== Additional Information ==== | ||
+ | * [[http:// | ||
+ | * [[https:// | ||
+ | * [[https:// | ||
+ | |||
en/se-213.txt · Zuletzt geändert: 2019/04/21 17:20 von 127.0.0.1