Woman radio operators
Radio set RU-2/2
Radio set RUP-1B
Soviet Union radio set R-105
Description pentode GU-50
Germany pentode RV2P800
 
 
 
Radio operatorIn the Yugoslav People's Army to the radio devices, described on this page, were held the tactical radio links for small power (0.1 - 10 W) on the small distance of VHF frequency band. VHF (very high frequency) are comprise the frequencies of 30 MHz to 300 MHz and the basic characteristics of the range that the radio waves broader almost linear, not deducted from ionosphere but partly reflecting from objects. link between the two VHF radio devices is possible on smaller distances, where is the so-called radio horizon, and enhancing the power of transmitting does not affect significantly to the link shot.

Because of this fact, interception and disturb the radio link in this area is difficult so VHF radio connection are using today in all armies. Most often modulation is FM (frequency modulation) or in modern solutions SSB (single-sideband), while in aviation is still in some places kept classic AM (amplitude modulation).

Summary Info for VHF Radio Sets
click to mark devices
 
MARK
TYPE
FREQUENCY RANGE
MOODULATION
TX OUTPUT
ORIGIN
 
receiver
52 - 60 MHz
FM
-
ex Yugoslavia
  Torn.Fu.d2 transceiver 33.8 - 39.0 MHz AM, CW 1W ex Nazi Germany
  A -7- A transceiver 27 - 32 MHz FM 1W ex Soviet Union
 
transceiver
52 - 60 MHz
FM
0.3W
ex Yugoslavia
 
transceiver
52 - 59.95 MHz
FM
0.3W
ex Yugoslavia
 
transceiver
38 - 54 MHz
FM
0.5W
ex Yugoslavia
 
transceiver
27 - 39 MHz.
FM
0.5W
ex Yugoslavia
 
transceiver
36 - 46.1 MHz
FM
1W
ex Soviet Union
 
transceiver
20 - 22.375 MHz
FM
16W
ex Soviet Union
 
transceiver
20 - 51.5 MHz
FM
20W
ex Soviet Union
 
transceiver
20 - 69.975 MHz
FM
30W
ex Yugoslavia
 
transceiver
30 - 69.95 MHz
FM
0.9 - 1.8W
ex Yugoslavia
 
transceiver
30 - 69.95 MHz
FM
1.4W
ex Yugoslavia
 
transceiver
34 - 36.5 MHz
CW, SSB
20W
ex Yugoslavia
  RT-20TM transceiver 34 - 36.995 MHz MCW,SSB,FM 20W ex Yugoslavia
 
transceiver
156 - 174 MHz
FM
0.6 - 0.9W
ex Yugoslavia
 
transceiver
149 - 154 MHz
FM
0.6 - 0.9W
ex Yugoslavia
  UKT FM 66/17 transceiver 149 - 154 MHz FM 10W ex Yugoslavia
  MRS 520-42/Ke transceiver 149 - 154 MHz FM 20W ex Yugoslavia
 
Description VHF Radio Sets

RP-6 VHF Radio ReceiverRP-6 VHF Radio Receiver

Very small 5 channel crystal controlled super-heterodyne VHF FM receiver, developed about 1978 in "RIZ Zagreb" factory - Croatia.

Technical Specification: Frequency range: 52 MHz - 59,95 MHz 5 crystal controled chanels (50 KHz channel spacing); Modes of Operation: FM (frequency modulation); Audio power output: Max 10 mW into 200 Ohms impedance; Power Requirements: 9 VDC dry battery; Power consumption: Max 20 mA; Dimensions (W*H*D): 75*120*42 mm; Weight: 0,62 Kg. Origin: ex Yugoslavia

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Torn.Fu.d2 VHF Radio Set

VHF radio set Torn.Fu.d2 equipment is added to the Yugoslav Army as part of the prize of war. The product is manufactured in Germany 1935. for needs of German ground forces and it was found that it is used and the Luftwaffe. In this device from Yugoslav People's Army maintained the tactical radio links.

Torn.Fu.d2Receiver Torn.Fu.d2 enabled the work of amplitude modulated (AM) and telegraphy (CW) in the frequency range from 33.8 MHz to 39.0 MHz. Transmitter output power of 1 W. Links range of the device in the telephony was 3 km and 10 km in the telegraphy. The set is powered by 2 VDC from battery type 2B38 and two serial-related anode battery of 90 VDC (type DIN1600). It was made in the technology of tube (see electric schema). Transmitter had three tubes: two pentode RV2P800 and one triode RL2T2. Receiver has six pentode RV2P800.

