The RTU-100/V radio-teleprinter system was installed in the field vehicle Zastava AR-55V and the Zastava D-2V 0.5-ton trailer. The vehicle and trailer were manufactured at the "Crvena Zastava" automobile factory in Kragujevac in cooperation with the Italian company FIAT. The station crew, consisting of three radio-teleprinter operators and a driver, was also transported in the same vehicle. The space with the driver's and front passenger's seats was separated from the rest of the cabin by a tarpaulin. All parts of the system in the vehicle cabin were secured to an iron frame, mounting frames, floor, and cabin walls.
In addition to the vehicle and trailer, the RTU-100/V radio-teleprinter system set consisted of:
Transceiver PD-6;
- was installed in a separate aluminum housing and is characterized by a modular construction. The receiver and transmitter shared common circuits and therefore operated in simplex mode. The transmitter output power of 150W (PEP) was provided by 4 powerful QE 05/40 pentodes, and a mechanical filter at 455 kHz was used in the modulator. The selectivity of the receiver was determined by 4 crystal filters at 455 kHz with bandwidths of: 250 Hz, 700 Hz, 3000 Hz, and 5000 Hz. Frequency was set in a combined manner: with two switches in steps of 100 kHz and a variable oscillator 0–100 kHz. Frequency stability was 300 Hz, which would later prove to be a major drawback for RTTY operation.
Antennas and antenna accessories;
- antenna box KA-2 was also installed in a separate aluminum housing and served for matching the transceiver to the AT-16 whip antenna.
- wire antenna AT-5 was used as a quarter-wave antenna for operation in the range from 1.5 MHz to 12.5 MHz. It was erected when maximum device range was required and when frequent relocations were not expected. Its set consisted of: an antenna mast of 8 tubular aluminum sections with a total height of 12m, a knee joint with pin and antenna insulator, 41m of antenna wire, 12 tensioning ropes for guying, 12m of KK-10 coaxial cable for connection to the device, and other parts for setup and packing. During marching it was transported in the trailer in two packages. Sections and stays in a special carrier-cover, and smaller accessories in the TB-21 bag. The complete set weighed 34 kg, and its setup required a trained and coordinated crew, so a more convenient solution was sought, but it nonetheless remained in the system set until the end.
- whip antenna AT-16 was used for transmission and reception while stationary and for reception while moving, and consisted of an antenna base and five sections with a total length of 4.7m, a guying rope, and a carrying cover. It was mounted on the rear left side of the vehicle cabin. When using it, the declared range was reduced by 20%.
Electrical power sources;
- mains rectifier MI-8 provided all voltages required for operation of the PD-6 transceiver when the RTU-100 was powered by AC voltage 220/110V. When a 12V lead-acid battery was used as the source, it operated as a voltage converter and provided voltages for the receiver operation of the PD-6 transceiver. It was housed in a separate enclosure closed with a cover.
- battery charging rectifier MI-9 was housed in a separate enclosure and was used for charging the 12V/70Ah lead-acid battery and for powering the remote keying and modulation device UK-3. Powered by AC voltage 220/110V. Maximum battery charging current 6A.
- generator AG-3 powered all consumers in the radio-teleprinter system with AC voltage 230V 50Hz at a maximum power of 2 kW. Its set also included a 12V/135Ah lead-acid battery, which was used for starting the generator. It was recharged from the generator itself at DC voltage 14V/2A. It used gasoline as fuel and was transported in the trailer.
- lead-acid battery 12V/70Ah powered the PD-6 transceiver receiver when operating in receive mode while in motion. It was placed in the compartment beneath the driver's seat.
- distribution boxes KR-4 and KR-5 were used for distributing voltages within the teleprinter system, and AC voltage 220/110V was supplied from the generator via the 5-core power cable KE-6 of 30m length.
Devices and accessories for radio-teleprinter operation and remote control;
Most of these devices are described on the telephone-telegraph devices page. They consisted of: teleprinter Siemens T-68D or "EI" Niš ET-1, telegraphic modem TG-2, telegraphic modem TG-1, telephone-telegraph filter FL-1, induction telephone M-63. For remote control via the M-63 induction telephone or for keying the transmitter during unmodulated telegraphy operation, the keying and modulation device UK-3 had to be connected in front of the PD-6 transceiver. For this purpose the system set also included two spools of PTK-56 cable of 750m each (total 1.5 km) and the cable reel ML-1.
Operating accessories;
Operating accessories are used for keying and modulation during transmission or for converting the electrical energy of received signals into sound. The accessories consisted of: Telegraph key TS-1, Handset combination MK-1, Headset SL-2, and Loudspeaker ZV-1.
In addition to the above, the RTU-100/V radio-teleprinter system set included equipment mounting accessories for installation in the vehicle, auxiliary equipment for packing gear and spare parts, various power and connecting cables, ground rod ZM-1, engineering tools (shovel and pickaxe), and a small field shelter tent for the crew.
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