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← FS-5000 Batteries
Non-rechargeable LiMnO2 battery pack
The BPU-7000 was a non-rechargeable battery pack for the Telefunken
HRM-7000 manpack radio. It was manufactured
by Telefunken System Technik (TST) and consisted of LiMnO2
battery cells. The battery unit would normally be mounted to the rear
of the HRM-7000 radio station
[2].
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The battery consists of a die-cast aluminium body, that is molded
in such a way that it can be used as an integral part of the HRM-7000.
It has a 3-pin connector that automatically mates with the radio as soon as
the battery is put in place.
A self-restoring fuse protects the battery against short-circuits.
When the battery is exhausted is has to be fully discharged and then
recycled.
As this battery was produced in large quantities, it was also used by
the German Special Forces (Fernspäher) with the FS-5000M field station,
as an alternative for the standard NiCd batteries.
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For this purpose a special cable
was supplied that allowed the BPU-7000
to be connected
to the leftmost battery socket of the transmitter.
Five black plastic Velcro dots
are affixed to both the transmitter and the battery pack,
in such a way that the battery can be fitted upside-down on top of the
transmitter. The cable then connects the battery
to the leftmost battery socket.
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The application of the BPU-7000 battery and the special cable
was suggested in the FS-5000M manual [3] as an alternative to the
standard station battery.
Although this may look like a professional
solution, in practice it is quite clumsy. Both connectors easily
come loose.
The image on the right shows the FS-5000M configured for use by
German Special Forces. The battery is fitted on top of the transmitter,
whilst the receiver is mounted at the front.
In this mode, the DSU is detached
and is connected to the receiver
via the optional VK-5000 cable.
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In practice, the battery cable was held in place by a short canvas strap
around the assembly.
The complete station was probably carried on the body by SF-personnel
in a suitable back pack, with the DSU carried in the hand or on the chest.
As the battery has a capacity of 20Ah, and the FS-5000 sends digital messages
as extremely short burst (< 0.8 sec), it is sufficient for many hours of
use, before the battery has to be replaced. The empty battery then has to
be recycled.
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A more suitable battery, also based on LiMnO2 technology,
was developed by Telefunken, a few years after the FS-5000 was introduced.
It is shown in the image on the right.
It is currently unknown whether this type of battery was ever produced
in large quantities, but it seems likely that it never got passed the
prototype stage, as it was too expensive for the relatively small FS-5000
market at the time [1].
➤ More information
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© Crypto Museum. Created: Friday 20 August 2010. Last changed: Monday, 25 February 2019 - 21:23 CET.
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