Torn.Fu.d2 is housed in two metal boxes. In first one transciever was difficult 17 kg, and in other were batteries and accessories whose weight was 18.5 kg. The device was set vertical rod antenna length of 2m. The antenna could be set directly on the device or allocated on a small base.

Radio device Torn.Fu.d2 has long maintained the equipment Yugoslav Army. Shortly after WW2 are replaced with the modern U.S. and Yugoslav tactical VHF devices.

Technical Specification: Frequency Range: 33.8 - 39 MHz, Output Power: 1 W; Modes of Operation: AM; Power Requirements: 2 VDC Battery and 90 VDC batery; Origin: ex Nazi Germany.

   
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A-7-A Radio Set

A-7-A Radio SetVHF radio set A-7-A was, in the equipment of the telecommunications division Yugoslav Army, found as part of post-help Soviet Union of Yugoslavia. This device is made when constructional team which was headed by Georgij Trofimović Šitikov received 1938. the task to create a portable VHF radio device. So at the end of 1940. is made radio set type A-4. At the same time testing is continued and 1941. was designed radio station A-7. Instead AMA-7-A transceiver modulation (as applied inradio set A-4) introduced the FM modulation. It was the first radio device with FM modulation of the Soviet production. A-7 radio set in the weapons introduced during the battle of Stalingrad. Modernization is continued (reduced consumption by 30%, improved sensitivity receiver) and 1944. the model A-7-A was designed soon on december 1944. also the model A-7-B. At the end of the war manufacture about 4,000 sets a month.

Radio set A-7-A is made in the technology of tube (see electric schema) a device characteristics are: frequency range from 27 MHz to 32 MHz, tipe mode of operation - frequency modulation (FM), 1W output power transmitters, antenna vertical rod. Links range of the device in the open ground was 7-8 km, in the city of 3-4 km. Transmitter,equipment and power in a wooden box that served to transport and work. Weight, without sources ofA-7-A Radio transceiver power, was 15.5 kg. It is powered by rechargeable 2.4 VDC battery type 2NKN-10 and two anode batteries type BAS-80 serial related (160 VDC).

After 1948. and interruption of relations with the Soviet Union of Yugoslav People's Army faced with the lack of spare parts for Russian equipment carried out the modification to the original Russian station and electronic tubes replaced with tubes of USA production. Soon the radio set has been withdrawn from the weapons because he was replaced by the Yugoslav tactical VHF radio stations.

Technical Specification: Frequency Range: 27 - 32 MHz, Output Power: 1 W; Modes of Operation: FM; Power Requirements: 2.4 VDC Battery and two 80 VDC bateries; Origin: ex Soviet Union.

 
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RUP-3 Radio Unit

VHF tranceiver RUP-3 is produced in the beginning of the '60-years in "RIZ Zagreb" factory (ex Yugoslavia). He is made for the maintenance of the radio-telephone connection to the shorter distance (from 0.5 km to 3 km depending on the configuration of the ground). He served of the primary radio device for leader of infantry platoon Yugoslav People's Army.

RUP-3 Radio Set VHF tranceiver RUP-3Technical Description: Frequency range from 52 MHz to 60 MHz on five channels controlled quartz crystal. Tipe mode - FM (frequency modulation). Transmitter power output of 0,3 W. Powered by in the first years with two steel accumulator 9 VDC or 4 batteries of 4.5 VDC , and later with two 8.4 VDC 500 mAh NiCd batteries type 7ACH-1. It was made in the technique of germanium transistors of Yugoslav production.

Set of the device consisted: tranceiver, rod antenna type AT-9 made of steel bar, wire antenna type AT-10 from the isolated coppers glance wire length of 4 m to achieve greater reach (was set only at the beginning of production of the device, and later was dropped as unnecessary), handset type MK-2, sources of electrical energy, bag for carrying type TB-5, belt for carrying and spare crystals in the box.

Technical Specification: Frequency Range: 52 - 60 MHz, Output Power: 0.3 W; Modes of Operation: FM; Power Requirements: two 8.4 VDC 500 mAh NiCd batteries; Origin: ex Yugoslavia

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RUP-33 Radio Unit

RUP-33 Radio Set Tactical VHF radio unit was manufactured in "RIZ Zagreb" factory (ex Yugoslavia) in 1978. and was a completely new solution in relation to the Radio set RUP-3. Also as RUP-3 has frekvency range from 52MHz to 59.95 MHz frequency modulation FM, but had direct frequency synthesizer and channel was choseing with three selectors. Transmitter output power is the same - 0.3 W. It is powered by two 8.4 VDC 500 mAh rechargeable NiCd batteries type 7ACH-1, produced in the factory "Krusik" - Valjevo (ex Yugoslavia), or in the far needy 4 of the 4.5 VDC batteryRUP-33.

