Radio R-105M-UM2/3

                                                                         Russian  Manpack Tranceiver

Russian R-104M
Radio R-105M-UM2/3
Radio R-105/108D
Radio R-107
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Radios in the field
Transm 100 W.s
"Dorette "

             Tornister gerate R-105/108/109 the only changes are the space in frequencies.Technical alike                                inside and outside.The only is the color on the box.marking the frequencies.



                   KNP-20 Batt 2.4v-22Amp

The P-105M transceiver was developed in the early 60's as a replacement for the P-105D family of manpack transceivers. Used by Russian and East German armies, primarily by Infantry for Company to Battalion communication. Operating in one continuous band and output power of approximately 1 Watt. Modulation FM. Powered by two sets of 2.4V rechargeable  batteries.

   R-105 Russian Back Pack Set  
The most common of all the Russian radios to be found  all over the world, is the R-105 family of backpack radios. The radio is rather primitive by anybody's standards, it is not easy to use, nor does it have any saving graces save one, "If you fire one up, it usually works". First introduced in the early 1950's, it was revamped in the 1960's to use more modern materials ( D models ), and again in the 1970's ( M models ). It has been referred to by many as a slightly updated copy of captured WW II German sets and many of it's characteristics, and accessories will show this lineage.

Frequency ranges:
R-105 M: 36.0... 46.1 MHz.                      
R-108 M: 28.0... 36.5 MHz
R-109 M: 21.5... 28.5 MHz
Mass + weights:
Radio: L/b/h: 310 x 170 x 325 mm; 14 kg.
Wooden box: L/b/h: 620 x 350 x 420 mm; 40 kg.
Transmitting power
approx. 1 Watt.
Frequency departure
+ - 4 kHz, which can be controlled with the inserted xtal calibration generator.
2 UV during signal/signal-to-noise ratio of 20 dB.
Wooden box containing:
Radio, radio operator`s bag, antenna bag, antenna foot for board aerial, coaxial cable for board aerial,
In the radio operator`s bag,
Telephone handset, long wire antenna, hand lamp, screwdriver.
In the antenna bag:
Long wire antenna (Beverage), 40 m, 6 timber columns, 4 herrings with anchoring wire
Battery used: Types of battery
Radio R-105M opened.

   R-105 M (R-108m, R-109 M) is a portable and a mobile backpack. Operating mode is F3 (FM), simplex. It can be operated by remote control and used at relay operation

The short antenna supplied (Kulikow) with the sets is unique in design and also reminiscent of it's WW-II German ancestry. Constructed of a series of aluminium beads strung on a steel cable, a stiff spring on the end keeps pressure against these beads and a semi rigid but flexible antenna. Releasing this spring tension collapses the antenna allowing it to be rolled up for easy storage. Better than the British system on the PRC-349, US SCR-300, and anything produced in WW II, but still not as good as the U.S. "Stanley" tape configuration that's been in use since 1949 Though the R-105M series had been reported to be out of production before 1987, the following provided by one of the radio collectors group would tend to indicate that it was produced longer than officially thought. Further, it might reflect the build up of all armaments, due to the hostilities between Iraq & Iran

The R-105M is made from the same earlier aluminium alloy princip with chambers for every radio functions.The oscillator is capsuled into a unit and work as TX and RX oscillator.As the "father" R-105/108/109D the receiver have a automatic AFC controll tracking the receiver on to TX frequency if the other radio´s tx is of frequency.This shure,could be turned off and on.  Tubes: 1P24B, 1SH17B, 1SH18B

                     Tube TX poweramplifier 1P24B

Name 1P24B
Type High-durable penthode
Application Oscillation and power amplification in mode B
Cathode type oxide,direct heating
Envelope glass,miniature
Mass,g 5,5
Filament voltage,V 1,2
Filament current,A 0,22-0,245
Anode voltage,V 150
Anode power,W 4
Grid1 voltage,V minus 14
Grid2 voltage,V 125
Steepness,mA/V 2,1-3,5
Reverse grid current,uA 0,1
Microphnic noise,mV 130
Socket type flexible













Russian tubes history

 UM-2  10W poweramplifier for series: R-105D-M

Soviet type UM-2 is a VHF RF amplifier used to amplify the RF output of the R-105M, R-108M or R-109 family of manpack VHF FM sets. It was issued in the late 1950s and used contemporary developments: valved RF amplifier (type 6P23P) and transistor HT invertor unit. The accumulators are fitted in a separate compartment at the rear of the unit. It is built up as backpack in the same housing as for example R 105M (bakelite), only deeper  in  dimensions.

Frequency range:
20.0... 46.1 MHz, = 10 W,  divided in three ranges.
46.0... 61.0 MHz, = 7 W, one range
Technical data:
Mass + weights:
L/b/h: 365 x 140 x 310 mm, 15 kg without batteries.
Transmitting power
10 / 7 Watts.
Rated voltage
8.8 - 10.4 V.
Power input
4.8 - 5.5 A
Power supply
8 batteries KN 14 in series, in the rear part of the set.
Actual working time
18 hrs with a transmission/receiving relation 1:3,
Feed crate
HF amplifier
HF adapter
HF cable
NF cable
Dummy load
Tool kit


Wiring chema UM-UM2 and UM3


bulletFrequency coverage 20-60MHz in four ranges.
bulletRF output about 10 Watt
bulletSuitable for FM R/T only.
bulletSelf contained unit with same shape and size of R-105/108/109.
bulletPowered by eight 1.2V 14Ah NiCad batteries. It is better to have 2x 6volts 7Ah .It must change the filament resistor from ca 4 ohm to 8,5ohm.This 2 batteries have a nice place into the compartment.
bulletManpack harness

Some of the small control meter could "be hanging". It is possible to take out the complet unit this way:Take radio out,then desolder all 3 wires on the back of the meter.Loosen the 3 screws on is possible to move all backwards out. It is very good taightened.Principle:The end cover with 3 screws press a "o" rubber-ring out to the corner of the iron-cylinder, lock and seel it.This way you may change the front glass if it is broaken.                              



                                                                                         This site was last updated 10/25/15   Home

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