Archives for 2008

Debugging the RS232 serial port


Debugging Serial Communication FT1000MP Win-Test CW-Skimmer

In this article we will investigate how various Contest programms (Win-Test, N1MM and CW-Skimmer) communicate with the FT1000MP shortwave transceiver over the serial port. We will see what happens when multiple programs try to talk to the transceiver at the same time, what problems appear and how we can successfully monitor and debug them.

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Measuring ICE Bandpass Filter

ICE Bandpass filter with TAPR VNA

Today, I had the possibility to measure the performance of the well known ICE bandpass filters. Read more about the measurement results…

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Assembly & Measurement of a 3dB Splitter

3db Splitter

Lately I needed a 3dB splitter for a HF (1…30MHz) measurement project. Instead of buying me a splitter, I decided to build it on my own. After measuring the performance I am satisfied with the result…

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Presentation: SDR & Contesting


Last weekend I was invited hold a presentation about Software Defined Radio & Contesting at the Hamradio Convention in Friedrichshafen. Due to the high resonance I made the slides available on this website….

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Bandscope Modification Yaesu FT1000MP

Yaesu FT1000MP

In 2007 several SDR (Software Defined Radio) kits became available for Ham Radio purpose. Since most of these kits are just single band receivers, another easy solution was needed to benefit from the PC based Signal Processing on multiple bands. With the Yaesu FT1000MP, a full coverage short wave receiver was already available in the shack.  Why not reuse the already available hardware instead of spending money for a couple of additional monoband SDRs?

After studying the schematics of Yaesu’s FT1000MP it was decided to tap the IF (Intermediate Frequency) with an already available SDR-Kit.

This article documents the performed analysis and conducted work necessary to perform this modification.

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