In the development of applied technology printed circuits, MOSFET transistors and integrated circuits. In the receiving part intermediate frequency amplifier there is a crystal filter Institute Mihajilo Pupin (ex Yugoslavia), which increased sensitivity and resistance to interference device. Set of the device consisted: tranceiver, rod antenna type AT-11, handset type MK-2A, sources of electrical energy, bag and belt for carrying.

Technical Specification: Frequency Range: 52 - 59.95 MHz, Output Power: 0.3 W; Modes of Operation: FM; Power Requirements: two 8.4 VDC 500 mAh NiCd batteries; Origin: ex Yugoslavia

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RUP-1, RUP-2, RUP-1B, RUP-2A and RUP-2B Radio Set

RUP-1 Radio SetThe first Yugoslav radio devices manufactured in a factory "Rudi Čajavec - Banja Luka" 1958. designed for tactical VHF links. Radio sets RUP-1 and RUP-2 based on the concept ofRUP-1B Radio Set U.S. Radio set BC-1000 (which, as part of military assistance, was already in the equipment of Yugoslav People's Army). RUP-1 and RUP-2 are varied only by the frequency range.

Radio set RUP-1 had the frequency range from 38 MHz to 54 MHz and Radio set RUP-2 from 27 MHz to 39 MHz. Type of the modulation FM and change of the frequency with variable frequency oscillator (VFO). Transmitter’s power output was about 0.5 W. He was powering on with 4.8 VDC from the two "steel" batteries (as electrolyte used potassium hydroxide) over the transistor converters type PT-1 power 20 W, which is providing the necessary DC of 90 V, 120 V and 150 V DC. Alternatively, could be used dry battery type BAJ-70 (given the DC of 4.5 V, 60 V and 90 V DC). As at U.S. BC-1000, a microphone and headset are switch-fuse in separately with 6.3 mm plug. The device was made in technology of electronic tubes.

For unification Yugoslav radio device was done the modification and produced the "B" versions (Radio set RUP-1A,B RUP-2A Radio Setand Radio set RUP-2B), which was different from "older" only in having standard Yugoslav People's Army military connector for headsetBC-100 Radio Set.

Radio sets RUP-1 (B) and RUP-2 (B) packed in three mutually shift lock associated metal box. In the upper was the tranceiver, in high voltage converter type PT-1 with two "steel" batteries and in the bottom microphone, headsets, cables and accessories. Mass of the set was 19.5kg.

Technical Specification: Frequency Range: RUP-1 38 - 54 MHz and RUP-2 27 - 39 MHz, Output Power: 0.5 W; Modes of Operation: FM; Power Requirements: two 2.4 VDC "steel" batteries;
Origin:
ex Yugoslavia
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R-105, R-108 and R-109 Radio Set

R-109 Radio SetR-105 Radio SetR-105, R-108 and R-109 radio set are imported together with the Russian radio teleprinter systems and armored vehicle about 1960. How is produced in the same year Yugoslav radio set RUP-12, which is by its technical performance was in front generation , these devices were not found their use a lot in the YugoslavArmy.

R-105, R-108 and R-109 are different by frequency range (R-105 from 36MHz to 46.1MHz, R-108 from 28MHz to 36.5 MHz and R-109 from 21.5 MHz to 28.5 MHz). Output power is about 1W, and have frequency modulation - FM. Change of the frequency is by variable frequency oscillator - VFO. Connecting on intensifier the UM-3, power output is received of 50W,R-105M Radio Set which is provided by known "Russian" pentode GU-50. They are made in technology small-buttion tube. It is powered by rechargeable 2,4 VDC 22 Ah "steel" batteries of type KNP-20.

Technical Specification: Frequency Range: R-105 36 - 46.1 MHz, R-108 28 - 36.5 MHz and R-109 21.5 - 28.5 MHz, Output Power: 1 W; Modes of Operation: FM; Power Requirements: 2.4 VDC "steel" batteries; Origin: ex Soviet Union.

