ARMY RADIO STATION "R" SERIES
LAST MODIFIED : November 11th, 1999
R 2
Radio station. Low power ground station for communications inside the small units in the range
of 10 Km.
Year : 1932
Frequency Range : 1,463 - 2,055 kHz
Facilities : CW only
Receiver Circuit (Valves) : Detector (RRAF) + 2 AF (RRBF)
Transmitter (Valves): MO (TR1-2)
RF Output : 0.8 W
Aerial : Loop
Power supply : Dry batteries
R 2-3
Radio station. Low power ground station for communications among the small units in the range
of 25 Km.
Year : 1937
Frequency Range : 1,463 - 2,500 kHz in two switched band
Facilities : CW only
Receiver Circuit (Valves) : Detector (RRAF) + 2 AF (RRBF)
Transmitter (Valves): MO (TR3)
RF Output : 3 W
Aerial : Loop
Power supply : Dry batteries
Remarks : Built like replacement for the set R 2 and the R 3.
There is a model named R 2-3 Mod.1939 made from Allocchio Bacchini and also a
model Mod.1940 built from Ducati with a different front panel and frequency indication in kHz.
R 2-3 Model 40 of Ducati production. Dial indication in kHz .
R 3
Radio station. Low power ground station for communications among the small units in the range of 25 Km.
Year : 1932
Frequency Range : 2,000 - 2,500 kHz
Facilities : CW only
Receiver Circuit (Valves) : Detector (RRAF) + 2 AF (RRBF)
Transmitter (Valves): MO (TR3)
RF Output : 3 W
Aerial : Loop
Power supply : Dry batteries
R 4
Radio station. Medium power ground station for communications among command in the range
of 60 - 120 Km.
Year : 1932
Frequency Range : 214 - 880 kHz in two bands
There is a model named R 4 Mod.32 working in the same frequency but in 3 bands.
Facilities : CW and RT
Receiver Circuit (Valves) : Detector (RRAF) + 2 AF (RRBF)
Transmitter (Valves): MO (TR4)
RF Output : 7 W
Aerial : Inverted L 9+25 m
Power supply : Dry batteries
R 4 set - .
R 4A
Radio station. Medium power station for communications with aeroplanes, but also used
like fixed installation. Range 80 Km in RT and 120 Km in CW.
Year : 1933
Frequency Range : 750 - 1,500 kHz
Facilities : CW and RT
Receiver Circuit : Superheterodyne 5 valves (RSAF, RRCF, RSAF, RRAF,RRBF)
Transmitter circuit : MO (TR1-2) PA (RTP-4) Modulator (TR-3)
RF Output : 7 W
Aerial : Inverted L 9+30 m
Power supply : Dry batteries
There is also a model Mod.1935 with same appareance and minor electrical difference.
R 4D
Radio station. Medium power ground station used from coast surveillance units and internal
defence
Range 30 Km in RT and 60 Km in CW.
Frequency Range : 1,300 - 4,285 kHz
Facilities : CW and RT
Receiver Circuit : Superheterodyne 8 valves (RSAF, RRCF, 2xRSAF, RRAF, 3xTR-2)
Transmitter circuit and valves : MO (TR1-2) PA (RTP-4) Modulator (TR-3)
RF Output : 5 W
Aerial : Dipole
Power supply : 12 V storage battery and dynamotor
R 5
Radio station. Very high power station used for HQ communications. Carried by a special truck and
built in many types using different parts. Separate receiver and transmitter.
Range 250 Km in RT and 500 Km in CW.
Frequency range Mod.33 : 158 - 476 kHz
Frequency Range Mod.36 : 158 - 476 kHz
Frequency Range Mod.40 : 165 - 1300 kHz
Facilities : CW and RT
Receivers Type:
Mod.33 = Marconi R198A, 5 valves, f.range 100-1500 kHz in 4 bands
Mod.36 and 40 = GEC Superheterodyne 6 valves (6D6, 6A7, 6D6, 75, 6D6, 42)
Transmitters Type :
Mod.33 - Marconi - MO (MT12A), PA (2xMT12A), Mod. (LS5)
Mod.36 - GEC - MO (T250), PA (2xT250) Mod. (47)
Mod.40 - MO (RT-5) PA (2x RT-5) Mod. (47)
RF Output : 250 W
Aerial : Inverted L
Power supply : Models built before 1935 by storage batteries and Dynamotor. Later
model supplied by an engine driven generator.
R 6
Radio station. Vehicular high power station used from Army Commands for long distance communications.
Built in many types using different parts and working in diferent bands.
Range 400 Km in RT and 800 Km in CW but in SW the distance could be up to 5000 Km
Frequency Range LW : 100 - 600 kHz
SW : 3,200 - 20,000 kHz
Facilities : CW, CW automatic (Creed) and RT
Receiver Circuit : Superheterodyne (many types)
Transmitter circuit and valves : MO-PA-Modulator
RF Output : 800 W in CW and 400 W in RT
Aerial : Inverted L and dipole
Power supply : By mains (220 Vca) or suitable engine driven generator
R 6-OC 1939
Radio station. Vehicular high power station used from Army and Corps Commands for long distance communications.
Separate receiver and transmitter.
Year : 1939
Range 400 - 5000 Km
Frequency Range : 3,200 - 20,000 kHz
Facilities : CW, CW automatic (Creed) and RT
Receiver Circuit : Superheterodyne (many types)
Transmitter circuit and valves : MO-PA-Modulator
RF Output : 1000 W in CW and 500 W in RT
Aerial : 100 m Long wire with ATU
Power supply : By mains (220 Vca) or 7 kW engine driven generator
R 6-OM 1939
Radio station. Vehicular high power station used from Army and Corps Commands for long distance communications.
Separate receiver and transmitter. Manufacturer FACE Standard.
Year : 1939
Range 400 - 5000 Km
Frequency Range : 100 - 600 kHz
Facilities : CW, MCW, CW automatic (Creed) and RT
Receiver Circuit : Superheterodyne 7 tubes (EF8, ECH3, EF9, 2xEBC3, EL3, 80.
Double IF channel to 60 and 470 kHz.
Receiver frequency : 74 kHz to 21 MHz in 8 bands
Transmitter circuit and valves : MO-PA-Modulator using 7 valves with two 5C500 in parallel on PA
RF Output : 500 W to 3000 W
Aerial : 100 m Long wire with ATU
Power supply : By mains (220 Vca) or 11 kW engine driven generator
