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Converting surplus radio equipment
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Over the past few years, a huge amount of surplus radio equipment has been
donated to the Museum by KPN Telecom (the major Dutch Telco operator). The
equipment may be sold to radio amateurs, in order to gain income for the
Museum. Transceivers and other transmitting devices may only be sold to
licenced radio amateurs. Most of the equipment is in good physical condition
and has been operational until phased out. The Museum beleives that this
system of selling surplus equipment serves many purposes: it grants the radios
a 2nd life, it generates income for the museum, it stimulates the radio hobby
and, what's more: it stimulates the DIY part of our hobby.
For most of the rigs described below, museum volunteers have created full
conversion instructions in the form of web pages, written documents, manuals,
PDFs, etc. In some cases we are even able to supply a full DIY conversion kit,
complete with all components needed to carry out the conversion. Below are
some links that may help you to find your way through the various descriptions
on this website.
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Contents of this page
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70-cm Repeater
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Some time ago, the musem acquired a large number of 70-cm repeaters
that had served for many years in data connections between our oil
platforms and the mainland. These rigs were manufactured to KPN specs
(Royal Dutch Telecom) by Dutch manufacturer Tripple-P and consist
mainly of European components. As these repeaters were used in the 70-cm
band, they can easily be converted for amateur use.
 More information about this 70-cm repeater
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Eriscsson F955
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These transceivers were originally used in the 2nd generation
mobile phone base stations of KPN Telecom, also known as the ATF-2 or NMT
network. Although these rigs are slightly older that the RS9044 (see below),
they are ideal for amateur purposes, especially because of the fact that
they consist mainly of discrete components (rather than SMD components
which might be difficult to handle).
More information about the Ericsson F955
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8801E-1 receiver for 70 cm
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A beautiful 70 cm receiver, consisting of the same building blocks
as the receiver of the Ericsson F955 (above). Not only very nice
for the serious ham, but also for the active listeners, as no licence is
required for this receiver.
More information about the 8801E-1 receiver
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AEG Teleport 9
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This is a solid and very robust portable transceiver for the 2 m band.
Visitors of the main Dutch airport (Schiphol in Amsterdam) may remember
these brick-size blue handies being used by all airport service personel.
The AEG Teleport 9 was part of a trunking network used by all services
at the airport and has now been replaced by a more modern (and smaller)
alternative. The old units ended up in the Museum's warehouse and have
been converted by Rob Spijker, PE1RJY, into amateur transceivers covering
the entire 2 m band, complete with repeater shifts, etc. In fact, most
of the conversion has been done in software only! Follow the link below
to visit our special Teleport 9 web pages, with full descriptions, manuals,
hints, tips, alignment information, etc.
More information about the Teleport 9
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Radio Systems RS9044
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A very modern transceiver used in some base stations of the ATF-2/NMT
mobile phone network of KPN Telecom, build by the Swedish company
Radio System. Hundereds of these rigs have found a new owner through
the Museum. Unfortunately this unit has been sold out completely, but
you may be able to obtain one from other surplus sources.
Read more about the RS9044
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Nokia Mobira
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The Nokia Mobira is one of the first 'portable' mobile phones that
were made available to radio amateurs one the ATF-2/NMT network was
dismantled. As the ATF network was operated in the 70 cm band, the
transceivers can easily be converted to the amateur frequencies.
We still have some of these units on sale, but unfortunately the
handsets are very difficult to obtain.
Read more about the Nokia Mobira
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Teletron T-813
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This 2m mobile transceiver was part of one of the most successful
projects of the Museum ever. The Teletron T-813 rigs had been used
extensively by the HTM (Public Transport of The Hague) for many years.
Many units have been sold to radio amateurs in The Netherlands
and it's still a very popular rig on 2nd hand and flea markets.
Due to the volume (over 5000 units sold by the Museum) various conversion
methods have been developed, ranging from packet radio and computer control
to a full conversion DIY kit, complete with an LCD display.
Read all about the Teletron T-813
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Bosch mobile radios
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The KF-161 is a rather old mobile transceiver, manufactured by the
German company Robert Bosch. Despite its age, it is a very popular
rig among radio amateurs, net least because of the fact that it is
completely build around conventional components. Two variants of the
KF-161 exist today: a Crystal driven one and one with a synthesizer.
More information about the Bosch KF-161
KF-161 for APRS use
The KF-163 transceiver
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Filters
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Most of the mobile phone base stations arrived at the Museum in
huge 19" racks. The systems consisted of transceivers, power supplies,
cables, filters, etc. As phone systems operate in full duplex,
it is important that the transmitter and the receiver can't 'see'
eacht other. In order to achieve this, advanced filters were used.
Some of these filters can be made to work in the 70cm amateur band
and may be used e.g. for repeaters and to increase the selectivity
of your receiver. Most filters that were originally available through
the Museum have been sold out now, but the information is retained here
for reference purposes.
An overview of the available filters
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Stackpipe RS136a
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The analogue mobile phone systems consited of a number of transceivers,
each operating on a different channel, linked together onto a single
antenna. Stackpipes were used to achieve such linking. Jeroen, PE9JBS,
found out the a stackpipe can also be used the other way around (to link
multiple antennas onto a single transceiver) and has described a method
to convert the stackpipe for amateur use.
More information about the stackpipe
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Power Supply RS910
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When dismantling the ATF-2/NMT 19" racks, a number of high quality
24V power supplies have become available. Most of these PSUs have
been sold to radio amateurs and are now used in amateur shacks.
Joost Vossen, PE2JVS, explains how to convert this switched mode
power supply to 12V.
Converting the RS910 to 12 Volt
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Power Supply RS9132
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At the amateur radio flea market in Rosmalen (Netherlands) in 1999,
a large number of RS9132 switched mode power supplies were sold.
Joost Vossen, PE2JVS, describes how this PSU can be converted for
12 and/or 14V.
Converting the RS9132 power supply
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The warehouse
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A lot of the KPN surplus equipment came in as fully assembled
mobile phone base stations. Many 19" racks, loaded with high-end
radio equipment, arrived at a time when the Museum was far too small
to store it all. Even the curator's garage had been taken as a result of previous
shipments. Finally, an alternative location was found only a few
hundred meters from the Museum. Follow the link below to have a
quick look in our warehouse.
Sneak into our warehouse
Various other surplus stuff
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