   
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R-113 "Tank" Radio Set

R-113 Tank Radio SetR-113 HF radio device was produced 1950. in the Soviet Union. He is imported as one of the links devices in the armored carrier BTR-50PU, which is in the higher commands served as mobile command position and in armored units as a command vehicle. He also found his used in Soviet tenks T-55, which were in armament of Yugoslav Army. He is made for link between armed vehicles in the stay position and in movement with frequency modulated telephony (FM), in the frequency range from 20 MHz to 22.375 MHz. Because of frequency rang they should be put in HF radio devices, but in use and the fact that the link is served with surface component electromagnetic waves, we classified it in this group with other "tank" devices.

R-113 Tank radioFrequency is controlled by quartz oscillator, on 96 fixed frequency and the space between the channel was 25KHz. Output power transmitter was 16W and is get from the well-known Russian electronic tube GU-50, which is located in the power amplifier. They reach long range over 20km. Receiver was super-heterodyne with three pane conversion, a complete device was made in the technology of electronic tubes, 20 type of 12ŽIL and one the GU-50. He is powering on through its dynamo converters type BP-2A with 26 VDC voltage or 13 VDC from the installation of vehicles. To manage the device is used tank`s headset with guttural microphone type LEM-3 and a headset type TA-56M. For the work was used rod antenna of 4 article length 4m.

Technical Specification: Frequency Range: 20 - 22.375 MHz, Output Power: 16 W; Modes of Operation: FM; Power Requirements: 26 VDC voltage or 13 VDC;Origin: ex Soviet Union.

       
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R-123M "Tank" Radio Set

Another tank`s device which was very well known in armored units, because he could be found in Russian armored vehicles. Radio operators was worked with him in command armored carrier BTR-50PU, where he has served for the radio link between the command and mutual commander and subordinate units, in other words he served between R-123M Tank Radio Setarmored units and infantry units.

Frequencies in which he worked have entered in the top of the HF range (from 20MHz to 51.5 MHz), a type of modulation was the frequency modulation (FM). HeR-123M Radio Set has 1261 frequency channel. Frequency was divided in two ranges: 20MHz to 35.75 MHz and 35.75 MHz to 51.5 MHz. Space between the channel was 25 KHz. Transmitting power output is 20W, and he reached the long range of 20 km. Device is managed directly through the device for inter-talk R-124 (BTR-50PU) and it is used tank`s headset. He is provide for work with rod antenna length 4 m, or backup antenna made of copper conductor length 3m. He is powering on  over transistor converter type BP-26 26 VDC voltage from the installation vehicles.

Technical Specification: Frequency Range: 20 - 51.5 MHz, Output Power: 20 W; Modes of Operation: FM; Power Requirements: 26 VDC voltage;Origin: ex Soviet Union

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RUT-1 "Tank" Radio Set

RUT-1 tranceiverIn the development of Yugoslav combat vehicles (conveyors and tanks) pointed out the need to be installed in the same Yugoslav-radio devices. For this purpose, early 1970. "Rudi Čajavec" factory from Banja Luka produced a VHF radio and low-power device called the RUT-1. In addition to their primary purpose (The telephony links between combat vehicles) and provide internal communication between members of the crew, whose voice is difficult because of maintenance noise and vibration. Radio set RUT-1 meet the tactical and technical requirements and has proved to be compact and durable and soon became a eulogistic of tank and armoured brigades members of the Yugoslav People's Army.

RUT-1 device of work is the frequency modulation (FM) in the frequency range from 20 MHz to 69.975 MHz. Working frequency is controlled frequency synthesizer, and asked directly 4-fold in steps of 25 KHz between the business channel (a total of 2,000 channels). For fast operating frequency changes, it could be with the help of patterns - a programmer to determine 10 business channel and the transition from one to another is then carried out a special RUT-1 Tank Radio Setswitch. Full output power transmitters was 30 W, reduced to 5 W and 2 W small 0.1 W to 0.2 W. Links range of the RUT-1 device in the open ground was 20 km. Internal communication among members of the crew was maintained with the help of the device for mutual conversation with maximum of 5 participants, the maximum audio power of 1.2 W. The main source of electric power network is one of the vehicles 26 VDC (variations of 30 VDC to 22 VDC).

PD-9 tranceiver A set of radio devices RUT-1 did the transceiver type PD-9, the main broadband rod antenna type AT-22 from three article length 3.55 m (if needed could be reduced to two articles and then was 2.6 m long), supporting rod AT-23 antenna length of 1.5 meters and the device for inter-talk type UMR.

