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AU-018 →
Universal UHF/FM bug · transmitter
AU-015 is a miniature crystal-controlled narrowband FM
covert listening device (bug),
developed in the early to mid-1990s by an unknown manufacturer in Japan. 1
It operates in the UHF
band on one of two predetermined spot frequencies (marked as A or B)
near 400 MHz.
For reception of the bug, the matching
AU-018 2-channel receiver was recommended.
The range was ~ 300 metres.
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The device is housed in a black brass enclosure that measures
68 × 27 × 14 mm and weights 62 grams, batteries included.
It is powered by two 1.5V miniature MN 9100 batteries
and has a built-in electret microphone.
A removable 176 mm long whip acts a ¼λ antenna for 400 MHz.
A letter on the device reveals the frequency:
(A) 398.600 MHz or (B) 399.450 MHz.
The matching AU-018 receiver is suitable for both frequencies
and has an A/B switch at the bottom. It was used with a helical or
a ¼λ whip antenna. Under good conditions a range of 300 m should
be realistic.
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The device was still for sale in December 2022 for a list price of
US$ 485. It was usually supplied in a black storage case, complete
with the matching AU-018 receiver
— which added another US$ 485 to the bill [1].
Devices like this were typically sold by specialised spy shops and
at airports. To circumvent the law — the use of covert listening devices
is illegal in most countries — they were commonly marked for export only.
In some countries even the possession of a bug is illegal.
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This is not 100% certain but very likely, judging from the build style
of the transmitter and the accompanying AU-018 receiver, as well
as from the selected components.
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Device Covert listening device (bug) Type Crystal-controlled UHF transmitter Purpose Room overhearing (covert listening device) Model AU-015 Manufacturer Unknown Band UHF Modulation Narrowband FM (NFM) Channels 1 Frequency A: 398.600 MHz, B: 399.450 MHz 1 Range 300 metres to 1 km Power 3V (2 x 1.5V size N) Battery 1 × CR 1200 (3V) or 2 × LR-1 (1.5V size N) Life 8 days Dimensions 66 × 27 × 14 mm Weight 46 grams (62 grams with batteries)
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A later version was available in three different frequencies: A,B and C.
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© Crypto Museum. Created: Wednesday 21 December 2022. Last changed: Tuesday, 14 March 2023 - 15:25 CET.
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