Ukw. E. e (Ultrakurzwellen Empfänger e)
 

The Ukw. E. e is a radio receiver used mostly in tanks and in other armored vehicles. It operates in the frequency range of 27.2-33.3 MHz, or roughly the 10 meter band.

This is a heterodyne receiver and a Telefunken product. Receiver chassis is contained in a strong case, and has a cover that clips to the front panel. There are no lugs or projections since mounting hardware is built into tanks. On top of the case are a pair of brass stripes for grounding purposes. Two cables provide the necessary connections between transmitter and receiver - one for side tone, and the other for the antenna.

 
Specifications
 
FREQUENCY RANGE:
(Mo) 27.2 - 33.3 MHz. Dial graduation of the Ukw. E. e is in 50 kc intervals
NUMBER OF CRYSTALS:
PRESET FREQUENCIES:
2
ANTENNA:
6.5 foot rod (2 meter)
TUNING:(MO OR CRYSTAL)
MO or CRYSTAL
SENSITIVITY:
SELECTIVITY:
POWER SOURCE:
12-volt vehicular storage battery through dynamotor (Umformer) German type E.U. a2. Current drain from 12 volt battery 2.3 Amperes. Power requirements, Plates: 130 volts, 27 mA; Filaments: 12.6 volts, 1.4 Amperes; Dial Lamp 12 volts, 0.14 Amperes
SIMILAR SETS :
Ukw. E. c, Ukw. E. d1, Ukw. E. f, also SCR-508(FM), SCR-608(FM).
POWER OUTPUT:(WATTS)
TUBES (TYPE and NUMBER):
7, all RV 12 P4000 , used as R-F amplifier, mixer, H-F oscillator, 1st I-F amplifier, 2nd I-F amplifier, detector and A-F amplifier. I-F frequency is 3 MHz; H-F oscillator frequency is 3 MHz below signal frequency.
USE:
These receivers are used in armored vehicles, in tanks for communication between tank company and tank battalion headquarters, and in stationary installations for short-range communication with marine stations. They can be used in nets with American amplitude-modulated radio sets within the frequency and distance range.
TYPE OF SIGNAL:
Tone and voice, amplitude modulated
RANGE: (MILES)
TO COMMUNICATE WITH:
Other tanks or armored vehicles.
TO REPLACE IN PART:
 
The Yellow Stripe Modification
 

Translation from Die deutschen Funknachrichtenanlagen bis 1945 - Band 3 "Funk- und Bordsprechanlagen in Panzerfahrzeugen" by Hans-Joachin Ellissen

The experiences of the tanks in the begining of the Second World War showed that intercommunications between the commander, driver, radio operator were required. For this purpose the intercom system "Z" was introduced, which used the LF stage of the Ukw.E.e receiver as an amplifier, and the 10W.S.c transmitter provided feed voltage to the three throat micropones. Both original schematics of the receiver and transmitter had to be modified to compensate for this lack of amplifier in the intercom box. This modification was made on the date of March 1st, 1940. The manufacturers indicated this "modification" by placing a vertical yellow stripe to the left of the frequency scale, on both the receiver and transmitter. All original receivers and transmitters, were replaced by the "yellow-stripe" devices in latter intercom system implementations.

Other than the notice about the "modification" of March 1st, 1940, there is no other information about this topic. The modified Yellow-Stripe schematic is shown against the original schematic in the military manual number D 988/2:

Ukw.E.e: The side-tone connector "zum Sender" is coupled with the headphone output and with the R-C combination (500 kOhm, 10nF) and connected to the control grid circuit of the low frequency stage. (If the "zum Sender" connector is unplugged, this circuit is shorted).

10W.S.c: Here the schematic of the modulation stage is modified.

1. The low-resistance side-tone output of the transformer 58(Tn) and 21(Tg tönend) are no longer connected. A high-Ohm output over a 100kOhm resistance was created to the side-tone circuit, and it was connected onto the secondary winding of the microphone input transformer 57. That way everyone can listen together over the receiver low frequency amplifier, what is delivered from the microphone input of the transmitter. With the setting "Tg tönend" of the 10W.S.c where the modulation stage is switched as a 800 Hz generator, when the key is activated the side-tone voltage is taken from the kathode of the RV12P4000 tube.

2. In the operating modes of "Tn", "Empfang" and "Tg tönend" the microphone connectors are provided feeding voltages (previously only with the "Tn" setting). This enables the powering of the switched-on microphone of the tank commander, radio operator, and driver for intercom conversations (everyone can hear the output of the receiver) with all operating modes of the tansmitter. The operation of the "Yellow Stripe" devices with the latter special intercom box amplifiers was identical with the Fu5 devices without the modifiied schematics.
 
Stug IIIg Fu 5 + 2 diagram (version after April 1944)

 

 
Command Stug IIIg Fu 8 Fu 5 diagram (version after April 1944)

 

 
Stug IIIg Fu 5 + 2 power distribution diagram
 
 

THE PREMIER MANUFACTURER

OF PANZER RADIO EQUIPMENT
 

 
Front view of the receiver. The paint is in pristine condition

 

 
The manufacturing designation. Waffen Amt "B"

 

 
Controls

 

 
Headphone sockets.

 

 
Frequency scale.

 

 
Antenna connectors and connection to transmitter.

 

 
The first problem I saw when I opened it was a broken resistor. Not completely broken, but cap disconnected from the body. I used heat and pressure to reconnect them. Resistance measured correctly after that treatment.

 

 
Then a capacitor was broken off by the previous owner not opening case carefully enough. I substituted an equivalent Japanese capacitor and made it look close to original.

 

 
I substituted an equivalent Japanese capacitor and made it look close to original. I also painted it with the part number from the manual.

 

 
All of the vacuum tubes showed perfect health, as if this receiver has never been used. Just like the receiver, the vacuum tubes all are dated from 1941.

 

 
 

 

 
 

 

 
 

 

 
 

 

 

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