Schematic RUT-1Device for inter-talk (UMR) consisted of the main control box type UK-9 who can join the two PD-9 transceivers, there were out audio intensifier for intercom connection. It is also used for the selection of types of work (internal network, the first or second radio device) and throughit that box UK-9 was driven DC to power radio devices. Device for inter-talk - UMR also had control box UK-8 (5 pieces) that conect 5 tanks headset type SM-1, and their task is to reinforce signal throat microphone (guttural microphone in headset) and enable the transition from internal communication to the radio through the device and vice versa. Also, there were control boxes: one type UK-10 and two type UK-11 with a compatible cable coupling. (See chart connections).

The device is made in transistor technology. Transmitter is very stable and resistant to strikes and shakes with sufficient output power (30 W), and both antennas are adjustable in the entire frequency range. Receiver is very sensitive, superheterodyne with the first intermediate of 10.7 MHz. His quality control bandwidth crystal filter Institute "Mihajlo Pupin", Belgrade, on the second intermediate 455 KHz, where we have the same ceramic filter manufacturer.

Technical Specification: Frequency Range: 20 - 69.975 MHz, Output Power: 30 W; Modes of Operation: FM; Power Requirements: 26 VDC voltage; Origin: ex Yugoslavia

 
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R-1230 "UGAR" Romanian "Tank" Radio Set

This radio device we are describing in our site because it is a Rumanian variations of VHF Radio Set RUT-1 production, "Rudi Čajavec - Banja Luka" factory. Devices have the same external appearance, technical features and additional accessories. It is based on the less well-known cooperation military radio industry Romania andR-1230 "UGAR"Yugoslavia.Otherwise, this military-technical cooperation of two country 70-years is well known to the public by the project "YUROM", a together production of aircraft ("Orao" - Yugoslav name which means eagle and "IAR-93" - Romanian name).

Military industry Romania produced a VHF radio device type R-1230 "UGAR" in the beginning of the 80-years. Romanian Army this device replaced in 1982. the Russian tank radio devices R-123 on their tanks T-55, TR-580 and TR-800. This device was withdrawn from use in 2002. (Description and photos: Tudor, YO3HBN, Romania).

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RUP-12 Radio Set

RUP-12 Radio SetVHF radio set type RUP-12 was manufactured in "Rudi Čajavec - Banja Luka" factory (ex Yugoslavia) in 1966. and was replaced pre-existent tactical VHF radio stations low power BC-1000, RUP-1, RUP-2 and other developed in the tube technology. The formation of units in Yugoslav People's Army RUP12 was a basic radio device captain of infantry companies, and with this device is implemented also VHF radio links in the higher headquarters, where is assembled in various radio-telephone, radio teleprinters and other systems.

He has worked in the frequency range from 30 MHz to 69.95 MHz with frequency modulation to 800 of the channel. The frequency was controlled by the direct frequency synthesizer and it was set with three selectors in steps by 50 KHz. Output power transmitters was from 0.9 to 1.8 W. He was powering on with DC voltage of 12 V. At the beginning for powering on 12 VDC - 6 Ah lead battery or dry battery BAJ-13,5 (13.5 V). Later, power on was performed from 12 VDC 7 Ah NiCd batteries, production of "Krusik" Valjevo factory, or external source of 12 VDC or 24 VDC through converters PT-6. On the receiving device was consumption 85 mA and on the transmitting about 750 mA. Weight data sets is 12 kg.

RUP-12 control panelLink range of RUP-12 was depend of used antennas and the place of setting. In the valley, with a long rod antenna was 8 to 12 km. Connecting the two devices RUP-12 with the appropriate adapter and their setting to a sublime place could form amplifier station (radio repeater) and increase the link range between outerly devices. He has done automatically or manually, depending of the signal of outerly devices RUP-12, because he has activated a signal from the squelch system.

RUP-12 VHF Radio SetRUP-12 was made completely in transistor technology and they were of mainly Yugoslav production. Receiver sensitivity was 1.2 μV. Limited of bandwidth in intermediate frequency was amplifier by crystal filter 10.7 MHz made in the Institute "Mihajlo Pupin" and it was getting good selectivity of + / - 15 kHz. Deviation of working frequency from transmitters from the set, was less than + /- 2 kHz.

Portable radio device set Rup-12 consisted of transceiver type PD-7, sources of electricity (batteries), carrying bags type TB-17, accessories for serving (handset MK-1 and headphone SL-1) and three antennas (long rod type AT-17, short rod type AT-19 and wire antenna type AT-18 on the principle of progressive waves). Vehicle set, along the parts that are in portable set, more contains transistor converter type PT-6, rod antenna AT-7 and other equipment for installation in the vehicle.

