E.P.2
Direction Finding receiver

(EP2 Peilempfänger)

This receiver was used together with the HE1 monitoring receiver to find a spy transmitter operating on a particular frequency. Once the frequency was established by listening through the Fu. H. E. 1, the EP2 would be used in a direction-finding mode to find the compass direction of the transmission. Both the Fu. H. E. 1 and the EP2 had identical frequency scales and ranges. The Fu. H. E. 1 lacks the direction finding hardware of the EP2. These two receivers are often seen in Luftwaffe radio van configurations that monitored entire districts for spy transmitters.

Set packaged in 2 portable containers: receiver pack, accessories pack, container with tripod, and container with antenna. DF greatly simplified by use of rotatable cross-loop antenna - one loop used for direction finding and other at right angles for determining "sense" of transmitting station. This can be accomplished throwing a switch. When taking bearing on a CW transmitter, the performance of the receiver in terms of minimum width for effective field strength is approximately 0.5 mV/meter for 0.50 minimum width in all frequency ranges. Function of the "stand-by" antenna is to reduce azimuth errors caused by local reflection echoes.

For direction finding, switch over to "Ein" (on); adjust low voltage control to 4 V (red mark on meter); tune in to required station; adjust until suitable signal strength is obtained; swing antenna loop round and note as nearly as possible position where signal is minimum. If minimum is not clear and sharp, regulate by rotating antenna alternately one way and then the other, at the same time, adjusting DF control knob "Regler für Peilen"; When minimum position is found, read off bearing indicated on the scale.

The internal metal components are constructed from aluminum, making this unit surprisingly light-weight.

 

 
Specifications
 
FREQUENCY RANGE:
.075 to 3.333 MHz in 5 bands. Band I: 69-150 KHz; Band II: 150-343 KHz; Band III 330-775 KHz; Band IV: 720-1680 KHz; Band V: 1580-3620 KHz.

NUMBER OF CRYSTALS:
None

PRESET FREQUENCIES:
None

ANTENNA:
3 Antennas: -- 2 rotating loop aerials 1 meter square, insulated copper tubing, set at right angles to each other, one for DF and one for "sense" determination; 1 "stand-by" or auxiliary aerial, vertical rod 1 meter long or horizontal wire 3 meters long.

TUNING:
(MO OR CRYSTAL) Mo.

SENSITIVITY:
Maximum (Output of 4v into 4000 ohm resistance for 2/10 mV from A1 and 4/30 mV form A2 (transmitters with note of 1000 Hz))

SELECTIVITY:
High

POWER SOURCE:
Edison storage battery 4.8 NC 10 for filament voltage to tubes; 3 30-v or 1 90-v battery for plate (anode) voltage.

SIMILAR SETS
See Telefunken (1938) catalog-Type IIIN

POWER OUTPUT:
Consumption low voltage input 0.45 amp; Plate current 18 mA.

TUBES (TYPE and NUMBER):
6 tubes of 2 types -- 3 x RE 084K (1 LE amplifier, 1 detector, 1 heterodyne) and 3 x RES 094 (1 HF, 1 mixer, 1 IF). The anodes of all tubes lie in a common circuit carrying voltage of 100

USE:
For DF and "sense" determination; to receive signals from and to take bearings on CW transmitters within the limits of the wave band of .075 to 3.333 MHz.

TYPE OF SIGNAL:
Tone

RANGE: (MILES)
Miles

TO COMMUNICATE WITH:
DF on transmitters

TO REPLACE IN PART:  
   
TRANSPORTATION:
Portable - packed in 4 containers - can be hand carried. Stationary - can be installed in tent, hut or vehicle.








 

 

 

 

 

 

 

 

 

A version of the EP2 called the T3PLLä38 used in u-boats for radio direction finding. This allowed the u-boat to triangulate the radio signal of an enemy ship and get its position. It also assisted with navigation.

 

 

PRA1 (Peilrahmenantenne 1) rotating frame antenna control for the direction finders.

 

 

Fu. H.E. 1 being used in a Luftwaffe Radio Van with the Peilantrieb mit Peilskala und Drehrohr, and the EP2 to the right of the photo.

 

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