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Bosch KF161 The Bosch KF161 is a very populair rig and many of these units have been sold by the Museum to radio amateurs over the past few years. Two variants of the KF161 exist: one with a crystal oscillator and a synthesizer operated one. Both versions are now completely sold out. The christal version can be very useful for APRS use.      Download Explaination of the synthesizer in Word format 28K DOC file Marc, PE1RRT, explains exactly how the synthesizer of the Bosch KF161 Dig-X works. (28 KB) Explaination of the synthesizer in PDF-formaat 15K PDF file This is the same story as in the above link, albeit in the populair PDF format, so that it can be viewed by users of alternative operating systems as well. (14 KB) Circuit diagram of the Peiker microphone 6K ZIP file This is the circuit diagram of the LF pre-amplifier found in most Peiker microphones. It is a BMP image in a ZIP archive. (6 KB) Links KF-161 Tracker Convert your KF-161 into an APRS station with this TinyTrak-alike APRS tracker. 10 Channel conversion Full conversion instructions by PE1RRT, PE1OLQ and PE1MIX to make 10 channels in the 2m band available, using an EPROM. 40 channel conversion Building on the above conversion, PA0PDO has used the two tone keys at the front to create 4 banks of 10 channels each. KF161 for APRS use This variant of the KF161 has no buttons or control at its front panel. Instead it is equipped with a crystal for the international APRS frequency 144.800 MHz. Web enabled KF161 A beatiful website by PA3BYA, showing full control if a KF161 over Internet. KF161 conversion with a 68GC11, by PA3BYA Hints and tips Some useful remarks by Geert-Jan, PE1HZG, that can be of use when repairing and adjusting the KF161. KF161 forum on Yahoo This discussion group is used by radio amateurs who are active with the Bosch KF161. Polish site about KF161 for APRS

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