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Stasi
Minature modular spy receiver
- this page is a stub
FLE, also known as Projekt 32310, is a miniature modular HF
spy receiver (German: Kleinstempfänger),
introduced in 1980 by Department HV A of the
repressive intelligence service of the former DDR (East Germany)
— Ministerium für Staatssicherheit (MfS),
better known as the Stasi.
It covers 3-19.5 MHz and was issued
as a stand-alone receiver for Base-to-Agent communication.
It was also supplied with the WSA-1 spy transmitter,
as part of communication
system 32210.
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The image below provides a quick overview of the controls and connections
of the FLE receiver. The device is shown here with plug-in unit 1 (3 MHz).
The plug-in should ba attached to the two coaxial connectors at the left side
of the receivers. Antenna and ground wrires should be connected to the screw
terminals at the left side of the plug-in. The earphone must be connected
at the right end of the front panel. The device is powered by a a 9V battery
that is attached at the right.
Als controls are at the front panel. At the centre of the front panel are
three red circular windows, behind each of which is a miniature red 7-segment
display, similar to the ones that were used in the early digital watches of
the 1970s. Together, the displays form a 3-digit number that specifies
the offset (in kHz) from the base frequency printed on the plug-in's ID plate.
To alter the offset, place the MODE selector (3-f-1) in the (f) position.
This enables the display (but disables the receiver).
To receive a radio station, place the MODE selector in the 3 (AM) or 1 (CW)
position. This disables the display, although tuning is still allowed
(albeit without readout).
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| • | 3 | A3, AM, Phone |
| • | f | Frequency setting (display) |
| • | 1 | A1, CW, Morse |
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- Determine the desired receive frequency
- Select the correct plug-in and connect it to the FLE body
- Each plug-in covers 1 MHz (e.g.: 5.7 — 6.7 MHz)
- Calculate the offset from the frequency on the label
e.g. Frequency = 6453 kHz
Use plug-in (2) 5.7 MHz (= 5700 kHz)
Offset = 6453 - 5700 = 753 - Connect the antenna
- Connect the earphone
- Connect a 9V battery (the device should work immediately)
- Set MODE-selector to centre position (f)
- Adjust the tuning knob so that the calculated offset is in the display
- Select the desired modulation type (3 = A3, AM), (1 = A1, CW)
- Adjust the volume control
- Adjust Antenna tuning for maximum noise
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When the battery voltage is too low, the decimal dot of the three
displays will light up.
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| # | From | To | |
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| 1 | 3.0 MHz | 4.0 MHz | |
| 2 | 5.7 MHz | 6.7 MHz | |
| 3 | 6.8 MHz | 7.8 MHz | |
| 4 | 7.9 MHz | 8.9 MHz | |
| 5 | 9.1 MHz | 10.1 MHz | |
| 6 | 11.4 MHz | 12.4 MHz | |
| 7 | 13.0 MHz | 14.0 MHz | |
| 8 | 15.5 MHz | 16.5 MHz | |
| 9 | 16.9 MHz | 17.9 MHz | |
| 10 | 18.5 MHz | 19.5 MHz | |
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When the receiver was supplied for stand-alone use, it came in a yellow
rubber-like foam container that measures 107 × 215 × 215 mm.
In this container, each part has its own dedicated space.
The compartments for the 10 plug-in units are numbered (1-10).
The serial number of the receiver is printed on the outside of the
container.
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The first six plugs-ins (1-6) measure 20 × 45 × 67 mm and cover the frequency
range 3-12.4 MHz. These are the large plug-ins. Note each plug-ins convers
a 1 MHz range only, which means there are gaps between the plug-ins.
When the FLE receiver was used with the WSA-1 spy radio station, these
were the only six plug-ins that were supplied.
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The higher frequency plugs-ins measure just 20 × 24 × 60 mm and cover the
frequency range 13-19.5 MHz. Like with the large plug-ins, each plug-in
covers just 1 MHz, which means tat the frequency coverage is not continuous.
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The FLE receiver was supplied with a standard dynamic earphone, which
terminates in a 2.5 mm jack plug. The earpiece must be connected to the
2.5 mm jack socket at the right end of the front panel of the receiver.
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Two short pieces of wire were supplied on a plastic carrier.
the long part should be used as the antenna, and must be connected to the
antenna terminal of the plug-in.
The short wire can be used to connect the ground terminal of the plug-in
to ground.
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A battery extension cable was supplied for use of the receiver with detached
battery. This is particularly usefull when powering the receiver from two
4.5V flat-pack batteries.
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By default, the receiver is powered by a standard 9V black battery.
As an alternative, it is also possible to power it from two standard 4.5V
flat-pack batteries. In that case, the adapter shown in the image on the
right must be used to connect the batteries.
When using the adapter, the battery extension cable (above) should be
used to connect it to the receiver.
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Device Miniature modular HF receiver Purpose Agent communication Model FLE Project 32310 Manufacturer OTS/SF Users HV A, OTS/E, NVA Country East-Germany (DDR) Year 1980 [3] Part of Stand alone, WSA-1 (32210) Frequency 3 — 19.5 MHz (in 1 MHz steps) Plug-ins 10 ➤ More Range ≤ 5000 km Power 9V block battery (external) Dimensions Complete kit: 107 × 215 × 215 mm (HWD) Weight 1910 g
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- Receiver 32310 (FLE)
- 10 plug-in units
- Earphone
- 9V battery extension cable
- Adapter for 2 × 4.5V battery
- Wire antenna
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Dimensions 20 × 154 × 75 mm(HWD) Weight 300 g
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Plug-in 1, 2, 3, 4, 5, 6 Dimensions 20 × 45 × 67 mm (HWD) Weight 84 g
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Plug-in 7, 8, 9, 10 Dimensions 20 × 24 × 60 mm (HWD) Weight 48 g
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138 Bundesamt für Verfassungsschutz, Germany 341 ? 360 ? 424 Crypto Museum, Netherlands
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- Detlev Vreisleben, Information about 32310 (FLE)
Crypto Museum, 6 July 2026.
- Louis Meulstee, FLE
Wireless for the Warrior Vol. 4, Supplement, Chapter 40.
Version 1.00, November 2015.
- Dr. Schiffel (Major), Jahresarbeitsplan 1982, Teil I, Zielstellung
MfS, OTS/33, 26 August 1981. Page 12.
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© Crypto Museum. Created: Tuesday 07 July 2026. Last changed: Friday, 10 July 2026 - 19:10 CET.
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