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Converting surplus radio equipment
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.
 
Contents of this page

70-cm Repeater
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
 
Eriscsson F955
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
 
8801E-1 receiver for 70 cm
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
 
AEG Teleport 9
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
 
Radio Systems RS9044
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
 
Nokia Mobira
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
 
Teletron T-813
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
 
Bosch mobile radios
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
 
Filters
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
 
Stackpipe RS136a
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. Jessica, 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
 
Power Supply RS910
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
 
Power Supply RS9132
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
 
The warehouse
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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