Technical Specification: Frequency Range: 52 - 59.95 MHz, Output Power: 1.8 W; Modes of Operation: FM; Power Requirements: 12 VDC 7 Ah NiCd battery; Origin: ex Yugoslavia

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RU-2/2 VHF radio deviceRU-2 Radio Set (RU-2/1, RU-2/2 and RU2/2K)

RU-2/1 VHF radio deviceFamily of VHF radio devices type RU-2 (RU-2/1, RU-2/2 and RU2/2K) was manufactured in factory "Rudi Čajavec" Banja Luka (ex Yugoslavia) by the end of the 70's. The device externally looks completely like a Radio set RUP-12, because it uses the same chass, set of tools and sources of power supply. The factory "Rudi Cajavec" constructed this device using the block scheme for RUP-12, but is applied modern technology, so we can freely say that this is a completely new solution.

RU-2/2 VHF radio deviceRU-2/2K VHF radio deviceIn the Radio unit RU-2 is applied technology printed circuits. Also, there are applied modern semiconductor (MOSFET transistors and integrated circuits), that are partly imported, and mostly of Yugoslav production.

The intermediate frequency amplifier is with integrated circuits and a crystal filter of higher quality, built by the "Mihajlo Pupin" institute of Belgrade (ex. Yugoslavia).

Radio device RU-2 is also reminiscent of the Radio set RUP-12 by its basic technical characteristics. Frequency range from 30 MHz to 69.95 MHz, 800 channels with the space between the channels of 50 KHz, it's set with three selectors. The frequency is controlled by a direct frequency synthesizer. The transmitting power output is 1.4 W, it provides the broadband transistor amplifier and it's a real shame that the constructor hadn't found a way to raise the power output to 5-6 W, because the shell and the circuit feed easily allow it. The device has an FM modulation. Powered by standard Yugoslav People's Army 12 V 7 Ah NiCd battery pack type 10KA-6, producted by "Krusik" Valjevo factory , or external 12 VDC sources.

power amplifier P-25speech cipher KZu-63Radio set RU-2 has been designed to provide command link at battalion and company level, all the same became the universal VHF radio set in the Yugoslav Army. Served as a portable device, or was built into HF radio stations. There was a separate and special force power amplifier P-25 built for this device, that helped achieve the power output of 20 W. There was a device for the protection of speech cipher KZu-63, that was attached to the RU-2/2K version.

Technical Specification: Frequency Range: 52 - 59.95 MHz, Output Power: 1.4 W; Modes of Operation: FM; Power Requirements: 12 VDC 7 Ah NiCd battery; Origin: ex Yugoslavia

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RT-20-TC6 Radio Set

RT-20-TC6 Radio setRT-20-TC6 Radio deviceRT-20-TC6 VHF radio device was produced by factory "Iskra" from Ljubljana (ex Yugoslavia), in 1972. The operate is in the frekvency range of 34 MHz to 36.5 MHz, with 6 crystal controlled channels. The modulation was SSB and CW and the transmitter output power was 20 W. It is powered by 12 VDC rechargeable 7 Ah NiCd batteries type 10KA-6, producted by "Krusik" Valjevo factory.

RT-20-TC6 SetIn the Yugoslav People's Army generally is used for link beetwen Yugoslav Army units end Territorial defence units. Since its introduction to its cancellation, it hasn't been used much in the mobile links of the Yugoslav Army, because all other radio devices (RUP-12, RU-2, RUT-1...) were working in this range using frequency modulation (FM), so a mutual connection was possible only between these two RT-20-TC6 devices, or with other compatible devices, like radio sets type: RT-1-T4, RT-1-T600 and RT-20TM produced by "Iskra" factory, but they were used in Territorial defense units.

Technical Specification: Frequency Range: 34 - 36.5 MHz, Output Power: 20 W; Modes of Operation: SSB and CW; Power Requirements: 12 VDC 7 Ah NiCd battery; Origin: ex Yugoslavia

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RT-20TM (RUP-20) Radio Set

RT-20TM Radio setTo "bring to life" their RT devices, that are using SSB modulation of the tactical VHF, "Iskra" factory from Ljubljana (ex Yugoslavia) produced a VHF radio device type RUP-20. To ensure compatibility with generally accepted devices in tactical VHF, of the type RUP-12, RUT-1, RU-2/1, RU-2/2, RU-2/2K, the ability of frequency modulation (FM) was added. "Iskra" factory intended RUP-20 for military sales, but the Yugoslav People's Army didn't accept this device because it came late, and was already equipped with RU-2/1, RU-2/2 and RU-2/2K (frequency range of 30-70 MHz) and RUT-1 (frequency range of 20-70 MHz), and this device is in the narrow frequency range from 34 MHz to 37 MHz.

