Torn. Fu. d 2
Portable VHF tranceiver
Tornister - Funkgerät

Torn.Fu.d2 with front cover mounted.

This Torn.Fu.d2 is produced in 1936 with the latest tube technology available.

General info from the handbook:

This portable transceiver Torn.Fu.d2 is a VHF 2 way communications device with
modes A1 “ Telegrafie tonlos” and A3 “Telefonie” operated in the frequency range 33.8 to 38 MHz.
Communication range in A3 mode is approximately 3 km and 10 in A1 mode.

The Torn.Fu.d2 can be operated from a field telephone via a 1 to 2 km long field line.

Transmitter has 3 tubes and a output power of 1 watt.
Receiver has 6 tubes with a IF on 2.1 MHz.

LA8AK’s block diagram.

Torn. Fu. d2

Portable VHF tranceiver
Frequency range: 33.8 - 38.0 MHz
Tx output Power: 1 Watt
IF = 2.1 MHz.
Power: 2.0V - , 130V -
Measures: H = 390 mm, W = 340 mm, D = 190 mm
Weight: 17 kg

Front panel with all electronics removed.

Inside front panel. Very nice work with the cables.

Each of the modules can easily be removed from the frame.


Here is the receiver module with the frequency tuning mechanism in front.

The rear of RX module.
Bottom left is the tuning capacitor.
Top left is the oscillator cavity.
Bottom right is the oscillator tube RV2P800.

Left view of the receiver module.
From left: Mixer tube RV2P800 and RF input tube RV2P800.
Bottom left is the MF output terminals form the mixer.

Here is the RX tuning dial. Bras bearings is used on all axels.



Frequency Generator in transmitter and receiver in Torn.Fu.d2

This is an absolutely fantastic component.
This unit determines the frequency of the transmitter and receiver in Torn.Fu.d2.
This is the finest LC circuit I've seen.
This unit contains the entire oscillating circuit of the oscillator.

Two SKF ball bearings makes the mechanical accuracy absolutely prefect.

Here are all the parts. The cylinder is made of silver plated metal.
All the brown parts are made of copper.

Here is the fantastic fine coil.

The brown plate to the left is connected to the top of the coil.
Plate to the right rotates and forms a variable capacitor toward the plate to the left.
This being a resonant circuit with super high Q.

Here we see both the coil and capacitor in the oscillating circuit.

Closeup of the capacitor rotor. It is connected to GND.

The bearings are made of SKF and is very accurate.