Feldfu. b

Feldfu. b (Feldfunksprecher b)
This is a portable transceiver unit, was manufactured by the Staru firm beginning from 1941. This family of transceivers included the B, B1, B2, C, D, F and H . The major difference between all of these models is the frequency range in which they operate. This B model operates in the 90.57 to 109.45 MHz range. With the Feldfu. b case being constructed from bakelite, this transceiver is very light weight relative to other radios of that time. General Information: Feldfu. A1, B, C, and F are portable, compact, 2-way radiotelephones. They have a common tuning element for transmitting and receiving. Two sets to communicate with each other must be tuned to the same frequency. Obstacles - even men in the line of transmission - seriously affect communication. Feldfu. a1 has a sheet-iron container with a carrying handle, straps for carrying on the shoulders, and removable bags for accessories. The container holds the transmitter-receiver, one hand-microphone, one battery (2 B 19) and one 90-volt plate battery. The accessories bag holds one pair of headphones, one throat microphone, two short rod antennas (one spare) each consisting of two rods approximately 12" long which fit into each other . The antenna bag holds one long rod antenna consisting of 3 rods each approximately 24" long which plug into each other, two guy lines and two tent pins. Feldfu. B and C have containers with special fittings so that the equipment can be carried on the back. Both types B and C are easily identifiable even in the dark, the B type having embossed red marks on top of the container, while type C has only one mark (green) in the same place. The container holds the transmitter-receiver, rod antenna, (in two sections) 32" long (marked red) for type B and 28" long (marked green) for type C, one battery 2.4 NC 2B, one operating attachment, one remote cable (type B), one laryngaphone (type C) and one pack pad. The Feldfu. B is described as having a removable harness by which it can be carried on the back of the operator. Method of operation is push-to-talk. After communication has been established two-way traffic can be maintained by pressing the microphone switch to transmit and releasing it to receive. A fresh battery will operate the set for up to 13 hours at normal temperature. The frequency range of this set is higher than that of any other tactical sets. The Feldfunksprecher b uses a storage battery for primary power, necessitating the use of charging equipment (HLS a)

Specifications

FREQUENCY RANGE:	90.57 to 109.45 MHz (fixed settings 211-240).

NUMBER OF CRYSTALS:	None

PRESET FREQUENCIES:	30 for type b.

ANTENNA:	Rod used for both transmitting and receiving, varying in length from 2 feet in type a1 to 6 feet in type f.

TUNING:	(MO OR CRYSTAL) Mo.

SENSITIVITY:

SELECTIVITY:

POWER SOURCE:	Batteries for type a1, 1-2B 19, 1-90 v plate. For types b and c, 2.4 NC 28, WG 2.4a

SIMILAR SETS	Feldfu. a1, b1, b2, c, d, f, h

POWER OUTPUT:	(Watts) Types a1 and f, 0.15; types b and c, 1.2.

TUBES (TYPE and NUMBER):	1 x RV 2,4 P 700, used as R-F amplifier and monitor 1 x RL 2,4 P 2 used as A-F amplifier and modulator 1 x RL 2,4 T 1 used as super-regenerative detector and R-F oscillator.

USE:	Walkie-talkie used for tactical communication between battalions and companies. It may be operated while stationary or on the move. It is thought that the Feldfu.f is used by armored reconnaissance units.

TYPE OF SIGNAL:	Voice only.

RANGE: (MILES)	Quoted are 0.8 for types a1 and f, and from 0.5 to 1.0 mile for types b and c.

TO COMMUNICATE WITH:	It is though that type f will communicate with Ukw. E. e and 10 W. S. c

TO REPLACE IN PART:

TRANSPORTATION:	One man pack, or in vehicular.

This is my recently acquired Feldfu. b set, complete with a flex antenna and a HLS.a battery charger The charger has the "Ark" inscription on it which means it can function under Arctic conditions.

Here the battery charger hand crank is installed.

The portable units as seen from above. Notice the leather straps with which to secure the units to a special back pack. The carrying straps are also original.

The flex antenna is original to this set and still has all of the flexibility after 63 years.

Remote control cable allowed the radio operator to control the volume and tuning without removing the radio from his back.

Equipment model plate showing serial number and year of manufacture. On/Off switch at the bottom and the Wafflen-Amt 801 stamp..

Voltage indicator.

Plugs for two sets of headphones and one microphone.

This is the detachable portion of the control panel which includes the volume control and frequency tuning.

Preset frequency control knob. Communication frequencies were negotiated previously, and were set on the Feldfu. b after which the cover was closed, and the radio operator usually had no need to open it while on assignment.