RT-20TM radio deviceSince the Yugoslav People's Army hadn't bought and accepted the Radio set RUP-20 (as well as other "Iskra" factory devices family RT), "Iskra" renamed this device RT-20TM control panelthe Radio set RT-20TM. The device is delivered to the National Defence, Territorial Defence and the Anti-aircraft warfare, that have already been equipped with devices RT-20-TC, RT-1-T4 and RT-1-T600.

Technical specifications: Frequency range of 34 MHz to 36,995 MHz. The frequency is controlled by a synthesizer, in jumps of 5 kHz (600 channels). Modes of Operation - SSB telephony, amplitude modulated telegraphy (MCW) and frequency modulated telephony (FM). Output power of the transmitter is 20W (reduced 6W and 2W). Sensitivity of the receiver 1μV. The powered by 12 VDC rechargeable 7 Ah NiCd batteries. Weight of the set 30 kg.

Technical Specification: Frequency Range: 34 - 36,995 MHz, Output Power: 20 W; Modes of Operation: FM, SSB and MCW; Power Requirements: 12 VDC 7 Ah NiCd battery; Origin: ex Yugoslavia

   
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UKT FM 66/13 and UKT FM 66/13i VHF Radio Unit

VHF radio devices UKT FM 66/13 and UKT FM 66/13i produced by factory "Ei Pionir" from Zemun (ex Yugoslavia), were made at the end of 60''s, and they are intended for different users to maintain of VHF connection in radio-phone range on the shorter distance whose links range could increase by the use of radio repeaterRadio device UKT FM 66/13.

Radio device UKT FM 66/13iDuring the years of production , the device is made in multiple versions. The first two versions were UKT FM 66/13 and UKT FM 66/13i (the letter "i" were signify dispart handset, while the 66/13 had inject speaker and microphone in the case). In the beginning antenna was the telescope , 1/4 wave length, and the device was wearing suspended on the thin shoulder strap. Later, the device is equipped with the practical, whip antenna and in equipment was leather bag, which was wearing also on the shoulder.

Frequency range was from 149 MHz to 154 MHz, or 156 MHz to 174 MHz. Work was on the 5 channels. Space between channel 25 KHz (the first versions of 50 KHz). Type of modulation - frequency modulation (FM), and the output power of transmitting 0.6 to 0.9 W.

In the development of transistor technology, and it were used germanium PNP transistors of the company SGS (IW9549, IW9374 ...), also transistors AFY-12, AF124 ..., and only the output level of transmitters carried bipolar junction transistors type 2N4427, 2N3553 or 2N3866. Radio transmitter was working on the principle of crystal oscillator, phase modulation and frequency multiplication (here 24X and maximum deviation of +/- 5 KHz). Receiver had first IF on 10.7 MHz (at the beginning on 10 MHz) and second IF on 455 KHz. It was powering on with NiCd battery of 12 VDC 450 mAh, production by "Krusik" Valjevo.

Technical Specification: Frequency Range: 149 - 154 MHz, or 156 - 174 MHz; Output Power: 0.6 - 0.9 W; Channel Spacing: 25 KHz; Modes of Operation: FM; Power Requirements: 12 VDC NiCd Battery; Origin: ex Yugoslavia

   
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UKT FM 66/17 VHF Radio Station

UKT FM 66/17 Radio Set MRS 320-22 Radio Set VHF radio device UKT FM 66/17 is also a product of the “EI-Pionir” factory from Zemun (ex Yugoslavia) made in 60''s. Device is made to maintain a link in the VHF radio-telephone range from 146 MHz to 174 MHz. This frequency band assigned to the users who have the need for radio links to the shorter distances. Factory “EI-Pionir” was offered that users the Radio set UKT FM 66/17. Device is producted in multiple versions, depending on the purpose (mobile or stationary), and depending of the user (army, police, companies, institutions, and the others. It can be said that this is a radio device that was the highest produced, and it was used the most in the former Yugoslavia. Otherwise, it is the first fully European semiconductor 10W VHF radio device, that was powering on directly from 12 VDC installation vehicles. Before that, only the firm "Storno" (Denmark) produced semiconductor device that was powering on from installation vehicles in 24 VDC voltage.

