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Miniature communications receiver
- wanted item
L662 is a miniaturised LW/MW/SW communications receiver for the 40
kHz to 30 MHz range, introduced in 1967 by MEL Equipment Co 1 in Crawley (Sussex, UK).
The receiver was developed for use by the Navy, the Army and for intelligence
purposes, but was also commercially sold.
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The device is housed in a die-cast aluminium enclosure that measures
153 × 83 × 38 mm — slightly larger than a hand — and weights less than one
kilogram, mercury batteries included.
The transistorised design consist of the first generation of integrated
circuits (ICs), along with miniaturised circuits built on film
substrates. At the center of the unit is a digital readout that
shows the currently selected frequency.
The MHz digit selects the appropriate harmonic
from an internal 1 MHz crystal oscillator, whilst the 100 kHz digit selects
one of 10 additional crystals.
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Fine tuning is done with the built-in Beat Frequency Oscillator (BFO),
which can also be used to calibrate the receiver. The device is powered by two
TR-134 mercury batteries — made by Mallory — that are held in a removable unit
at the rear end. At the left side are two banana sockets for connection of
a antenna and ground wires. A bracket with a built-in
BALUN can be installed in these sockets, allowing the use of the supplied
telescopic antenna or an external one (via coax).
The L662 is suitable for the reception of AM, CW
and, by using the BFO, Single Side Band (SSB) signals. Demodulated audio
is delivered to a high-impedance hearing aid style earpiece that is connected
at the front. The device was first introduced to the public in Wireless World
of June 1967 as a pocket receiver [2] .
Although its price is unknown, it was probably too expensive for
the average hobbyist, given the fact that LEMO connectors are used for
earpiece, antenna and AGC.
It is therefore more likely that the device was actually intended for
professional use.
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At the time (1967) MEL was a subsidary of Philips.
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Device Miniature communications receiver Model L662 Manufacturer MEL Country UK Customers CIA, MI5, MI6 Power 2 × Mallory TR-134 mercury battery Duration 25 hours of contunuous operation Antenna Telescopic (supplied) or external (via LEMO socket) Dimensions 153 × 83 × 38 mm Weight 907 g (batteries included)
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LW 40 - 300 kHz MW 300 kHz - 3 MHz SW 3 - 30 MHz
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- Storage box with polystyrene interior
- Receiver L1662
- 4 × Mallory TR-134 mercury battery
- Earpiece with LEMO connector
- Antenna bracket
- Telescopic antenna
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© Crypto Museum. Created: Sunday 30 October 2022. Last changed: Monday, 31 October 2022 - 09:32 CET.
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