AIR FORCE D/F RECEIVERS

LAST MODIFIED : November 12th, 1999

BG 42

Direction finding board set. First RDF designed for fighters purpose. Manufacturer Allocchio Bacchini
Year : 1942
Frequency Range : 275 - 475 kHz in 2 presettable channels
Facilities : CW and RT
Receiver Circuit (Valves) : Superheterodyne with IF=650 kHz . 7 tubes E1R + 1 EB4
Composition : -Receiver = rBG 42 -Control box = qBG 42 -Indicator = iBG 42 -Antenna = tBG 42. Loop (Around 20 cm diameter)
Power supply : Same of the receiving part of the radio station. Usually B 30

E 393N

Direction finding set. Ground portable. Manufacturer Telefunken but also built in Italy from OLAP and Siemens. Similar to E404 but specially designed to used in portable conditions. The complete set were contained in wooden chests and were part of all Receiving truck sets. Superheterodyne Receiver
Year : 1930
Frequency Range : 75 - 3333 kHz in 5 bands
Facilities : CW and RT
Composition :
Receiver chest, Accessories and batteries chest, 2 Bags containing double frame antenna, Vertical auxiliary antenna and cables
Receiver Valves : 6, 3 type RES 094 and 3 type RES 084K
Power supply : Dry batteries (4 or 6 and 120 Vdc)

E 397N

Receiver. Direction finding

E 404N

Direction finding set. Ground or vehicular. Manufacturer Telefunken but also built in Italy from OLAP and Siemens. Standard ground RDF not only for Air Force but also for Army and Navy. Superheterodyne Receiver
Year : 1930
Frequency Range : 75 - 3333 kHz in 5 bands
Facilities : CW and RT
Composition :
Receiver, Double frame antenna, Indication plate, Vertical auxiliary antenna
Receiver Valves : 6, 3 type RES 094 and 3 type RES 084K
Power supply : Dry batteries ( 6 and 120 Vdc)

P 57N

Receiver. Ground Direction finding set for special purpose. Manufacturer Telefunken. Superheterodyne circuit. Only SW.
Year : 1938
Frequency Range : 100 - 15 m in 3 bands
Facilities : CW and RT
Composition :
Receiver, Frame antenna, PSU

P 63N

Receiver. Direction finding. Built in Italy under Telefunken licence. Main Italian munufacturers : OLAP, Allocchio Bacchini, SAFAR. Has been the first board RDF used on Italian aeroplanes. Mainly used on multiengine aircrafts.
Year : 1935
Frequency Range : 165 - 1000 kHz in 2 bands
Facilities : CW and RT
Composition :
Receiver : E397
Remote control : PB49N
Loop antenna : PR50N
Antenna controll and coarse indicator : PA51N

rBG 42

Receiver. Direction finding. Part of the RDF type BG 42. Manufacturer Allocchio Bacchini
Year : 1942
Frequency Range : 275 - 475 kHz in 2 presettable channels
Facilities : CW and RT
Receiver Circuit (Valves) : Superheterodyne with IF=650 kHz . 7 tubes E1R + 1 EB4
Aerial : Loop (Around 20 cm diameter)
Power supply : 230 and 24 Vdc

RGM 37

Direction finding set. First original italian board RDF. Munufacturer SAFAR also if it possible find some part built from other manufacturer. Route indication : Visual or acustic (E/T system) Used on multiengine aircrafts.
Year : 1940
Frequency Range : 172 - 1100 kHz in 2 bands
Facilities : CW and RT
Composition :
Receiver, Loop antenna, Control box, Route indicators, PSU
Receiver Valves : 4x EF9, EB4, EK2, EBC3, EL2
Power supply : 24 V input dynamotor

SPEZ 144N

Direction finding set. Ground or vehicular. Manufacturer Telefunken.
Year : 1930
Frequency Range : ???
Facilities : CW and RT
Composition :
Receiver, Loop antenna, Indication plate, Auxiliary antenna
Receiver Valves : 8 type RE144
Power supply : Dry batteries ( 4 and 50 Vdc)

SPEZ 1144N

Direction finding set. Ground. Same as SPEZ 144N with small improvements to make easy the operations

930/A

Ground direction finding set. Designed to replace the obsolete Germans SPEZ 144 and SPEZ 1144. Manufacturer SAFAR. Supeheterodyne receiver with IF to 175 kHz.