Three years ago I added a Software Defined Radio (Softrock Clone) to the 455kHz intermediate frequency of my FT1000MP shortwave receiver. The idea was to use it as a spectrum scope in conjunction with CW Skimmer. Unfortunately the solution has one big disadvantage: I can’t use it with Win-Test my favorite Contest Software. In a detailed investigation I found out why CW Skimmer and Win-Test can not be used simultaneously with the same Radio. Now, about past 30 month later, the situation has improved. However there is still one little change necessary to finally be able to use CW Skimmer and Win-Test with (my) FT1000MP. Read in this article what has changed and what is still missing (my wish)!

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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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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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Author's picture

Tobias Wellnitz, DH1TW


Software Engineer

Germany