Yugoslav People's Army was whit this device equipped a large number of their vehicles and army used this devices as stationary radio station. To stationary Radio station UKT FM 66/17F could be added a special telephone Speech cipher KZu-64adapter over which was done connecting to the telephone network. With setting the radio repeat devices (for example Radio repeat RRS/FRS 420-4 from the same manufacturer) is formed VHF radio-telephone network which covered the entire state territory and that network connect to its system of telecommunication. To about 500 devices UKT FM 66/17 and 40 radio repeats RRS / FRS 420-4 it was made adjusted to work with on external device for the protection of speech. Devices were named as Radio set UKT-FM 66/17K (Radio repeat RRS / FRS 420-4K), as a outside device for the protection of speech it was used Speech cipher KZu-64, which is also produced in the factory “EI-Pionir” from Zemun.

Technical characteristics of this device, which will be presented here, related to "military" version of Radio set type UKT FM 66/17. The devices of other users are mostly varied by the frequency range and number of channels. Also, “EI-Pionir” was by the time performed the modifications and that devices were named different. so we have signs radio station UKT FM 66/18, MES 320-xx (for example 22 channel - Radio station MRS 320-22).

Radio station UKT FM 66/17Radio set UKT FM 66/17 was worked with frequency modulated (FM) telephony, simplex or repeats in the frequency range from 149 MHz to 154 MHz. Frequency was set with selector on 22 channels. Space between nearby channels was 25 KHz, and the maximum frequency deviation was + /- 5 KHz. Output power of transmitter was 10 W, a receiver had input sensitivity better than 0.6 μV. Audio output power in the loudspeaker was 1 W - 8 ohm. The device was powering on by 12 VDC voltage from the installation vehicles. When the device was used as stationary radio station it was powering on from electric arc valve 220 VAC voltage. At the transmitting the device was spending 2.3 A, and at the receiving 700 mA on the audio power of 1 W. Mobile radio device set UKT FM 66/17 consisted of transceiver, microphone, loudspeaker and antenna.

Technical Specification: Frequency Range: 149 - 154 MHz, Output Power: 10 W; Modes of Operation: FM; Power Requirements: 12 VDC; Power consumption: TX 2.3 A - RX 700 mA; Origin: ex Yugoslavia

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MRS 520-42/Ke Radio Unit

Radio set MRS 520-42/KeFactory “EI-Pionir” from Zemun (ex Yugoslavia), is in 1985. entered in the production of dedicated VHF/UHF receiver family called MRS-500/Ke. For the purposes of the Yugoslav People's Army “EI-Pionir” was started in 1991. with production of mobile VHF radio devices MRS-520V/Ke for ground units and MRS-520M/Ke for the Navy. Devices were robust and reliable design they guarded work from the vehicle or as stationary radio station in the strictest conditions of exploitation. Radio devices were heaving built interface to connect external devices for the protection of speech cipher KZu-64. Instead of handset it was used standard dynamic microphone type MI-2, and all commands with KZu-64 were transferred to the front panel radio devicesSpeech cipher KZu-64.

The device supplied ground units was marked with Radio set MRS 520-42/Ke. It was worked with frequency modulated telephony (FM), simplex (16 channels), repeats (34 channels) and inverted repeats (33 channels) in the frekvency range of 149 MHz to 154 MHz (Navy version had channels and the International Maritime Services). The frequency has been controlled by synthesizer. Transmitting power output was 20 W.

The device was powering on by 12 VDC form battery of vehicles, and in case of 24 V installation of vehicles, over voltage converters 24V/12V type BN-24/12-10. When the device was used as stationary he was powering on from the electrical network 220V/50Hz over electric arc valve 13.5 VDC 6 A type SIP-500, which served as a battery charger. This device is modified in the SIP-500 (6+6)Z (plane 6 A, 6 A battery charger with integrated speaker). For powering on of device MRS-520M/Ke on the boats Navy from 24V DC network of boats or from network of 220V/50Hz is used a version of the PIS-500 (6 +6)Z.

Technical Specification: Frequency Range: 149 - 154 MHz, Output Power: 20 W; Modes of Operation: FM; Power Requirements: 12 VDC; Origin: ex Yugoslavia

More about this family of devices can meet the official site of the factory Ei Pioneer UKT Ltd. - Zemun.

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Information and photos: MM Damnjanović
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